250 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [40] 



inner edge nearly straight ; at the base is a rather large and wide, V-shaped 

 notch, the tooth beyond it bein^g broad-triangular and rather large; 

 beyond the tooth the alse are white, soft, and cartilaginous. 



Measurements of jaies (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 57 



Tip to lateral border of lamina 77 



Lower mandible : 



Tip to border of mentum 45 



Tip to lateral border of ala? 70 



Tip to inner end of al?e 1.02 



Tip to bottom of notch , 32 



Hight of tooth '. 06 



Notch to inner end of al» 80 



Mentum to inner end of alse 1. 20 



The portion of the oesophagus preserved is 14.75 inches loug and about 

 .15 of an inch broad, in its flattened condition. 



The radula (Plate Y, figs. 5-7) is amber-colored, .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 teetl are larger at base 

 and much longer, simple, broad, tapering, flattenal, slightly curved, 

 acute at tip. They appear not to have the small lateral denticle observed 

 on the corresponding teeth of the adult Architeuths (see Plate V, figs. 

 1, 2). The outer lateral teeth are similar to the preceding, but rather 

 longer 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 Ommast replies. Each ear contaiied two irregular-shaped 

 otoliths, one of which (Plate V, fig. 8) was nnch larger than the other, 

 in each ear. 



The eyes were both burst, and most of thar internal structure was de- 

 stroyed. So far as preserved they closelyagree with those of Omnu*- 

 strepJies. The eyeballs were large and sonewhat oblong in form, and 

 appear to have been nearly 2 inches bread and 3 long. The eyelids 

 are badly mutilated, but the anterior snus can be imperfectly made 

 out. It seems to have been broad and romded. The aquiferous cavities 

 appear to have been like those of Omnastreplies. The form and struc- 

 ture of the cartilaginous 'brain-box' rfso appear to be essentially the 

 same as in the genus last named. 



