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4. Transverse section of another Coprolite from Lyme, showing the internal foldings of the plate, with sections of scales of fishes embedded in it. 5. Exterior of a spiral Coprolite, from the Chalk Marl, near Lewes, showing folds and vascular impressions analogous to those in No. 3. 6. Longitudinal section of another Coprolite, from the same Chalk Marl, showing the spiral manner in which the plate was folded round itself. 7. Exterior of another spiral Coprolite, from the Chalk at Lewes, showing vascular impressions on its surface, and the transverse fracture of the spiral fold at b. In many other figures of Plate 15, a similar abrupt termination of the coiled plate is visible at b. 8, 9. Two other small species of spiral Coprolites in chalk; these as well as Figs. 5, 6, 7, are probably derived from fishes found with them in the chalk, near Lewes. 10, 11, 12. Coprolites from the Lias at Lyme, exhibiting well-defined characters of the spiral sold, with vascular impressions on their surface. 13. Similar appearances on a Coprolite found by Dr. Morton in the Greensand of Virginia. 14. Coprolite from the Lias at Lyme, bearing strong corrugations, the result of muscular pressure received from the intestines. 15. Transverse section, showing the abrupt termination of the folded plate in Fig. 14, and representing the flattened form of the spiral intestine. J6. Longitudinal section of the intestinal tube of a recent Shark, showing the spiral valve that winds round its interior, in the form of an Archimedes screw; a similar spiral disposition of the interior is found in intestines of Dog-Fishes, Figs. 1 and 2.

Explanation of PLATEs 15'. 16. 17. 18. 29

17. Coprolite from Lyme, containing large scales of Dapedium politum.

18. Coprolite from the Lias at Lyme, containing undigested bones of a small Ichthyosaurus.

PLATE 15'. W. I. p. 156. Cololite, or petrified intestines of a fossil fish from Solenhofen. (Goldfuss.)

PLATE 16. V. I. p. 157.

1. Conjectural Restoration of the Skeleton of Plesiosaurus dolichodeirus. (Conybeare.)

2. Skeleton of Plesiosaurus dolichodeirus, in the British Museum, from the Lias at Lyme Regis. (Scharf. Original.)

PLATE 17. V. I. p. 158.

A nearly entire and unique skeleton of Plesiosaurus dolichodeirus, 5 feet 7 inches long, from the Lias of Street, near Glastonbury. This skeleton forms part of the splendid series of fossil Saurians, purchased for the British Museum, from T. Hawkins, Esq. in 1834. See V. I. p. 162, and Note. (Hawkins.)

PLATE 18. W. I. p. 160, Note.

1. Under jaw of Plesiosaurus dolichodeirus, forming part of the series last mentioned. (Original.) 2. Head of the Plesiosaurus, figured in Pl. 16. Fig. 2. seen from beneath. (Original.) 3. Ventral portion of the ribs of the Plesiosaurus, figured in Pl. 17. See W. I. p. 162. (Original.) a. c. Central bones forming the crown of the sterno-costal arch. b. triple series of intermediate bones between the central bones, a. c. and the true ribs, d. d. e. e. lower extremity of coracoid bones.

PLATE 19. W. I. p. 160.

Fig. 1. A beautiful specimen of Plesiosaurus macrocephalus hitherto undescribed, found in the Lias marl at Lyme Regis, by Miss Anning, and now in the collection of Lord Cole. (Original) On comparing this figure with those of P. Dolichodeirus at Pl. 16, 17. The following differences are obvious: 1. The head is very much larger and longer, being nearly one-half the length of the neck. 2. The vertebrae of the neck are thicker and stronger in proportion to the greater weight they had to sustain. 3. The hatchet-shaped bones differ in form and size, as may be seen by comparing them with those of P. dolichodeirus. Pl. 19. Fig. 2. and Pl. 17. 4. The bones of the arm and thigh are shorter and stronger than in P. Dolichodeirus, and corresponding differences may be traced throughout the smaller bones of the Paddles; the general adjustment of all the proportions being calculated to produce greater strength in the P. Macrocephalus, than in the more slender limbs of P. Dolichodeirus. These differences are not the effect of age; as the two specimens, from which they are here described, are nearly of the same length. Fig. 2. Hatchet-shaped bones of the neck of Plesiosaurus Dolichodeirus, copied from the specimen figured in Pl. 17. 3. Anterior extremity of an insulated lower Jaw of Plesiosaurus, from the Lias at Lyme Regis, in the British Museum, part of the collection of Mr. Hawkins. V. I. p. 160. Note. (Original.) 4. The entire bone, of which Fig. 3. forms part, reduced to a small scale.

ExPLANATION of PLATES 20. 21. 22. 31

PLATE 20. V. I. p. 167.

Head of the Mosasaurus, or Great Animal of Maestricht. (Cuvier.)

PLATE 21. V. I. p. 171.

Pterodactylus longirostris in the lithographic slate of Aichstedt. (Cuvier and Goldfuss.) In this Plate, and Plate 22, the same letters and figures designate the corresponding Bones in the different Animals to which they are affixed; they are copied chiefly from the figure and Explanations of Dr. Goldfuss, in his Beitrage zur Kenntniss verschiedener Reptilien der Worwelt. . Cavitas narium. . Cavitas intermedia. . Orbita. . Maxilla superior. Velos nasi vel inter-maxillare? . Operculum nasale. Autos frontis anterius vel nasale 7 . Os frontis proprium. . Os parietale. . Os petrosum. . Pars basilaris ossis occipitis. Pars lateralis. Os tympanicum s. quadratum. Os frontis posterius. Os mastoideum. Os zygomaticum. . Autos lacrymale vel superciliare ? . Annulus orbitalis. . Corpus ossis sphenoidei. p. Processus transversus ossis sphenoidei.

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. Os pterygoideum.

Os transversum.

Os palatinum. . Processus palatinus maxillae superioris. . Pars angularis inferior maxillae inferioris. . Pars angularis superior.

. Pars condyloidea. . Pars complementaria, Cuv. (coronalis, auctor.)

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I.

II.

III–VII. VIII—XXII. XXIII. XXIV. XXV. XXVI. XXVII. XXVIII. 1—15.

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

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35–38.

Atlas.
Epistropheus.
Vertebrae colli.
Vertebrae dorsi.
Vertebrae lumborum.
Os sacrum.
Ossa coccygea.
Sternum.

Costae.

Scapula.
Os coracoideum.
Ilium.

Os pubis.
Os ischium.
Humerus.

Ulna.

Radius.

Carpus.
Os metarcarpi primum s. pollicis.
O. m. secundum.
O. m. tertium.
O. m. quartum.
O. m. quintum.
Phalanges.
Ph. indicis.
Ph. digiti medii.

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