LOWER SILURIC SHALES OF THE MOHAWK VALLEY 49 



Diplograptus vespertinus Rued. 

 Climacograptus bicornis mut. ultima nov. 



C. typicalis Hall 

 Lasiograptus eucharis (Hall) 

 Crinoid joints 

 Taeniaster schohariae nov. 

 Lingula rectilateralis Emmons 

 Leptobolus insignis Hall 

 Dalmanella testudinaria (Dalman) 

 Rafmesquina ulrichi James (typical) 

 Plectorthis plicatella Hall 

 Orbiculoidea sp. 



Conularia trentonensis Hall var. multicosta nov. 



Serpulites sp. 



Saffordia ulrichi nov. 



Cyrtolites cf. ornatus Conrad 



Cyrtoceras sp, nov. 



Spyroceras bilineatum (Hall) 



Trocholites ammonius Conrad 



Triarthrus becki (Green) 



Isotelus gigas Dekay 



Trinucleus concentricus Eaton 



Primitia 



Eurychilina cf. subrotunda Ulrich 



Eurypterus pristinus Clarke & Ruedemann l 



E. megalops C. & R. 



E ? (Dolichopterus?) stellatus C. & R. 



Eusarcus triangulatus C. & R. 



E ? longiceps C. & R. 



Dolichopterus frankfortensis C. & R. 



D. latifrons C. & R. 

 Hughmilleria magna C. & R. 

 Pterygotus nasutus C. & R. 

 Stylonurus ? limbatus C. & R. 



The dominant elements of this large fauna are certain Canajo- 

 harie and Utica shale species on one hand, and the eurypterids on 

 the other. The former elements are the species of Mastigograptus, 

 Diplograptus vespertinus, Climacograp- 

 tus typicalis, Lasiograptus eucharis, Lep- 

 tobolus insignis, Trocholites 



1 The enrypterids are described and figured in the forthcoming Memoir 

 on the Eurypterida of New York by Clarke and Ruedemann. 



2 Trocholites ammonius Hall is a form that probably occurs 

 entirely or mainly below the Utica in the Canajoharie shale. Its type locali- 

 ties (title 3, p. 309) are the East Canada creek, Canajoharie and Cold- 

 spring, all three localities of shales older than the Utica. 



