FOSSILS OF THE DEVONIAN. 171 
Modiomorpha obtusa, n. sp. 
Plate iv, figs. 8, 8a. 
Shell subrhomboidal in outline. General surface strongly convex, the 
umbonal ridge rounded. Hinge-line about one-half the length of the shell. 
Beaks small, incurved, and situated on the anterior third of the cardinal por- 
tion of the shell. 
Surface marked by a few concentric lines of growth. Anterior muscu- 
lar sear large, well defined; other interior characters unknown. 
Dimensions: height, 1.5°™; width, 2.5; depth of right valve, 0.5™. 
To some of the more transverse forms of Modiomorpha quadrula Hall 
(Pal. N. Y., vol. v, pt. 2, Plates and Explanations, pl. xli, figs. 18-26), 
this species bears a stronger resemblance than to any other form we know. 
It differs in the character of the umbonal ridge and the posterior extension 
of the shell. ; 
Formation and locality—Lower Devonian of Brush Peak, Eureka Dis- 
trict, Nevada, and also at the same horizon on Lone Mountain, 18 miles 
northwest of Eureka, Nevada. 
Genus GONIOPHORA Phillips. 
Goniophora perangulata H. 
Plate xv, fig. 10. 
Sanguinolites perangulatus Hall, 1870. Prelim. Notice Lam. Shells, p. 35. 
Goniophora perangulata Hall, 1883. Pal. N. Y., vol. v, pt. 1, Plates and Explanations, 
p. 12, pl. xxxiv, figs. 1-7. 
In identifying this species a direct comparison was made between the 
specimens from Nevada and the type specimens from the Upper Helder- 
berg Group of New York, at the New York State Museum of Natural His- 
tory, Albany, N.Y. No variations of specific value were observed; the 
identification is further strengthened by the presence of Pterinea flabella and 
several species of Brachiopods, that are associated with the species at each 
locality 
Formation and locality—lLower Devonian; Lone Mountain, 18 miles 
northwest of Eureka, Nevada. 
