﻿26 Bulletin 20 104 



striae crossed by fine concentric striae of variable size. 

 Locality: — Princeton, Mont. 



Schuchertella chemungensis var. arctostriata (Hall) 

 PI. II figs. 1— ic. 



The fossils referred to this species are marked by slender 

 threadlike striae of fairly uniform size and crossed by fine con- 

 centric striae. 



The specimens from Princeton are much smaller than those 

 from Livingston, which average about three-fourths of an inch in 

 width. The largest of the three specimens from Livingston 

 measures about one-half inch in width. 



Locality. — Phillipsburg and Livingston, Montana; Logan, 

 Utah. 



Schuchertella extensus, n. sp. 

 PI. I figs. 8-8b. 



Shell elongate, and plano-convex. 



Pedicle valve moderately convex, sloping rather regularly to 

 the front and sides. Beak somewhat twisted. Area very high 

 and strongly inclined backward; its height equals nearly two- 

 thirds the length of the hinge line. 



Brachial valve nearly flat with a slight concavity on one side 

 the median line. 



Surface marked by rather strong rounded striae of uniform 

 size. From five to six striae occupy the space of 2 mm. at the 

 anterior margin of shell. 



This species is distinguished from others of the genus by the 

 high area and short hinge line and elongate form. 



Locality. — Sixteen P. O., Montana. 



Camarotcechia sp. 

 The collection contains two fragmentary specimens of a 

 Camarotcechia of undetermined species. 

 Locality. — Paradise P. O., Utah. 



