134 PALEONTOLOGY OF THE EUEEKA DISTEICT. 



Surface marked by closely arranged, slightly undulating, concentric 

 striae and slight undulating ridges of growth in some examples. A few slen- 

 der curved spines are scattered irregularly over the surface. 



The interior of the ventral valve is minutely papillose throughout; 

 other interior characters unknown. 



It is with hesitation that a new specific name is given to a species of 

 this genus, owing to the range of specific variation within it. As indicated 

 by the name, the species is related to P. Mrsuta Hall of the Chemung Group 

 of New York. It differs in the surface characters. It has a few minute 

 scattered spines on a comparatively smooth surface, while P. hirsuta has fine 

 spines with elongate bases over the entire surface, and also a row of long 

 spines near the cardinal border. 



Formation and localities Upper Devonian, White Pine shale, on the 

 south slope of Diamond Peak, Eureka District, and also at the same geologic 

 horizon throughout the shale on the east side of Applegate Cafion, White 

 Pine Mining District, Nevada. 



Genus SPIEIFEEA Sowerby. 



Spirifera disjuncta Sowerby, 1840. 



Synonyms: See Davidson's Monograph of British Devonian Brachiopoda, and Paleon- 

 tology of New York, vol. iv, p. 243. To this there may be added: 

 Spirifera Norwoodi Meek, I860. Proc. Acad. Nat. Sci. Philad., vol. xii, p. 308 (not 8. 



Norwoodi Hall). 



Utahensis Meek, 1860. Note appended to extra copies of above cited paper. 

 Kennicotti Meek, 1868. Trans. Chicago Acad. Nat. Sci., vol. i, p. 101, pi. xiv, 



fig. 9. 



Utahensis Meek, 1876. Eep. Expl. Great Basin of Utah, Simpson, p. 345, and 

 Geol. Expl. Fortieth Par., 1877, vol. iv, p. 39, pi. iii, figs. la-e. 



The types of Mr. Meek's Spirifera Utahensis were collected at The 

 Gate, northwest of Eureka, and cited as coming from a dark limestone of 

 Devonian age, in longitude 115 26' W., latitude 39 30' N., a locality 

 named Swallow Canon by Captain Simpson, and now known as The Gate. 

 From this locality a number of very perfect specimens were obtained by 

 the Eureka Survey. They exhibit the narrow, rotund form, and also the 

 short form with extended lateral angles. The examples of the species used 



