A. E. Verrill — North American Cephalopods. 357 



sexes, by the U. S. Fish Commission, in 1880, off Newport, R. I., 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 JRossia glaucopis Loven, 

 of Northern Europe, as figured by G. O. Sars. The latter is, how- 

 ever, more ])apillose, 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 Verriii. 



Amer. Jour. Sci., xx, p. 392, November, 1880; Proc. Nat. Mus., iii, p. 360, 1880 ; 

 Bull. Mus. Comp. ZooL, viii, p. 103, pi. 3, figs. 5-56, pi. 8, figs. 2-2d, 3-3&, 1881. 



Plate XLVI, figures 2-2c?, 3-3&. Plate XLVII, figures 5-56. 



A small and delicate species, very soft, translucent, and delicately 

 colored when living. 



Body short, cylindrical, scarcely tAvice 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 



