SOME NEW AND RARE CEPHALOPODA. 109 
The specimens now present numerous spots of a deep purplish brown colour ; according 
to the number and aggregation of which, the skin is darker or lighter. They occur in 
greatest number on the back part of the head and trunk ; are wanting on the fins, and 
on the under surface of the third and fourth pair of arms; and are very sparingly dis- 
tributed on the under part of the head and mantle, which are consequently of a light 
colour: the most remarkable disposition of the dark pigment is that which the inner 
surface of the Ist, 2nd, and 3rd pair of arms presents in the interspace of the suckers, 
where it is disposed in broad, irregularly shaped, transverse stripes, corresponding to 
each pair of suckers. 
As the dimensions of the arms, tentacles, head, body and fins, are accurately repre- 
sented in the figures (PI. XXI. figg. 6 & 7.) subjoined, which is taken from the largest 
of the four specimens, they need not here be detailed. 
The head is slightly compressed, but broad ; supporting anteriorly, arms which are 
relatively longer than in the Calamaries generally, the second and third pair being 
nearly equal to the trunk in length. Liaterally the head Supports a pair of large and 
well-developed eyes. ‘The orifice in the integument leading to the capsule of the eye is 
spherical, proportionally large, as in Loligo vulgaris, and in the axis of vision: the 
sclerotica is perforated by a smaller aperture immediately behind the preceding, so that 
the capsule of the lens is immediately exposed to the external surrounding medium ; the 
lens is proportionally small, but attached to the ciliary body as in the Sepia: the pig- 
mentum appeared to be disposed in thick detached portions ; it was lined anteriorly by 
an opake white substance, which I conceive to be the true retina, although the prin- 
cipal expansion of the optic filaments is posterior to the pigment. The hyaloid mem- 
brane was, as usual in this class, a strong and very distinct transparent coat. 
The body of the Lol. laticeps is subcylindrical and conical, gradually diminishing in 
circumference till it terminates in a point at the posterior margin of the fins, which do 
not extend conjoined together beyond this part, as in the Cranchia. The anterior margin 
of the mantle is free in the whole of its circumference, as in the rest of the genus Loligo. 
The muscles which connect the head to it posteriorly have their origins extended along a 
pair of approximate cartilaginous styles placed at the back of the neck : the anterior 
part of the mantle is secured by the two strong pillars of the funnel. 
On the inner surface of the mantle at its ventro-lateral aspects, are situated the two 
elongated cartilaginous ridges, which are articulated, as in other Loligines, to cavities 
of a corresponding form at the sides of the base of the funnel. The interior of the funnel 
is provided with the usual valve, attached at the dorsal aspect of the canal. Two thin 
membranes extend from the head to the back part of the funnel. The terminal orifice 
of the funnel is oblique, but not to the same extent as in Cranchia scabra: in all the spe- 
cimens I found four large spots of pigment arranged transversely below this orifice. 
The fins are terminal and dorsal ; a space of about 1 a line intervenes between their ori- 
gin anteriorly, whence their bases converge and are united at the apex of the trunk ; 
