266 
A. E. Verrill — North American Cephalopods. 
upper mandible lias the rostrum regularly curved, with a distinct 
ridge, in continuation with its inner edges, extending down the sides, 
and only a slight notch at its base. 
The lower mandible has a notch close to the tip, with the rest of 
the inner edge nearly straight; at the base is a rather large and wide 
V-shaped notch ; the tooth beyond it being broad-triangular and 
rather large ; beyond the tooth the aloe are white, soft and cartil- 
aginous. 
Measurements of jaws (in inches). 
Transverse diameter of buccal mass, 1*50 
Vertical diameter of buccal mass, 1*70 
Upper Mandible : 
Tip to end ot‘ frontal lamina, _ . _ 1*25 
Tip to notch, _ "37 
Tip to lateral border of lamina,.. *J7 
Lower Mandible : 
Tip to border of mentum, ’45 
Tip to lateral border of aloe, ‘70 
Tip to inner end of alae, 102 
Tip to bottom of notch, '32 
Height of tooth, *06 
Notch to inner end of alae, - 80 
Mentum to inner end of alae, 1*20 
The portion of the oesophagus preserved is 14*75 inches long and 
about *15 of an inch broad, in its flattened condition. 
The odontophore (Plate XXXVIII, figs. 1, 2) is amber-color, *18 of 
an inch broad. The tridentate median teeth have moderately long but 
not very acute points, of which the middle one is a little the longest. 
The inner lateral teeth are bidentate and somewhat broader and longer 
than the median ones; their outer denticle is well-developed, but 
considerably shorter than the inner one. The next to the outer 
lateral teeth are larger at base and much longer, simple, broad, 
tapering, flattened, slightly curved, acute at tip. They appear not 
to have the small lateral denticle observed on the corresponding 
teeth of the adult Architeuthis (see Plate XVI«, figs. 1, 2). The 
outer lateral teeth are similar to the preceding, but rather larger and 
not quite so broad at base. The marginal plates are well-developed, 
thin, somewhat rhomboidal. 
The internal cavity of the ears is somewhat irregularly three-lobed, 
with several i*ounded papillae projecting inward from its sides, very 
much as in those of Ommastrephes. Each ear contained two irregular- 
shaped otoliths, one of which (Plate XXXVIII, fig. 4) was much 
larger than the other, in each ear. 
The eyes were both burst, and most of their internal structure was 
destroyed. So far as preserved they closely agree with those of 
