GRAPTOLITES OF NEW YORK, PART 2 33 



Tullberg [1882, p. 18] has distinguished in Scania three subzones of 

 that of Dicranograptus clingani Carruthers, the lowest of which alone car- 

 ries Climacograptus caudatus while the highest one contains 

 Leptograptus flaccidus, Diplograptus foliaceus and Cli- 

 macograptus bi co r n i s. It is, therefore, possible that his last subzone 

 already corresponds to our lower Utica shale. Olin has also lately recorded 

 [1906] the occurrence of G lossograp t us quad r i m uc ro n a t u s in 

 the Clingani zone in the neighborhood of Jerrestad in Scania and for 

 this reason has suppressed Tullberg's zone of G. quadrimucronatus. It . 

 therefore becomes quite probable that the boundaries of our Magog and 

 Utica shales do not exactly correspond to those of the zones of Climaco- 

 graptus clingani and Pleurograptus linearis. 



3 Utica shale (zone of Glossograptus quadrimucronatus and Climacograptus 



typicalis) 



The graptolite fauna of the Utica shale in New York and the adjoin- 

 ing areas of Canada and Ohio consists of : 



Callograptus compactus (Walcott) Corynoides curtus Lapworth 



Dictyonema arbuscula Ulrich id. var. comma nov. 



Mastigograptus tenuiramosus (Walcott) Diplograptus foliaceus mut. vespertinus 



M. simplex (Walcott) nov. 



M. gracillimus (Lesquereux) Glossograptus quadrimucronatus (Hall) 



M. arundinaceus (Hall) id. var. approximatus nov. 



M. circinalis nov. id. var. cornutus nov. 



Chaunograptus gemmatus nov. Glossograptus ? eucharis ( Hall) 



C. ? rectilinea nov. Climacograptus typicalis Hall 

 Leptograptus annectans (Walcott) C. putillus ( Hall) 

 Leptograptus flaccidus (Hall) C. bicornis Hall 



Pleurograptus linearis (Carruthers) Lasiograptus bimucronatus mut. timidus 



Dicranograptus nicholsoni Hopkinson nov. 



D. spinifer Elles 6° Wood 



This fauna is markedly different from that of the Normanskill shale of 

 New York and also well differentiated from that of the Maofoo- shale. Its 

 relict element from these preceding zones is very small. It consists of one 



