206 



REPORT OF NATIONAL MUSEUM, 1884. 



" The fauna of the Devouian is large aud represeut;itive, uotwith- 

 standiug some species have reversed their relative position in the groop 

 as they have been known heretofore, and others have a greater vertical 

 range. 



" The fauna of the White Pine shale, in the White Pine district, is in 

 many respects a peculiar one, combining as it does species ranging from 

 the Middle Devonian into the Lower Carboniferous. The stratigraphic 

 position of the shale is at the summit of the Devonian system and at the 

 base of the Carboniferous ; it is overlain in the Eureka district, where 

 the section is unbroken, by a massive belt of conglomerate before the 

 limestones carrying the Lower Carboniferous fauna appear in the sec- 

 tion. The most strongly marked Carboniferous species are Sjnriferina 

 cristata, Eetzia radialis, Athyris suhlam ell osus, and Cardiomorpha Missoii- 

 riensis. These are associated at the same horizon with such Devonian 

 species as Discina Lodensis, Productus suhaculeatus, Amboccelia unibona, 

 Bliynchonella (LeiorJiyncJiv.s) qvadricostata, Aviculopecten catactus, and 

 Lunulicardium fragosmn. 



"The White Pine shales occupy the same position with relation to 

 the Devouian and the Carboniferous systems as does the lower portion of 

 the Pogonip limestone to the Cambrian and Silurian systems. In each 

 case there are beds of passage carrying a fauna that unites the faunas 

 of the two systems. 



"A summary of the Devouian fauna is given in the following table : 



Groups. 



Porifera 



Actinozoa 



Polyzoa 



Brachiopoda 



Jiamellibranchiata 

 Gasteropoda . .. . 



Pteropoda 



Ccplialopoda 



Crustacea 



Poecilopoda 



Total 



Nevada. 



225 



P. 



S '= 



p. 

 P 



Common to Kevada and 



New York. 



79 



Falls of 

 Ohio. 



23 



Iowa. 



17 



*■ And five vaiieties. 



"The Devonian corals, as well as those of the Silurian and Carbon- 

 iferous, are not illustrated, and only short notes are given of a portion 

 of the twenty-seven species occurring- in the Devonian. From what is 

 already known of this portion of the fauna there is little doubt but 

 that future collections from the area of the Great Basin will give a 



