290 



side of Maud Island, referred to on pages 224 and 249 of the third part 

 of this volume. But, in the present state of our knowledge, P. Icevigata 

 can scarcely be regarded as a variety of P. suhcompressa, if the latter is 

 of Jurassic age. 



Cytherea (Caryatis) surtrigona, Whiteaves. 



Callista (?) suhtrigona, Whiteaves. 1876. This volume, pt. 1, p. 63, pi. 9, fig. 10. 

 Garyatis suhtrigona, Whiteaves. 1884. Ibid., pt. 3, p. 226. 



Bear Skin Bay, Skidegate Inlet, C F. Newcombe, 1895 : several speci- 

 mens. Three miles north-west from Yakoun Lake on the Rennel Sound 

 Trail : a right valve collected by S. Pearse in 1894, and loaned to the 

 writer by Dr. Newcombe in 1895. 



Thetis affinis, Whiteaves. 



Thetis affinis, Whiteaves. 1884. This volume, pt. 3, p. 226, pi. 30, figs. 4 and 4, a h. 



Three miles north-west from Yakoun Lake on the Rennel Sound Trail, 

 three casts of the interior of both valves, collected by S. Pearse in 1894 

 and lent to the writer by Dr. Newcombe in 1896. 



Cyprina occidentalis, Whiteaves. 



Cyprina occidentalis, Whiteaves. 1884. This volume, pt. 3, p. 227, fig. 10. 



Lina Island, Skidegate Inlet, C. F. Newcombe, 1897 : a cast of the 

 interior of both valves. 



Protocardia subsimile. (N. Sp.) 



Frotocardiuvi HiUanum, Whiteaves. 1884. This volume, pt. 3, p. 228, pi. 30, fig. 5. 

 But probably not Cardium Hillanutn, Sowerby, 1813. 



Shell small, regularly convex, ovately subtriangular, rather narrow 

 above, widening somewhat rapidly below, and nearly as high as long. 

 Anterior side short, subtruncated somewhat obliquely above and narrowly 

 rounded below : posterior side not much longer than the anterior, more 

 obliquely truncated above, rather more produced, and obtusely pointed 

 below : cardinal margin short, umbones moderately prominent : beaks 

 small, curved inward and forward, placed a little in advance gf the 

 midlength. 



Posterior area of both valves marked by minute radiating ribs, the 

 remainder of the surface with still more minute and densely crowded 

 concentric raised Knee. 



Dimensions of the only testiferous specimen that the writer has seen (a 

 right valve): length nine millimetres and a half ; height, inclusive of the 

 beaks, nine mm. 



