165 



This species is dedicated to the eminent American geologist and palae- 

 ontologist, Dr. J. S. Newberry. 



Locality and Formation. English Head, Anticosti ; on the south side 

 of the St. Lawrence, opposite Three Rivers ; and also at Point Rich, 

 Lake Huron. In the Hudson River group. The specimen represented 

 by fig. 148, 6, above, is from Junction Cliff, Anticosti, in Division 1, base 

 of the Anticosti group, Middle Silurian. It is not quite certain that this 

 latter is of the same species. 



Collectors. J. Richardson, R. Bell. 



Additional species from various localities. 

 CYRTIA MYRTEA. (N. sp.) 



Fig. 149. Fig. 150. 



Fig. 149. Cyrtia Myrtea. a, Ventral view ; 6, view of the area ; c, side view. 

 150. Charionella Hyale. a, side, and b, dorsal view. 



Description. Ventral valve pyramidal, much elevated; area large, 

 flat, at right angles to the plane of the margin ; beak acutely pointed, not 

 incurved ; foramen narrow, closed aH the way to the beak by a strongly 

 convex deltidium ; a shallow mesial sinus, which is gently concave, 

 commences at the front margin, with a width equal to a little more than 

 one-third the length of the hinge-line, and runs all the way to the beak, 

 where it diminishes to a point. The dorsal valve is sub-elliptical ; cardinal 

 angles slightly rounded ; sides gently convex and converging towards the 

 front margin ; the latter with a gentle concavity in the middle, formed by 

 the mesial sinus ; area small, lying in the plane of the margin. This 

 valve is gently convex, with an obscure depressed convex mesial fold. 



Surface with fine radiating striae, about 8 in the width of one line. 



Width on the hinge-line 7 lines ; length of dorsal valve 5 lines ; height 

 of ventral area 4 lines. 



Locality and Formation. South-west Point, Anticosti. In Division 4, 

 Anticosti group, Middle Silurian. 

 Collector. J. Richardson. 



