108 PALEONTOLOGY OF THE EUREKA DISTRICT. 



Lingula Alba-pinensis, n. ep. 

 Plate ii, figs. 1, la. 



Shell small, elongate, elliptical, moderately convex; beaks obtusely 

 angular; sides of shell curving with a gentle convexity from the lateral 

 cardinal slope to the rather abruptly rounded front 



Surface marked by fine concentric striae and rather strong lines of 

 growth for so small a species. No radiating lines have been observed. 



Dimensions: length of the largest specimen found, 6 rai "; width at cen- 

 ter, 3 mm . The other specimens average 2.5 mm in length by about l.. r , mm in 

 width. 



Associated with these there is a minute form that differs in being more 

 broadly elliptical; otherwise it may be referred to L. Alba-pinensis. The 

 latter species belongs to the Devonian Group of Lingula, of which L. Melie 

 and L. Ligea are types, and is also very much like the. young of L myti- 

 loides of the Carboniferous. 



In the Eureka District Lingula Melie (see pi. ii, fig. 4) is the only Lin- 

 gula yet discovered in the White Pine shale. 



Formation and locality. Upper Devonian, White Pine shale, White Pine 

 District, Nevada, 



Lingula Lonensis, n. sp. 

 Plate xiii, figs. 1, la. 



Shell broadly ovate ; beaks obtusely angular, the sides sloping away at 

 an angle of about 110, and then extending forward with more or less con- 

 vexity to the broadly rounded front. 



Surface marked by numerous lines of growth that give a finely imbri- 

 cated appearance to the outer portions of the shell. No radiating lines or 

 striae are visible on the specimens before us. Two specimens measure: 

 length, 10 mm ; width, 8 mm ; length, ll mm ; width, 10 mm , respectively. 



The specimens are imbedded in a shaly limestone, and are very much 

 compressed, which gives them a broader outline than when in a natural 

 condition. 



The species is allied to Lingula Lucretia Billings (Pal. Foss., vol. ii, pt. 



