FOSSILS OF THE DEVONIAN. 



175 



Length of average size specimen, 12 mm ; height, 7 mm . 



This species is allied to the young shells of Grammysia Hannibalensis 

 Shumard (Pal. N. Y., vol. v, pt. 1 , Plates and Explanations, pi. Ixi, figs. 23-33), 

 but in the more anterior position of the beaks and small size it differs; 

 it occurs at an horizon about 3,500 feet lower in the strata. 



Formation and localities. Upper portion of the Devonian limestone, on 

 Rescue Hill, west of Rescue Canon, and also at The Gate, northwest of 

 Eureka, Nevada. 



Genus SANGUINOLITES McCoy. 



Sanguinolites ? Combensis, n. sp. 



Plate xv, fig. 16. 



Shell very elongate, the length being about four times the height; 

 moderately convex. Anterior end contracted and uniformly rounded on 

 the lower portion, about one-sixth the entire length of the shell, measuring 

 from the beaks'; the nearly straight basal line is interrupted only by the 

 sinuosity caused by the broad byssal furrow at the anterior third of its 

 length; posterior end of the shell somewhat narrowed, terminating in a 

 rather abruptly rounded extremity on the upper portion of the posterior 

 outline; cardinal line straight anteriorly, becoming slightly arcuate on the 

 posterior third. 



Surface marked by numerous concentric lines of growth. 



The generic reference of this species is somewhat provisional, as there 

 is but one imperfect right valve in the collection, which, although strongly 

 characterized, does not give the hinge structure, and other important feat- 

 ures of value in generic determinations. 



Formation and locality. Lower Devonian, Combs Peak, Eureka District, 

 Nevada. 



Sanguinolites? gracilis, n. sp. 

 Plate iv, fig. 10. 



Shell slender, elongate. General surface moderately convex, the upper 

 margin reflected, forming a slightly concave lunette along nearly the entire 

 length of the hinge, which is a little shorter than the length of the shell. 

 Beaks small near the anterior end and slightly incurved. 



