GKAPTOLITES OF NEW YORK, I'AUT 1 



585 



Fig.18 Callogrraptus 

 saltcri Hall. Afraf?ment 

 with lateral views of thecae. 

 Deep kill, x 5.25 



Hall states tliat his originals came from the Quebec group at Grros 



Maule in Canada. As we also find D i c h o g r a p t u s o c t o b r a c h i a t u s , 

 T e t r a g r a p t u s s e r r a , D i d y m o g r a p t u s c o n- 

 s t r i c t u s and Callograptus elegans recorded 

 from that locality, the Tetragraptus horizon, or a sub- 

 horizon close to it, is probably exposed there ; and this 

 species occurs, hence, there at about the same level as 

 here. Gurley has, indeed, observed both species, C. 

 s a 1 1 e r i and C . elegans, only in the " Main Point 

 Levis zone," which is the Tetra- 

 graptus zone, Lap^vorth and Ami 

 have not noticed this form among 

 the collections of the Canadian Geo- 

 logical Survey. Hopkinson and Lapworth identified 



graptolites from the Middle Arenig of Whitesand 



bay, St Davids, Wales, with C. salteri and C. 



el egans. 



Prof, H. F. Cleland has sent me a quite poorly 



preserved graptolite from the Beekmantown beds at 



Tribes Hill, in the Moha\vk valley^ which appears to be 



identical with this species. 



Remavhs. While fragments, found in the Deep kill 



shales, indicate that the branches attained the length and 



width observed by Hall in the material from Gros Maule, 



none of the specimens approach the robust character of 



the specimens figured undei* this specific designation by 



Hopkinson and Lapworth as coming from the Middle 



Arenig of Whitesand bay in Wales. 



Hall described this form as having a flabelliform 



rhabdosome, but stated under the generic description 



that it is possible that some of the species of this genus may ha\'e grown 



in funnel-shaped rhabdosomes as Dictyonema. The specimen of C . s a 1 • 



Fig.l9 Callograptus 

 salteri Hall. Enlargeraent 

 of poi'tion of rhabdosome to 

 show the thecal apertures. 

 Deep kill, x 5.25 



