4thly. The ink-bag, and its inspissated fluid, sepia; (Bd. pl. 44′, figs. 7, 9.)
Lign. 143. The structure of the sherry parts of the Belemnites Puzosianus.
Oxford Clay. Christian Malford. (1/4 nat. size.)
| a, a. The dorsal basilar processes of the phragmocone. |
| b, b. Upward extension of the attenuated osselet. |
| c. Siphunculus. |
| d. Phragmocone: the transverse lines indicate the septa. |
| e. The capsule or outer investment of the guard. |
| f. The distal part of the phragmocone. |
| g. The alveolus or cavity in the guard. |
| h. Vertical section of the guard. |
| i. The solid part of the rostrum or guard. |
| k. The sulcus or groove on the ventral aspect of the rostrum. |
| l. Shows the continuation of the capsule, in section, continued from e. |
| m. Diverging parallel striæ observable between the dorsal processes of the phragmocone. |
| n. Transverse section of half the diameter of the radiated structure. |
Lign. 144. Very perfect specimen of Belemnites Puzosianus.
Oxford Clay. Christian Malford, Wilts. (1/6 nat. size.)