^^^ MOLLUSCA. 



Sepia, Lam, 

 The Sepise, properly so called, have the two long arms of a Loli- 

 go, and a fleshy fin extending along the whole length of each side of 

 the sac The shell is oval, thick, convex, and composed of nume- 

 rous and parallel calcareous laminae, united by thousands of little 

 hollow columns, running perpendicularly from one to the other. 

 This structure rendering it friable, causes it to be employed for po- 

 lishing various kinds of work; it is also given to birds in aviaries, 

 tor the purpose of whetting their beaks. 



The ink-pouch of the Sepiae is detached from the liver and situ- 

 ated more deeply in the abdomen. The glands of the oviducts are 

 enormous. The eggs are produced attached to each other in branch- 

 ing clusters resembling those of grapes, and are commonly termed 

 seu'grapes. 



The species most commonly found in the seas of Europe, 

 Sepia officinalis, U; Rondel., 498, Seb., Ill, iii, attains the 

 length of a foot and more. Its skin is smooth, whitish, and 

 dotted with red. 



The Indian Ocean produces another. Sepia tuberculata. Lam 

 Soc. d'Hist. Nat., 4to, pi. i, f. i(i). 



Nautilus, Lin. 

 In this genus Linnsus united all spiral, symmetrical and chambered 

 shells, that IS to say such as are divided by septa into several cavi- 

 ties; their inhabitants he supposed to be Cephalopoda. One of them, 

 in fact, belongs to a Cephalopode that strongly resembles a Sepia 

 but It has shorter arms it forms the genus, 



Spirula, Lam. 

 ^ In the hind part of the body, which is that of a Sepia, is an inte- 

 rior shell, which, although very diff-erent from the bone of that ani 

 mal as to figure, differs but little in its formation. A correct idea 

 of the latter may be obtained by imagining the successive lamina, 

 instead of remaming parallel and approximated, to be concave to- 

 wards the body, more distant, increasing but little in breadth, and 



TEHA Deshayes. See my note on this subject, Ann. des Sc. Nat. II, xx 1 2 

 to i^ZZl Ze?' Tr'^' petrified-Fossils, which appear to b^ clJse;^ allied 

 cs ac. jNat., 11, 485, and pi. xxii, and of Orbigny, lb., pi. vi. 



