LOWER SILURIC SHALES OF THE MOHAWK VALLEY 49 



Diplograptus vespertinus Rued. 

 Climacograptus bicornis miit. ultima twz'. 



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 & Riiedemann ^ 



E. megalops C. & R. 



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



Eusarcus triaugulatus 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 \'espertinus, Climacograp- 

 tus typicalis, Lasiograptus eucharis, Lep- 

 tobolus insignis, Trocholites ammonius- 



1 The eurypterids are described and figured in the forthcoming Memoir 

 on the Eurypterida of New York by Clarke and Ruedemann. 



-Trocholites ammonius Hall is a form that prol)ahly 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. 



