i? 
A, EF. Verrill—North American Cephalopods. 211 
by faint ridges or lines of growth parallel with the posterior margin ; 
a slight 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 ale. 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 toward 
the tip; at its base there isa 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 ale 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 ale 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 striz 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 ale, 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 ale; 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 alae, 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 striz, 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 
