A. E. Yerrill — North American Cephalopods. 295 



CalliteuthiS YerriU. 

 Amer. Journ. Sci., xx, p. 393, for Nov., 1880 (published Oct. 25); Proc. Nat. Mus., 

 iii, p. 362, 1880. 



Body short, tapering to a small free tip; fins small, united behind 

 the tip of tlie body. Siphon united to the head by a pair of dorsal 

 bands; not sunken in a furrow; an internal valve. Mantle united to 

 the sides of the siphon by simple, linear, longitudinal lateral ridges, 

 corresponding with connective cartilages on the sides of the siphon, 

 which are long-ovate, with a raised margin all around. A dorsal 

 elongated connective cartilage on the neck, opposite the pen. Arms 

 long, not webbed ; suckers in two rows, largest on the middle of the 

 lateral and dorsal arms ; horny rings of suckers smooth on most of 

 the suckers, simply dentate on the distal ones. Eyes large, with 

 rounded openings and thin, free lids. Buccal membrane simple, sack- 

 like, with seven connective bridles. Internal anatomy of the female 

 similar to that of Ommastrephes. Oviducts and nidamental glands 

 symmetrically developed on the two sides. Oviducts opening in front 

 of the bases of the gills, the openings simple, long, narrow, oblique. 

 Two long, ligulate nidamental glands, with acute anterior ends, lie, 

 side by side, and a little apart, on the middle of the visceral mass, 

 behind and over the heart; each of these consists of two halves, 

 folded together, and covered on the inner surface with fine transverse 

 laminfB ; the space between them opens along the outer edge. 



CalliteuthiS reversa Verriii. 



Amer. Journ. Sci., xx, p. 393, Nov., 1880 ; Proc. Nat. Mus., iii, p. 362, Dec, 1880, 

 Plate XL VI, figures 1-16. 



Body rather short, tapering backw^ard, subacute posteriorly; front 

 edge of mantle advancing somewhat in the middle, and forming an 

 obtuse angle ; considerably emarginate beneath. Caudal fin small, 

 short, thin, each half nearly semicircular, attached subdoi-sally, pos- 

 terior end emarginate and free from the tip of the body, but not ex- 

 tending much beyond it. Head large, flattened above. Eyes very 

 large, with simple, thin, free, circular lids, without any sinus. Open- 

 ings of the ears, behind the eyes, minute, with a small, erect, clavate, 

 fleshy process of the skin. Arms long, tapering, equal to the length 

 of head and body combined ; the lateral pairs are equal ; the dorsal 

 and ventral nearly equal, somewhat shorter than laterals; suckers 

 deeper than broad, well rounded, laterally attached by slender pedi- 

 cels ; horny rings with smooth, circular, thin edges, except on the 



