12 CLASS CEPHALOPODA. 
oviducts are enormous. The eggs are produced attached to 
each other in branching clusters, resembling those of grapes, 
and are commonly termed sea grapes. 
The species most commonly found in the seas of Europe, 
Sepia officinalis, L.; Rondel, 498 ; Seb. III. iii., attains the 
length of a foot or more. Its skin is smooth, whitish, and 
dotted with red. 
The Indian Ocean produces another, Sepia tuberculata, 
Lam. Soc. d’Hist. Nat. 4to. pl. i. f. 1. 
NAUTILUS, Lin. 
In this genus Linnezus united all spiral, symmetrical, and 
chambered shells, that is to say, such as are divided by septa 
into several cavities; their inhabitants he supposed to be 
cephalopoda. One of them really does belong to a cephalopod 
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 
interior shell, which, although very different from the bone 
of that animal as to figure, differs but little in its formation. 
A correct idea of the latter may be obtained by imagining the 
successive lamine, instead of remaining parallel and approxi- 
mated, to be concave towards the body, more distant, increas- 
ing little in breadth, and forming an angle between them, thus 
producing an elongated cone, spirally convoluted in one plane, 
and divided transversely into chambers. Such is the shell of 
the spirula, which has additional chambers, consisting of a 
single hollow column that occupies the internal side of each 
chamber, continuing its tube with those of the other chambers 
to the very extremity of the shell. This column is termed the 
siphon. 'The turns of the spire do not come into contact. 
But a single species, Nautilus spirula, L.; List. 550-2, is 
known. The 
