CANADIAN PERIOD. 55 



similar to that of the well-known Strophomena fragilis Hall, from the 

 Devonian strata of New York and other States. Fine concentric striae are 

 also visible .under a lens. 



Length, eighteen millimeters ; breadth, twenty-four millimeters. 



This species resembles S. recta Com-ad in outline, but the sm-face- 

 markings are quite different. It also bears a general resemblance to S. aurora 

 Billings, but differs in having rounded striae of uniform size instead of the 

 angular striae of variable size which that species possesses. 



Position and locality. — Strata of the age of the Quebec group of Canada; 

 Fish Spring, House range, Utah. 



Genus OETHIS Dalman, 18:i8. 

 Orthis Electra Billings (?). 

 Among the collections made at Fish Spring, House range, Utah, from 

 strata of the age of the Quebec group of Canada, are a few imperfect 

 specimens of a species of Orthis that is very closely related to 0. Electra 

 Billings (Paleozoic Fossils of Canada, vol. I, page 79), if it is not identical 

 with it. In outline, convexity, and the fine striation of the sm-face, our 

 specimens agree closely with it, but the size is considerably greater than 

 that given for 0. Electra. The width at the hinge-line of the largest speci- 

 men is about sixteen millimeters. 



MOLLUSCA VERA. 



Class GASTEROPODA. 



Subclass DICEC A. 



Oedee RHIPHIDOGLOSSA. 



suboedee dioeanobeanobiata. 



Family BELLEROPHONTID^. 



Genus BELLEEOPHON Moutfort, 1808. 



Bellerophon allegoricus White. 



Plate III, fig. 6 a, b, aud e. 



Bellerophon allegoricus White, 1874, Expl. & Surv. west 100th Merid., Prelim. Eep. 

 Invert. Foss., 10. 



Shell not above medium size, rather compact, lunbilicated ; umbilicus 



