42 ROYAL SOCIETY OF CANADA 



68. Tai'Es tenerrima, (iould and Carpenter. 



Froc. Zool. Soc. London, lS5(i, p. 200 : - Vrnus rigida, Gould (pars), 1S50. 



This tine species is not nearly so coniinon as the last named. I 

 have only found it in one locality, namely, Cadboro' Bay, near Victoria, 

 where it occurs in sand between tide marks. Dr. Newcombe has found 

 it in a similar situation at Clayoqnot Sound, 



In a systematic arrangement our nine species of fresh-water Corhi- 

 ciilidcv must be placed here. 

 They are : 



69. Sph.erium rhomboideum, ^ay. sp. 



70. ** TLTMiDUM, Baird. 



71. " Spokani, Baird. 



72. " Eaymondi, J. (r. Cooper. 



73. PisiDiLM VARIABILE, Prime. 



74. " ABDITUM, llaldeman. 



75. •' LLTRAMONTANUM, Prime. 



76. " sp. 



77. " sp. 



All of the above have been taken by myself on Vancouver Island, 

 except S. tumidum and S. Spokani, which were described by Baird from 

 localities on the mainland of British Columbia. 



SAXIDOMUS, Conrad. 



78. Saxidomus squalidus, Deshayes. 



Brit. Mn.s. Cat. of Veneridn'. p. 18S, no. 5 (1833). 



Very common everywhere between tides, and largely used b}'^ Indians 

 and others as an article of food. 



P1^:TRIC0LA, Lamarck. 

 79. Petricola carditoides, Conrad, sp. 



Saximra (■(ti-ditoides, Conrad, Jour. Acad. Nat. Sci. Phila., vol. vii., pt 2. p. 255, 

 pi. XX., fig. H (1837) ^ .sVr.*-. Cali/ornira, Conr., o)). cif., p. 236, pi. xx., 

 tig. 9. 



This is the name b}'^ which this shell has long been known, though 

 there appear to be several older ones, e.g.. nivea, Chem., rugosa, Shy., and 

 tenuis, Sby. 



Carpenter records it from Puget Sound (Kennerley) and Vancouver 

 Island (Swan). Jiichardson is said to have found four living specimens 

 at Victoria in 1875, and Dr. Newcombe obtained young specimens at 



