CEETACEOUS PERIOD. 199 



Length of a large example, nineteen millimeters; breadth of its last 

 volution, including the outer lip, ten millimeters. 



Mr. Meek described (loc. cit.) tAYO other closely-related species, all from 

 the Cretaceous sti-ata at Coalville, Utah, which he proposed to group under 

 the subgeneric name of Admetopsis. Their generic characters are very 

 closely like those which distinguish the recent genus Admete, but I agree 

 with Mr. Meek in regarding the difiPerences as of at least subgeneric if not 

 full generic value. In Admetopsis it is the lower fold upon the coliunella 

 that is most prominent, being particularly so just where it blends with the 

 truncated end of the columella. In Admete, on the contrary, it is usually 

 the second fold that is most prominent. The inner lip also of the former, 

 tinlike that of the latter, is thickened along its whole length, and the shells 

 throughout are a trifle more massive than those of Admete usually are. 



Position and locality. — Strata of the Cretaceous period; North Fork of 

 Virgin River, Utah. 



Class CEPHALOPODA 



Oeder TETRABRANCHIATA. 

 Family BACULITID^. 



Genus BACULITES Lamarck, 180L 



Baculites ovatus Say. 

 Plate XIX, figs. 4 a, h, and c, and 5 a, h, and c. 



Among the collections made from Cretaceous strata at a locality south- 

 east of Paria, Utah, there are several specimens of a species of Baculites. 

 They are all small, slender shells, and in all observable respects they agree 

 with young examples of B. ovatus Say. 



It is, however, a noticeable fact that, although a considerable collection 

 of different species of fossils were obtained at that locality, only these very 

 small examples of Baculites were found among them. This fact suggests 

 the possibility that these examples may be adult forms and specifically dif- 

 ferent from B. ovatus. In want of further evidence upon this point, how- 

 ever, I do not at present feel warranted in referring them to any other 

 ■ species. 



