42 



NEW YORK STATE MUSEUM 



contribute to a knowledge of the zonal distribution of the species. 

 Of this condition we know little; probably variations in range 

 are so slight that the effort to ascertain them would produce a 

 result in no way commensurate with the labor involved. 



The student may expect to find in the Onondaga limestone of 

 this district the following species : 



Fishes 

 Machaeracanthus peracutus New- 



j}erry 

 M. sulcatus New'berry 

 Onychodus sigmoides Newl)erry 



Crustaceans 



Acidaspis callicera Hall & Clarke 

 Beyrichia subquadrata Jones 

 Bollia bilobata Jones 

 Cyphaspis diadema Hall d Clarke 

 C. hybrida Hall & Clarke 

 O. minuscula Hall 



C. stephanophora Hall & Clarke 

 Dalmanites aegeria Hall 



D. anchiops Green 

 D. bifidus Hall 



D. calypso Hall 



D. coronatus Hall 



D. diurus Ch^een 



D. myrmecophorus Green 



D. pygmaeus Hall d Clarke 



D. selenurus Conrad 



Eurychilina? reticulata JJlrich 



Leperditia cayuga Hall 



Lichas contusus Hall & Clarke 



L. dracon Hall & Clarke 



L. eriopis Hall 



L. gryps Hall & Clarke 



L. hispidus Hall & Clarke 



Moorea kirkbyi Jones 



Falaeocreusia devonica Clarke 



Phacops bombifrons Hall 



P. cristata var. pipa Hall & Clarke 



Phaethonides gemmaeus Hall & 



Clarke 

 P. navicella Hall & Clarke 

 Primitia clarkei Jones 

 Proetus clarus Hall 

 P. crassimarginatus Hall 

 P. folliceps Hall d Clarke 



P. microgemma Hall d Clarke 

 P. ovifrons Hall d Clarke 

 P. stenopyge Hall d Clarke 

 P. verneuili Hall d Clarke 

 Turrilepas cancellatus Hall d Clarke 

 T. flexuosus Hall d Clarke 



Cephalopods 



Cyrtoceras citum Hall 



Gomplioceras absens Hall 



G. eximium Hall 



Gyroceras cyclops Hall 



G. laciniosum Hall 



G. matheri Conrad 



G. trivolve Conrad 



G. undulatum Vanuxem 



Orthoceras geneva Clarke 



O. inoptatum Hall 



O. profundum Hall 



O. sceptrum Hall 



O. thoas Hall 



Pteropods 

 Hyolithiis ceratophilus Clarke 

 II. ligea Hall 

 Tentaculites scalariformis Hall 



Gastropods 

 Bellerophon curvilineatus Conrad 

 B. pelops Hall 

 Callonema lichas Hall 

 Diaphorostoma lineatiim Conrad 

 D. turbinatum Hall 



D. unisulcatum Conrad 

 Euomphalus decewi Billings 



E. laxus Hall 

 Loxonema laxum Hall 

 L. pexatum Hall 



L. robustum Hall 

 L. sicula Hall 



Murcbisonia intercedens Hall 

 Maticopsis compacta Hall 



