206 



REPORT OF NATIONAL MUSEUM, 1884. 



" The fauna of the Devonian is large and representative, notwith- 

 standing some species have reversed their relative position in the group 

 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 Spiriferina 

 cristata, Retzia radialis, Athyris sublamellosus, and Cardiomorpha Missou- 

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

 species as Discina Lodensis, Productus subaculeatus, Ambocoelia umbona, 

 Rhynchonella (LeiorhyncJiv.s) quadricostata, Aviculopecten catactus, and 

 Lunulicardium fragosum. 



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

 the Devonian 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 Devonian fauna is given in the following table : 









Nevada 







Common to Nevada and 























New 



York. 



Falls of 

 Ohio. 



Iowa. 





















Groups. 







•a 



o 



1 



3 



© 



<D 



Si 













§ 



m 







> 

 A 



U 



> 



P 



(4 





a 





00 



00 

























a 





* 



Ph 



&r 



a 





i 







O 



ft 

 02 



o 



p 



t> 



Ct5 



5* 



CO 



ft 





Porifera 



3 

 14 



3 



27 



3 

 15 



1 



13 



i 

 i 



2 

 1] 











11 



9 



3 



Polyzoa 



2 

 26 



3 

 *83 



3 

 50 







2 

 26 







1 





51 



18 



38 



8 



11 



Lamellibranchiata 



29 



42 



27 



17 



2 



27 



9 



2 



2 





13 



39 



23 



17 



1 



11 



12 



4 





Pteropoda 



5 

 4 



8 

 11 



7 

 7 



2 



4 



1 



5 

 4 



5 







Cephalopoda 







Crustacea 



2 



4 



2 

 7 



2 

 4 







2 



4 









Pcecilopoda 



3 





4 













Total 



102 



225 



141 



108 



24 



94 



79 



23 



17 







* And five varieties. 



"The Devonian corals, as well as tbose 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 



