12 



S. PLANUMBONA, Hall. — Charleton Point and at the west end of the 

 island ; H. R. Also at Junction Cliflf; Div. 1, A. G. 



S. ALTERNATA, Conrad. — A variety of this species occurs at several 

 localities ; H. R. Also throughout the A. G. 



Genus Leptaena, Dalman. 



L. SERICEA, Sowerby. — Abundant in the H. R. and also in Div. 1, 

 A. G. 



Genus Orthis, Dalman. 



0. TESTUDINARIA, Dalman. — A variety occurs at Marsdle Cliff; H. R. 



0. SUBQUADRATA, Hall. — Abundant at Charleton Point, and more rarely 

 at English Head and the west end of the island ; H. R. 



0. LYNX, Eichwald. — Charleton Point; H. R., rarely; abundant at 

 Junction Cliff; Div. 1, A. G. 



0. Maria, B., Pal. Foss., vol. i, p. 137. Macasty Bay ; H. R. Also 

 more abundantly at Gamache Bay ; Div. 1, A. G. 



0. SOLA, n. sp. — Shell small, nearly circular ; width a little greater 

 than the length ; sides and front uniformly rounded ; hinge line a little more 

 than half the whole width ; both valves convex and without either fold or 

 sinus. Ventral valve rather strongly convex, most tumid at about one- 

 fourth the length from the beak ; scarcely at all compressed at the cardinal 

 angles ; area forming an angle of about 100° with the place of the margin 

 in the basal third of its height, and, in the other two-thirds, incurved so 

 as to become parallel with that plane near the beak ; the latter minute and 

 pointed; foramen scarcely as wide as it is high; dorsal valve uniformly 

 convex ; greatest elevation a little above the centre ; cardmal angles slightly 

 compressed ; area two-thirds the height of that of the ventral valve, 

 inclined at an angle of about 110*^ with the plane of the lateral margin ; 

 slightly concave ; beak small, pointed, incurved ; foramen filled with the 

 divaricator process. Surface with fine acutely angular ribs, dividing sev- 

 eral times between the beak and the margin, about five in the width of 

 one line. Length 4i lines ; width about five fines ; length of the hinge line 

 3 lines ; distance between the dorsal and ventral beaks f of a fine ; depth 

 of both valves 2i lines. Salmon River ; H. R. J. Richardson. 



Genus Rhynchonella, Fischer. 



R. capax, Conrad. — Abundant at Charleton Point ; more rare at English 

 Head, Macasty Bay, and other locafities ; H. R. 



