38 ROYAL SOCIETY OF CANADA 



Hhape, being ;it times veiy tumid and at other times much flattened. 

 Fine specimens from Sooke measure 9^ X H X 4 mm. ; others, from 

 Departure Hay, of a quite different shape, 9 X ^> X 6^ mm. 



56. 3.IUCINA AcuTiLiNEATA, Conrad. 



Small living specimens and larger dead ones have been dredged in 

 several localities from Victoria to Queen Charlotte Islands. Dr. New- 

 combe found the dead valves abundant on the shore at low water at 

 Clayoquot Sound 



In Whiteaves's papers this species appears as Lucina filosa, Simpson, 

 but vStearns has recently shown that the east coast species is different, 

 and that our shell should be styled Lucina acutilineata, Conrad. Dr. 

 Carpenter supposed this last to be a form of the European Xi. borealis, 

 Linne, and .leffreys could see no good reason for separating borealis and 

 jilosa. 



The three forms are nearly allied and, I should say, are at best 

 geographical varieties of one species. If they are to be united then 

 borealis is of course the oldest name. 



DIPLODONTA, Brown. 



5*7. DiPLODONTA ORBELLA, Gould, Sp. 

 J.urina orhella, Gould, Proc. Bost. Soc. Nat. Hi.st., vol. iv., p. !K) (November, 18.51). 



Not common. I have only found dead shells which I dredged in 

 Departure Ba}^, but Dr. Dawson obtained living specimens at the Queen 

 Charlotte Islands by dredging, and at low water at Malaspina Inlet, and 

 again between Nahwitti Bar and Quatsino Sound, Yancouver Island. 



Dr. Newcombe has. reported it as being found in mud at Comox and 

 Salt Spring Island. In California it is not uncommon and is found, 

 according to Mr. Orcutt,' " in holes in rocks or in dead bivalves."' 



CAEDIUM, Linne. 



58. Cardium Nuttalli, Conrad. 



.Jour. Acad. Nat. Sci. Phila., vol. vii., pt. 2, p. 220, pi. xvii.. Hg. 3 (l.s:^7). 



This Species is now generally considered to be distinct from the 

 Pecfunculus corbis of Martyn with which Carpenter united it. It is a 



' " Notes on the MoUu.sks of the vicinity of San Diego, Cal., and Todos Santos 

 Bay, Lower California,"' Proc. U. S. Nat. Mus., vol. viii., 1885. This paper and the 

 following : " Annotated list of shells of San Pedro Bay and vicinity," by Mrs. Bur- 

 ton Williamson, Proc. U.S. Nat. Mus.. vol. x v., 1892, as well as the earlier "Geo- 

 graphical Catalogue of Mollusca '" (1807), of Dr. J. G. Cooper, and the Monterey list of 

 the .same author (Amer. Jour. Conch., vol. vi., 1870), should be consulted for informa- 

 tion as to the southern range of our species. 



