55 



Length, about two inches; height at the umbones, tenlines ; depth of a 

 single valve, six lines. 



Locality and Formation. — Indian Cove, Gasp<:i ; Gasp(? limestone, 

 No. 8. 



Collector.— "R. Bell. 



Anodontopsis ventricosa., (N. sp.) 



Fig. 24. Fig. 25. 



Fig. 24. — Anodontopsis ventricosa. Internal cast of left valve. 

 25. — Dorsal view of the same. 



Bescription. — Strongly convex, ovate ; height about two-thirds the 

 length. Anterior extremity with the most projecting point at a little 

 over one-third of the height, between which and the umbones the outline 

 is gently concave. Ventral margin rather strongly convex, deepest a 

 little in front of the middle, more abruptly rounded up to the anterior 

 than to the posterior extremity. Umbones large, rounded ; beaks closely 

 incurved ; hinge-line straight ; the anterior extremity situated at about two- 

 thirds the height ; thence sloping upwards and backwards to a point on 

 the dorsal margin a little behind the mid-length of the shell. Dorsal out- 

 line most elevated at the umbones, between which and the extremity of 

 the hinge-line slightly concave. Posterior extremity most projecting at 

 about the lower third ; above this point obliquely truncated, ascending to 

 the extremity of the hinge-line with a gently convex slope. 



Judging from the cast of the interior, the ligament in this species is 

 external. The dorsal margin behind the umbones is sharp, slightly com- 

 pressed, gently concave just below the^edge. 



Surface unknown. 



Length of the best preserved specimenjccllected, eighteen lines ; height 

 at the umbones, twelve lines ; depth of both valves, ten lines. 



Locality and Ftrmation. — Indian Cove,J Gasp(^ ; Gasj i!? limestone. 

 No. 8. 



Collccttr.—K. Tell. 



