A. M Verrill — JVbrth American Cephalopods. 211 



by faint ridges or lines of growth parallel with the posterior margin ; 

 a sliglit but sharp ridge extends backward from the notch at the base 

 of the cutting edge, and other less marked ones from the anterior 

 border of the alae. The tip of the beak is quite strongly curved for- 

 ward, and acute, with a slight shallow groove, commencing just 

 below the tip, on each side, and extending backward only a short 

 distance and gradually fading out. The front or cutting edge is 

 nearly smooth and well curved, the curvature being greatest tOAvard 

 the tip ; at its base there is a broad angular notch, deepest externally. 

 The inner face of the rostrum is convex in the middle and concave 

 or excavated toward the margins, which are, therefore, rather sharp. 

 The anterior borders of the ala3 are convex, or rise into a broad, but 

 low, lobe or tooth beyond the notch, but beyond this they are nearly 

 straight, but with slight, irregular lobes, which do not correspond on 

 the two sides. The anterior edges of the alge make nearly a right 

 angle with the cutting edges of the rostrum. The palatine lamina 

 is broad, thin, and dark brown, becoming reddish brown and trans- 

 lucent posteriorly, with a thin, whitish border. The surface is 

 marked with unequal divergent striae and ridges, some of which, 

 especially near the dorsal part, are quite prominent and irregular ; 

 the posterior border has a broad emargination in the middle, but the 

 two sides do not exactly correspond. 



The lower jaw (Plate XVIII, fig. 2) was badly broken, and 

 many of the pieces, especially of the alte, are lost, but all that 

 remain have been fitted together. The extreme length is 92™™ 

 (3-63 inches) ; the total breadth, and the distance from front to 

 back cannot be ascertained, owing to the absence of the more 

 prominent parts of the oiiM ; from tip of beak to posterior ven- 

 tral border of mentum, 42*6""" (1*68 inches) ; from tip of beak to 

 posterior lateral border of ala?, 55 •9'""' (2*20 inches) ; from tip of beak 

 to posterior ventral border of gular lamina, 60"'™ (2-37 inches) ; from 

 tip of beak to bottom of notch at its base, 20""" (-80 inch) ; tip of 

 beak to inner angle of gular lamina, 47"'™ (1*85 inches); height of 

 tooth from bottom of notch, 6"25""" ("25 inch) ; breadth between 

 teeth of opposite sides, 15™'" (-60 inch) ; breadth of gular lamina, 

 in middle, 44*5™™ (1"75 inches). The beak is black, with faint radiat- 

 ing stria3, and with slight undulations parallel with the posterior 

 border ; the rostrum is acute, slightly incurved, with a notch near the 

 tip, from which a very evident groove runs back for a short distance, 

 while a well marked angular ridge starts from just below the notch, 

 and descends in a curve to the ala, opposite the large tooth, defining 



