288 A. E. Verrill— Cephalopoda of North America. 
Prate XIII. 
The principal diagnostic characters of this species, so far as 
determined, are as follows: Sessile arms unequal in size, nearly 
equal in length, decidedly shorter than the head and body to- 
gether, and scarcely as long as the body alone. Tentacular 
arms, in extension, about four times as long as the short arms: 
about three times as long as the head and body together. 
Caudal fin small, less than one-third the length of the mantle, 
sagittate in form, with the lateral lobes extending forward much 
eyond their insertions; the posterior end tapering to a long 
acute tip. Jaws with a smaller notch and lobe than in A. 
princeps. Suckers of the sessile arms (so far as seen) mostly 
with numerous acute teeth all around the circumference, all 
similar in shape, but those on the inner margin smaller than 
those on the outer, and sometimes obsolete in certain suckers. 
Sexual characters are not yet determined. 
Architeu errill, this Journal, vol. ix, pp. 124, 181, Plate v, 1875; 
American Naturalist, vol. ix, pp. 22, 79, figs. 25-27, 1875; Trans. Conn. Acad. 
Vv, pp. 21 Plates xvii to xx, Jan. and Feb., 1 
80. 
teuthis) princeps Tryon, Manual of Conchology, P. ~ PL 
the inner edge slightly or imperfectly denticulated ; the others 
having less oblique rings, with the acuminate denticles sim- 
iar in form all around, though smaller on the inner margin; 
by the stronger jaws, which have a deeper notch and a more 
elevated tooth on the anterior edge; and by the caudal fin, 
which is short-sagittate in form, with the posterior end less 
elongated than in the preceding species. 
Sthenoteuthis megaptera Verrill. (Broad-finned large squid). 
Trans. Conn. Acad., v, p. 223, Pl. xxi, figs. 1-9, Feb., 1880. 
Architeuthis megaptera Verrill, this Journal, vol. xvi, p. 207, 1878. aa 
Manual of Conchology, vol. i, p. 187 (description copied from preceding paper, 
The original specimen was found thrown ashore near Ca 
Sable, N.S. To this species is doubtfully referred a ae 
taken on Sable I. Bank, in 280-300 fathoms, by Capt. Geo. 
Johnson and crew, of the schooner “ A. H. Johnson. 
