210 A. E. 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, Tlieir 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. 



Arcliiteuthis i)rinceps Verrill, Amer. Journ. Science, vol. ix, pp. 124, 181, Plate V, 

 1875; American Naturalist, vol. ix, pp. 22, 79, figs. 25-27, 1875. 



Ommastreplies {Architeuthis) princeps Tryon, Manual of Conchology, p. 185, PI. 85, 

 1879 (figures copied and description compiled from papers by A. E. V.). 



Plate XVII, Plate XVIII, Plate XIX, Plate 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 tlie 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 tin, Avhich 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, .SV"™ (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 laminse are relatively thicker than in A. Ilarveyi. The rostrum 

 and most of the frontal regions are black and polished, gradually 

 becoming orange-])rown and translucent toward the posterior border, 

 and marked with faint striae radiating from the tip of the beak, and 



