84 DR. R. E. GRANT ON THE ANATOMY OF SEPIOLA VULGARIS, 
The ovarium' is intimately united to the lower extremity of the first stomach, and 
occupies the base of the sac. It consists of a thin membranous cavity, of an oval form, 
filled with clusters of ova hanging from its upper part. The ova? exist in all stages of 
development within the same ovariwm: the smallest are white, round and opaque ; the 
largest, filled with a gelatinous substance which projects from the open extremities, 
exhibit the same reticulate white markings on the surface which we observe in Sepia 
and other large Cephalopods. All the ova are attached to the extremities of ramified 
peduncles, till they are ready to pass out through the oviducts. The glands of the ovi- 
ducts? lie above and before the ovary, and have here a rose-red colour, the usual lami- 
nated structure, and a deep sulcus passing up along their anterior and posterior sur- 
faces, almost dividing them into two parts. They are broad and rounded at their lower 
extremity next the ovarium, and become much narrower at their upper end: they are 
proportionally very large in this animal, and receive large arteries from near the origin 
of the ventral aorta. In the female of this animal there is another glandular organ of 
a crescentic form and opaque yellow colour, lying between the bases of the glands of 
the oviducts, and which appears to communicate with a rose-coloured sac between the 
upper extremities of the oviducts, containing numerous small convoluted ceca. In 
the male, which is comparatively rare, the testicle‘, of a light purple colour, and lying 
at the bottom of the cavity of the mantle, as the ovary of the female, consists of innu- 
merable minute glandular ceca, contained in a loose sac, which sends out a vas deferens 
to a wide convoluted epididymis. This terminates in a slender lengthened tubular penis ° 
on the left side, which appears to possess minute appendices at its termination, like the 
rectum, 
Thus the Sepiola, the minutest of the Naked Cephalopods, possesses a structure as 
complex and elaborate as that of the largest Octopus or Loligo. By the magnitude of 
its cephalic arms, and their numerous large pedunculated suckers, it compensates for 
the want of developed suckers on its long tentacula. By the great development of its 
ink gland, and the magnitude of its organs of vision, it compensates for the want of 
more solid means of protection. The rounded form of its body required the dorsal 
lamina to be shortened, which would have impeded the motions of the mantle had it ex- 
tended, as in Loligo, to its extremity. The great muscular strength of its dorsal fins, and 
the mobility of their scapule, give rapid and varied motion to this delicate and defence- 
less animal; and they constitute the most perfectly developed arms of this class. Its 
organs of secretion are all largely developed,—its salivary, hepatic, pancreatic, and ink 
glands. Its digestive, circulating, and respiratory organs are constructed according to 
the most perfect form of the cephalopodic type; and the great development of its gene- 
rative apparatus is well adapted to repair the rapid destruction of its race. 
A very large specimen of Sepiola, from the coast of the Mauritius', was lately sent to 
the Zoological Society by Charles Telfair, Esq., the most active of our valuable cor- 
1 Fig. 10. ¢. 2 Fig. 12. 3 Fig. 10. d. d. 4 Fig. 11. a. 5 Fig. 11. d. 
