LOWER SILURIC SHALES OF THE MOHAWK VALLEY 6l 



Glossograptus quadrimucronatus mut. pertenuis Rued. 



Diplograptus aaiplexicaulis Hall (c) 



D. amplexicaulis var. pertenuis Rued. (c) 



D. (Mesogr.) putillus (Hall} (c) 



Climacograptus scharenbergi Lapworth (r) 



C. spiniferus Rued. (cc) 

 Plectambonites sp. 



Archinacella orbiculata (Hall) (c) 



Lepidocoleus jamesi H. & W. (c) 



The combined fauna of the Snake Hill beds, as known at pres- 

 ent, is : 



1 Dicranograptus nicholsoni Hopkinson 



2 Diplograptus amplexicaulis Hall 



3 D. amplexicaulis var. pertenuis Rued. 



4 D. (Mesogr.) putillus Hall 



5 Climacograptus scharenbergi Lapworth 



6 C. spiniferus Rued. 



7 Cryptograptus tricornis Carr. mut. insectifonnis Rued. 



8 Lasiograptus eucharis (Hall) 



9 Glossograptus quadrimucronatus Hall mut. pertenuis Rued. 



10 Corynoides calicularis Nicholson 



11 Dawsonia campanulata Nicholson 



12 Glyptocrinus sp. 



13 Heterocrinus ? gracilis Hall 



14 Cremacrinus sp. 



15 Schizocrinus nodosus Hall 



1 6 Carabocrinus cf. radiatus Billings 



17 Edrioaster saratogensis nov. 



1 8 Pontobdellopsis cometa Rued. 



19 Paleschara ulrichi nov. 



20 Pachydictya acuta (Hall) 



21 Lingula curta Conrad 



22 Leptobolus insignis Hall 



23 Pholidops trentonensis Hall 



24 Schizocrania filosa Hall 



25 Plectambonites sericeus typus (Sowerby) 



26 Plectorthis sp. cf. whitfieldi (N. H. Winchell) 



27 Dalmanella testudinaria (Dalman) 



28 Plaesiomys retrorsa (S alter) 



29 Plectorthis plicatella Hall 



30 Platystrophia biforata (Schlotheim) 



31 Rafinesquina alternata (Emmons) 



32 Clitambonites americanus (IVhitneld) 



33 Rhynchotrema inequivalve (Castelnau) 



34 Parastrophia hemiplicata Hall 



35 Cyclospira bisulcata (Emmons) 



36 Zygospira recurvirostris (Hall) 



