198 PALEONTOLOGY OF THE EUEEKA DISTRICT. 



Professor Hall, in speaking- of Styliola fissurella, says: 



"In its geographical distribution, the S. fissurella has a remarkable 

 range, being known throughout the entire extent of the State of New York 

 from east to west, a distance of more than 300 miles. It also occurs in the 

 State of Indiana, which gives it a geographical extension of more than 700 

 miles in a direct line from its most easterly locality. 



"In some of its phases it does not seem possible to separate this spe- 

 cies from Styliola clavulus of Barrande by any external or internal characters 

 thus far described or illustrated. The fossils are minute, smooth, or striated 

 acicular tubes, presenting in all respects similar features and having similar 

 associations, and they are of the same geological age in the two countries. 

 In very numerous examples these fossils are striated transversely or longi- 

 tudinally, and not unfrequently the two sets of striae are visible on the same 

 specimen. These are apparently only varieties of form and condition of 

 the Styliola fissurella" 



These latter remarks apply in full force to the specimens of this inter- 

 esting species as it occurs in Central Nevada. Here it has the same asso- 

 ciations and is of the same geologic age. It has not been discovered, as 

 far as known, in the interval of 1,600 miles between its former known west- 

 ern extension in the State of Indiana and the present limit. This is, how- 

 ever, largely due to the few localities where the Devonian rocks are ex- 

 posed to examination, and the fact that the great mass of Paleozoic strata 

 west of the Mississippi Valley have been but partially examined by the geolo- 

 gist, and paleontologic investigation has been the result of hasty collecting 

 rather than a systematic study of the fauna of any locality or horizon. 



Formation and locality. Upper Devonian limestone, Eureka District, 

 Nevada. 



Genus CONULAKIA Miller. 



Conularia (sp. undt.). 



A single fragment was found in the lower beds at Comb's Peak, but 

 not in a condition to determine its specific relations. 



