« AnteriorContinuar »
EXPLANATION OF PLATE 45. 71
the circular lines on the surface of its horny membrane d, are lines of growth. (Original.) Fig. 3. Belemno-sepia from the Lias at Lyme, in the Oxford Museum; the Ink-bag is preserved entire within the anterior conical sheath e. e. e. ; the greater part of this sheath is highly nacreous, in a few places (d.) it is horny. (Original.) Fig. 4. Large Ink-bag from the Lias at Lyme, in the collection of Mrs. Murchison, bearing on its surface undulating lines of growth similar to those on the surface of Fig. 1. The Ink is exposed at c. c.; in other parts it is surrounded by the sheath, e. e. e. Nearly one-half of this sheath retains the appearance of horn, whilst the other half is highly nacreous. This interchange of condition, from horn to brilliant nacre, occurs in almost every specimen from the Lias at Lyme, in which the Ink-bag is accompanied only by the flexible anterior sheath, and the calcareous sheath has perished. (Original.) Figs. 188.8.131.52. Ink-bags from the Lias at Lyme, partially surrounded by brilliant nacre. In no one of the specimens represented in Pl. 44" is the least trace of the calcareous sheath of the Belemnite preserved. See V. I. p. 283, Note. (Original.)
Fig. 1. Limulus Americanus (Leach,) a young specimen from Honduras, one-third of nat. size. b'. Right compound Eye magnified. b”. Two single
* The following letters are applied in Pl. 45 and Pl. 46, to corresponding parts of different animals. a. the shield; a'. lateral portion of the shield; b. the eye; b. eye magnified; b.". frontal eyes; c. the back; d. the tail; e. branchiae.
Eyes in front of the shield. See V.I. p. 297. (Original.) Fig. 2. View of the under surface of Fig. 1, showing the crustaceous legs beneath the shield (a,) and the swimming feet bearing the Branchiae (e,) beneath the body (c.) Scale, one-seventh of nat. size. Fig. 2. e. Swimming feet, (see Fig. 2 e,) enlarged to the scale of Fig. 1. Fig. 2. e". Posterior surface of one of the swimming feet, bearing the fibres of the Branchiae. (Original.) Fig. 3. Front view of magnified figure of Branchipus stagnalis. 3. b. The left eye mounted on a peduncle. 3. b'. The right eye still more magnified. (Original) Fig. 4. Side view of Branchipus stagnalis, nat. size. Fig. 5. Magnified view of the back of Branchipus stagnalis. See V.I. p. 298. (Original.) Fig. 6. View of the back of a Serolis from Senegal, given by M. Dufresne to Dr. Leach. See V. I. p. 296. (Original.) Fig. 7. View of the under surface of Fig. 6, showing the union of crustaceous legs with the membranous branchiae, e.” (Original.) Fig. 8. Magnified view of the Branchiae at Fig. 7, e. Fig. 9. Back of Asaphus caudatus, from Dudley, in the collection of Mr. Stokes. (Original.) Fig. 10. Side view of the left Eye of Fig. 9, is magnified. Fig. 10'. Another Eye of Asaphus caudatus, in the collection of Mr. Bright, from the W. side of Malvern Hill. In the front of this fossil are circular depressions on the stone, from which the petrified lenses have fallen out; on each side, the lenses remain in their natural place. (Original.)
* Figs. 3, 5, 6 and 7, are from original drawings by Mr. Curtis in the collection of Mr. C. Stokes.
Explan ATION of PLATE 46. 73
11. Anterior segment of the left Eye of Fig. 9, still
Plate 46. V. I. p. 294 et seq.
Figs. 1. 2. 3. Calymene Blumenbachii, from the Tran
sition Limestone of Dudley. a. The shield cover-
shell, in this position, must have given perfect pro-
Plate 46. V. I. p. 306.
1. Back of a fossil Scorpion of a new genus (Cyclophthalmus) found by Count Sternberg in the Coal formation of Bohemia, in a quarry of sandy
Explan Ation of PLATE 46". 75
argillaceous Schist, sufficiently hard to be used for
Even the skin, hairs, and pores of the tracheae of
this animal are preserved. In the same stone are many carbonized fragments of Vegetables, and on the right of the body is a large fossil Nut (a); this side of the animal has been laid open by cutting away the stone. (Sternberg.) 2. Lower surface of the same animal, discovered in split
ting the stone in search of fossil Plants; nat. size.
the tail of another and larger Scorpion. (See Pl. 46", Fig. 13.) We have here also the side of the same nut that is seen in Fig. 1. a. This trifid nut exhibits traces of the structure of the outer coating in which it was inclosed. (Sternberg.) 3. Magnified representation of the Head and Eyes. See W. I. p. 307. (Sternberg.) 4. Magnified jaw, armed with teeth, and partially covered with minute hairs. (Sternberg.) 5. Hairs on Fig. 4, highly magnifed. (Sternberg.) 6. Magnified representation of a portion of the skin, consisting of two divisible layers. See W. I. p. 308. (Sternberg.) 7. Magnified impressions of muscular fibres connected with the legs. (Sternberg.)
PLATE 46". W. I. p. 308.
Fossil Insects, Arachnidans, and Limulus.
The following description of the Insects represented in this Plate is founded on information received from Mr. Curtis and Mr. Samouelle.