Fig. l. Fossil Loligo from Lias at Lyme, in the collection of Miss Philpot, exhibiting nearly the same structure as figs. 6. 7. at Pl. 28. and containing beneath the pen, a very large Ink bag, D. The greater proportionate size of this Ink bag indicates a difference in species from fig. 3. (Mrs. Buckland. Original.)

Fig 2. Loligo Aalensis from Lyme Regis shewing the under surface or concave side, and the duct of the Ink bag distended with Ink. A.A. Barbs or filaments of the Pen; B.B. Marginal bands; C. Axis of Shaft; D. Duct of Ink bag. (Mrs. Buckland. Original.)

The wavy lines here seen between the Ink bag and the apex of the Pen, are the inferior terminations of the successive laminæ of growth; each [051] larger and superior Plate overlapping the edges of the next subjacent and smaller plate. These edges are rendered more irregular by decomposition.

d'. Magnified representation of very minute curved lines passing from the marginal band across the shaft, at d.

e. Thin lamina of the white pulverulent substance of a decomposed Plate; it retains partial traces of the transverse wavy fibres.

f. Minute perpendicular filaments prevailing over the transverse fibres of the shaft.

Fig. 3. Fossil Loligo from Lyme Regis, shewing the same structure as the preceding figures, in the several portions of the Pen that are preserved; and having its Ink bag distended nearly in its natural shape and place beneath the Pen. (Original.)

C. C. Axis of the shaft.

Figs. 4. 5. 6. 7. 8. 9. Fossil Ink bags from Lyme Regis. The membranous sacs and excretory ducts are still preserved, and closely resemble those of a recent Ink bag; see Pl. 28. fig. 5. (Original.)

Fig. 10. Fossil ink bag found by Miss Anning in the Lias near Watchet, Somerset. (Original.)