A. E. Yerr ill — North American Gephalopods. 
295 
Calliteuthis Yerrill. 
Amer. Joum. 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 the 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 Ommastreplies. 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 
laminie ; the space between them opens along the outer edge. 
Calliteuthis reversa Yerrill. 
Amer. Joum. Sci., xx, p. 393, Nov., 1880 ; Proc. Nat. Mus., iii, p. 362, Dec., 1880. 
Plate XLVI, figures 1-16. 
Body rather short, tapering backward, 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 subdorsally, 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 
