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 aire are white, soft and cartil- 

 aginous. 



Measurements of jaws (in inches). 



Transverse diameter of buccal mass, _. 1 



Vertical diameter of buccal mass, 1 



Upper Mandibk: 



Tip to end of frontal lamina, 1 



Tip to notch, 



Tip to lateral border of lamina. .. 



Lower Mandible : 



Tip to border of mentum, 



Tip to lateral border of alas, 



Tip to inner end of alse, 1 



Tip to bottom of notch, 



Heiglit of tooth, 



Notch to inner end of alse, 



Mentum to inner end of alse, 1 



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 Architeitthh (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 three-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 XXXVUI, fig. 4) was much 

 larger than the other, in each ear. 



The eyes were both burst, and most of tlieir internal structure was 

 destroyed. So far as preserved they closely agree with those of 



