210 A. EF. Verrill—North American Cephalopods. 
diameter, but though somewhat smaller than in the specimen just 
described, they have the same kind of denticulation around the 
margin. Their smaller size may indicate that the specimen was a 
male, but they may not have been the largest of those on the arm. 
Architeuthis princeps Verrill. 
Architeuthis princeps Verrill, Amer. Journ. Science, vol. ix, pp. 124, 181, Plate V, 
1875; American Naturalist, vol. ix, pp. 22, 79, figs. 25-27, 1875. 
Ommastrephes (Architeuthis) princeps Tryon, Manual of Conchology, p. 185, Pl. 85, 
1879 (figures copied and description compiled from papers by A. E. V.). 
PLATE XVII, Puate XVIII, PLATE XIX, PuatE XX. 
This species is distinguished by the length and inequality of the 
short arms, of which the longest (ventral or subventral) exceed the 
combined length of the head and body by about one-sixth ; by the 
denticulation of the suckers of the short arms, of which there are two 
principal forms, some having very oblique horny rings with the outer 
edge very strongly toothed and the inner edge slightly or imperfectly 
denticulated ; the others having less oblique rings with the denticles 
similar 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 acuminate than in the 
preceding species. 
This species was originally based on the lower jaw, mentioned as 
No. 1, and on the upper and lower jaws, designated as No. 10, in the 
first part of this article. The jaws of No. 10 were obtained from 
the stomach of a sperm whale taken in the North Atlantic, and were 
presented to the Essex Institute by Capt. N. E. Atwood, of Province- 
town, Mass., but the date and precise locality of the capture are un- 
known. The size and form of these jaws is well shown in Plate 
XVIII, figs. 1,2. The total length of the upper jaw (fig. 1) is 127™™ 
(5 inches); greatest transverse breadth, 37™™ (1°45 inches); front 
to back, 89"™ (3°5 inches); width of palatine lamina, 58°9™™ (2°32 
inches). The frontal portion is considerably broken, but the dorsal 
portion remaining appears to extend+nearly, but not quite, to the 
actual posterior end, the length from the point of the beak to the 
posterior edge being 86:4™™ (3°4 inches). The texture is firmer and 
the lamine are relatively thicker than in A. Harveyt. The rostrum 
and most of the frontal regions are black and polished, gradually 
becoming orange-brown and translucent toward the posterior border, 
and marked with faint striz radiating from the tip of the beak, and 
