i a 
CEPHALOPODA. 481 
longitudints corporis superans, rhomboidalis, acutangularis, latior quam 
longa: sipho pyriformis, arcuatus: caput breve, latum, supra con- 
verum, infra excavatum : oculi parvi: brachit sessiles robusti, trique- 
tri, subequales, pro longitudine 2, 3, 4,1, trientem proxzimum paris 
infertoris acetabulis privatum vel fimbriatum ; acetabulis parium late- 
ralum maporibus : brachii tentaculares graciles, vix ad extremitatem 
dilatati, ad trientes duos extremos acetabulis instructi: color (vino con- 
servata) rufo-cinerea. 
Body large, subcylindrical, tapering backwards; fin more than one- 
third the length of the body, rhomboidal, one-third broader than long, 
acutangular ; anterior of body obliquely truncate, with a slight median 
angle above. Siphon pyriform; aperture curving simply downward. 
Eyes small, naked; head short and broad, convex above and excavated 
beneath for the reception of the siphon. Colour drab, almost destitute 
of dots, darker along the back. Sessile arms robust, triquetrous, of 
nearly equal length, about twice as long as the head, ranking 2, 3, 4, 1. 
The lower pair for one-third their length are destitute of cupules, and 
fimbriated with a double range of compressed, adnate lobules, of which 
the exterior is longest; the remaining two-thirds with a double row 
of small, alternating cupules; the upper pair has similar cupules, and 
all have them commence at the base; the two lateral pairs have the 
cupules along the middle very large (one-eighth inch), on long, eccen- 
tric pedicles ; the tips of all of them are furnished with minute cupules, 
on long, threadlike pedicles, dilated at base. The tentacular arms are 
a third longer than the lateral, triquetrous at base, slender and com- 
pressed throughout, scarcely dilated towards tip ; cupules commencing 
at the lower third in a double series, small, when past the middle they 
become very large (six on each side,) alternating with small ones; the 
large tentacular cupules have a circle, with about fifteen teeth, of a 
metallic copper hue; the small ones, and those of the sessile arms, 
have a half circle of eight points. Mouth small, the surrounding mem- 
brane without cupules, with a process between the upper pair of arms, 
and one to each of the other arms. 
SHELL slender, diamond-pointed in front, about half an inch broad 
and eight and a half inches long, tapering backwards regularly, the 
posterior two inches, dilated into a paddle-shaped blade, in which 
the different lamine converge to the point. 
121 
