266 A. E. Verrill — North Atnerican Cephalopods. 



upper mandible has 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 of frontal lamina, 1-25 



Tip to notch, -37 



Tip to lateral border of lamina, .. -77 



Loiver Mandible : 



Tip to border of meutum, -45 



Tip to lateral border of alfe, _. -70 



Tip to inner end of alae, 1'02 



Tip to bottom of notch, "32 



Height of tooth, -06 



Notch to inner end of alae, ._ '80 



Mentum to inner end of alje, 1'20 



The portion of the oesophagus preserved is 14-75 inches long and 

 about 'IS 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 Architeuthh (see Plate XVIa, 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 tliree-lobed, 

 with several rounded papillae projecting inward from its sides, very 

 much as in those of Ommastrephes. Each ear contained two irregular- 

 shaped otoliths, one of which (Plate XXXVIIT, 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 



