A. E. Terrill — North American Cephalopoda. 
357 
sexes, by the T7. S. Fish Commission, in 1880, off Newport, R. L, in 
155 to 372 fathoms; and in November, 1880, by Lieut. Z. L. Tanner, 
on the “Fish Hawk,” off the mouth of Chesapeake Bay, in 157 fath- 
oms. It was taken by Mr. Agassiz, on the “Blake,” in 233-260 
fathoms, and as far south as lat. 32° 33' 15". 
This species very closely resembles the Rossi a glaucopis Loven, 
of Northern Europe, as figured by G. O. Sars. The latter is, how- 
ever, more papillose, and has smaller eyes and head, if correctly 
figured. 
HETEROTEUTHIS Gray. 
Heteroteuthis (sub-genus) Gray. Catal. Moll. Brit. Mus.. i, p. 90. 1849. 
The body is short, thick, rounded posteriorly. Fins large, with 
narrower bases, attached near the middle of the sides of the mantle. 
Head and eyes large. Anterior border of the mantle-edge free, dor- 
sally. Connective cartilages on the base of the siphon, with an ovate 
pit; lateral cartilages of mantle, simple, longitudinal ridges. Pen 
much shorter than the mantle, narrow anteriorly; posterior blade 
small, slightly expanded laterally. Club of the tentacular arms well 
developed, with numerous suckers, in about eight rows, those in the 
lower marginal rows decidedly larger than the rest ; rims of the suck- 
ers with smooth edges ; the membranous edge of the aperture is 
denticulated by small, acute scales. Middle suckers of the lateral 
and ventral arms distinctly larger in the female ; in the male abruptly 
very much larger than on the others; these suckers are deep, with a 
small, round, smooth rim, and with a raised zone around the middle. 
In the male the left dorsal arm is hectocotylized by having much 
smaller and more numerous suckers, arranged in four rows, and by 
the development of the marginal membrane. 
Heteroteuthis tenera Terrill. 
Amer. Jour. Set, xx, p. 392, November, 1880; Proc. Nat. Mus., iii, p. 360, 1880 ; 
Bull. Mus. Comp. Zool., viii, p. 103, pi. 3, figs. 5-55, pi. 8. figs. 2-2d, 3-36, 1881. 
Plate XLVI. figures 2-2 d, 3-36. Plate XLTII, figures 5-56. 
A small and delicate species, very soft, translucent, and delicately 
colored when living. 
Body short, cylindrical, scarcely twice as long as broad, posteriorly; 
usually round, but in strongly contracted, preserved specimens, often 
narrowed and even obtusely pointed ; front edge of mantle sometimes 
with a slight dorsal angle, in most cases emarginate. Fins very 
large, thin, longer than broad, the outer edge broadly rounded, the 
