FOSSILS OF THE DEVONIAN. L3G 
Spirifera Parryana Hall? 
Plate xiv, fig. 10. 
Spirifer parryanus Hall, 1858. Geology of Lowa, vol. i, pt. 2, p. 509, pl. iv, figs. 8a, b. 
Parryana Billings, 1861. Can. Jour., vol. vi, p. 261, figs. 77, 78. 
The original type of this species is from the Hamilton Group of Iowa. 
In all essential specific characters the ventral valve of the Nevada shell, 
the only portion discovered, is similar to that of the Iowa type, differing 
mainly in the absence of the fine concentric striz crossing the radiating 
strie. Each of these features, the simple radiating striae and the concentric 
stri, occur on different specimens of an allied species, S. mesastrialis, of the 
Chemung Group of New York. The finding of entire shells may afford 
specific distinctions not known at present, but with the present specimens, 
the identification is made with S, Parryana. 
A specimen collected by the geologists of the Fortieth Parallel Geo- 
logical Survey, labeled “‘ Pinon Range,” is larger than the Kureka specimens, 
but otherwise agrees with the specimen illustrated. 
Formation and locality—Devonian limestone, on the divide at the head 
of the Reese and Berry Cation, Eureka District, Nevada. 
Spirifera (sp. und’t.). 
This species is allied to the group represented by Spirifera Manni, of 
the Upper Helderberg Group of New York and Ohio. The ventral valve is 
subpyramidal, the height nearly equaling one-half the length. Apex slightly 
projecting over the area. Mesial sinus well-defined, reaching to the apex. 
Area elevated, slightly concave above; fissure open to the apex, about twice 
as long on the sides as the width at the base. 
Surface marked by. six or seven subangular or rounded plications on 
each side of the median sinus. Finer surface markings unknown, owing to 
the exfoliation of the shell. 
Owing to the fact that species of this genus undergo great variations, and 
that our material is unsatisfactory, no specific reference is made of this shell. 
Formation and localities—Devonian limestone, Comb’s Peak, Eureka 
District, and Lone Mountain, 18 miles northwest of Kureka, Nevada. 
