48 NEW YORK STATE MUSEUM 



During the year 191 1 the lamellibranchs of the Domanik have been 

 elaborated in detail by A. Zamjatin (Die Lamellibranchiata des 

 Domanik: Memoires du Comite Geologique. n. ser. livr. 67. 191 1) 

 and the very peculiar genera and species vv^hich compose this ele- 

 ment of the Naples fauna, many of the genera not heretofore recog- 

 nized outside of this assemblage in New York, have proved to be 

 present in the fauna of the Domanik. There is a remarkable com- 

 munity of species which is supplemented by approximations to 

 identity in other cases, all tending to show that the extraordinary 

 similarity in the faunas indicated by Holzapfel's and my own studies 

 of the goniatites is even surpassed by the agreement among the 

 bizarre types of lamellibranchs. Lists of these species as they occur 

 in these two regions are here inserted. The New York fauna appears 

 to be much the more profuse but it is very probable that this fact 

 is due to the more extensive collecting and longer study that have 

 been devoted to it. 



PORTAGE, NEW YORK DOMANIK SHALES 



(NAPLES fauna) TIMAN, RUSSIA 



Lunulicardium acitti rostrum Hall Lunnlicardinm sp. 



L. ornatum Hall 



L, libum Clarke 



L. wiscoyense Clarke 



L. accola Clarke 



L. clymeniae Clarke 



L. eriense Clarke 



L. hemicardioides Clarke 



L. furcatum Clarke 



L. velatum Clarke 



L. finitimiim Clarke 



L. sodale Clarke 



L, encrinitum Clarke 



L. pilosum Clarke 



L. bickense Holzapfel 



L. absegmen Clarke 



L. enode Clarke 



L. parimciilus Clarke 



L. beushauseni Clarke 



L. suppar Clarke 



L. (Opisthocoelus?) transversale Clarke 



Pterochaenia fragilis (Hall) Pterochaenia f ragilis (Hall) 



P. fragilis (Hall) var. orbicularis 



Clarke P. fragilis var. orbicularis Clarke 



P. sinuosa Clarke 

 P. perissa Clarke 

 P. elmensis Clarke 



