EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 141 



Nuculites fraxinus nov. 



Plate 3 ;, figures 1-4 



This shell is small and slender, distinguished from N. do to by its 

 rapidly tapering and extended form, complete absence of the posterior 

 clavicle and much more finely toothed hinge. Body of shell not constricted ; 

 surface with fine concentric lines as usual in this group of shells. 



Mytilarca sp. 



Shells of this genus occur with some frequency but their specific values 

 are still obscure. 



Carydium gregarium Beushausen 



Plate 33, figures 11-14 

 Stt p. 33 



On a previous page I have noted the presence of this Coblentzian 

 genus and species in the Dalhousie beds. It has been interesting to find 

 this species in the Pine Hill deposits with its peculiar hinge structures as 

 described by Beushausen sharply defined ; a small anterior subumbonal 

 tooth and a long curving postumbonal denticulate riclge passing outwardly 

 into a deep socket ( in the left valve ) and beyond this a narrow ligament area. 



Goniophora cercurus nov. 



Plate 33, figures 18-22 



This is a shell of average size in which the exterior is covered with 

 sharply elevated crowded, more or less confluent concentric lines, the 

 umbonal ridge, angular in early growth, becoming obscure toward the mar- 

 gin. Internal casts lose the ridge and present the aspect of Modiomorpha 

 with simple linear ligament area and hinge, well defined anterior and poste- 

 rior muscle scars and a visceral surface quite invariably marked by strong 

 broken or continuous radial lines extending to the position of the pallial scar. 



Macrodus ? desuetus nov. 



Plate 33, figures 15-17 



A species of rather large size for the genus, with elongate quadrangular 

 shape, broad low median umbonal cincture, broadly elevated concentric 

 growth bands, carries the hinge structure of Macrodus. 



Lunulicardium ? sp. 



Plate :^, figure a j 



In the Gaspe sandstone occurs a species which lias been described as 

 Lunulicardium ? convexum [see this memoir, pt 1, p. 234, pi. 23, 



