24 



and 13, were engraved. The two small tubercles d, d, are the casts of 

 the two pits above mentioned. 



Fig. 12. 



Fig. 12. Part of ventral valve, shewing the deltidium, the dental strict on the area, and 

 the small pits d, d, of the divaricator processes. 



The surface in most of the specimens is covered with small, nearly 

 equal, rounded or sub-angular ribs, five to seven in the width of two lines. 

 In others there are about three ribs in two lines, with concave spaces 

 between equal to the ribs in size. 



Locality/ and Formation.--lndim Cove, Gaspd Bay; Gaspd limestone 

 No. 8. Also in the Oriskany sandstone in New York and in Ontario. 



Collectors.- -U. Bell, T. C. Weston. 



Strophlmena inequiradiata. 



Plate 2, figs. 4, 4a. 



Strophomena (Strophodonta) LVEQuiRADiATA, (Hall.) Tenth N. Y. Reg. Rep,, p. 113, 1857. 

 Strophodonta INEQUIRADIATA, (Hall.) Pal., N. Y., vol. 4, plates XL, XH., and XHI., 1867. 



Strophomena in^^quistriata, (Billings.) Canadian Journal, July, 1861. Geology of Canada, 



p. 367. 



Fig. 13. 



Fig. 13. — Strophcmena inequiradiata ; a, ventral valve ; b, longitudinal section. In general 

 the space between the two valves is not so great as in this latter figure. 



Description. — Semi-circular, semi-oval, or sub-triangular ; width on 

 hinge-line varying from one to three inches ; length from two-thirds to 

 seven-eighths of the width ; cardinal angles compressed, forming rounded 

 or acute ears which are more or less extended. Ventral valve varying 

 greatly in the amount and in the form of its convexity ; usually with|the 



