138 PALEONTOLOGY OF THE EUKEKA DISTEICT. 



Spirifera Bnglemanni Meek. 



Spirifera Bnglemanni Meek, 1860. Proc. Acad. Nat. Sci. Philad., vol. xii, p. 308. 



Meek, 1876. Rep. Expl. Great Basin of Utah (Simpson), p. 346, 



pi. i, figs. 1 Or-c. (Not 8. Englemanni, M. & W.) 

 Meek, 1877. Rep. Geol. Expl. Fortieth Par., vol. iv, p. 41, pi. 

 iii, figs. 3a-e. 



The original specimens of this species were found at The Gate, north- 

 west of Eureka, by Colonel Simpson's exploring party, and subsequently 

 Mr. Arnold Hague obtained examples from the White Pine Mountains south- 

 east of the Eureka District. 



The specimens in the present collection came from Newark Mountain, 

 in the upper portion of the Devonian limestone, and present the essential 

 characters given by Mr. Meek in his description of the species. 



Spirifera Finonensis Meek. 

 Plate iv, figs. 1, la-/. 



Spirifer (Trigonotreta) Pinonensis Meek, 1870. Proc. Acad. Nat. Sci. Philad., vol. xxii, 

 p. 60. Ibid., 1877, Geol. Expl. Fortieth Par., vol. iv, p. 45, pi. i, figs. 9 a, b. 



Spirifera (Trigonotreta) argentarim Meek, 1877. Geol. Expl. Fortieth Par., vol. iv, p. 

 42, pi. iv, figs. 4 a-b. 



This species ranges from the base to the summit of the Devonian 

 limestone, throughout the Eureka District, and also occurs in the Pinon 

 Mountains, where the original types described by Mr. Meek were collected. 

 In the White Pine Mountains the variety described as S. (T.) argentarim 

 Meek is found in the Middle and Upper Devonian. The species 8. Pino- 

 nensis was founded on the larger, more coarsely ribbed variety. Among 

 the large series collected in the Pinon Range a shading off into the smaller, 

 finer ribbed form is observed, and among the still more extensive series from 

 the Eureka District the gradation of form and characters between the type 

 of S. Pinonensis and P. argentarius is complete. 



Formation and localities. The species ranges throughout the Devonian 

 limestone, having been found in the upper beds south of The Gate and at 

 Newark Mountain ; at the lower horizon it occurs at Comb's Peak ; Atrypa 

 Peak; Lone Mountain, 18 miles northwest of Eureka, etc., Eureka District; 

 also at the west base of Mount Argyle, White Pine District, Nevada. 



