EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA Io7 



the anterior course of the margin is much more direct, curving outv/ardly 

 below and slightly incurved above. The anterior wing is very small, sepa- 

 rated from the umbones by a deep sulcus. The ligament area is very broad 

 and is longitudinally lined. The ornament lines of the surface consist of 

 distinct concentric lamellae, becoming more closely arranged near the mar- 

 crins. Their interspaces are crossed and the lamellae themselves notched or 

 crenulated by subequally distant elevated radial lines. The reticulated and 

 fimbriated effect is specially shown on the posterior wing. Our specimens 

 show the following dimensions: Length on hinge, lOO mm, hight and 

 length of body, 90 mm. 



Locality. From the lower beds, Cape Rosier Cove. 



Modiomorpha varia Billings (sp.) 



For description see p. 115 



Specimens here are like the smaller of those from the Grande Greve 

 beds but are seldom well preserved. 



Locality. Lower beds. Cape Rosier Cove and at the Grande Cavee. 



Goniophora mediocris Billings 



For description see p. i6i 



I am disposed to identify with this species from the Grande Greve 

 limestone, shells somewhat narrower and more elongate from the upper beds 

 of Cape Rosier Cove and probably also from the Grande Cavee. 



Leptodomus canadensis Billings 



For description iee p. 160 



Specimens much better than any seen from the Grande Greve lime- 

 stones occur at this horizon. 



Locality. The lower beds of Cape Rosier Cove ; probably at the 

 Grande Cavee. 



Mytilarca nitida Billings 



For description see p. 159 



Rather poorly preserved examples occur in the argillaceous limestones. 

 Locality. Lower beds. Cape Rosier Cove. 



Palaeopinna flabellum Hall 



See p. 159 



This is one of the more common of the species, similar in all respects 

 to the specimens in the Grande Greve limestone, even bearing the Crania 

 (C. grandegrevensis) which accompanies the latter. 



Locality. Lower 70 feet, Cape Rosier Cove. 



