38 ROYAL SOCIETY OF CANADA 
shape, being at times very tumid and at other times much flattened. 
Fine specimens from Sooke measure 95 X 11 X 4 mm.; others, from 
Departure Bay, of a quite different shape, 9 X 9 X 6} mm. 
56. LUCINA 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 Stearns 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 L. borealis, 
Linne, and Jeffreys 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. 
57. DIPLODONTA ORBELLA, Gould, sp. 
Lucina orbella, Gould, Proc. Bost. Soc. Nat. Hist., vol. iv., p. 90 (November, 1851). 
Not common. I have only found dead shells which I dredged in 
Departure Bay, 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, Vancouver 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.” 
CARDIUM, Linne. 
58. Carpium NürTrazLi, Conrad. 
Jour. Acad. Nat. Sci. Phila., vol. vii., pt. 2, p. 229, pl. xvii., fig. 3 (1837). 
This species is now generally considered to be distinct from the 
Pectunculus corbis of Martyn with which Carpenter united it. It is a 


1 “Notes on the Mollusks 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. xv., 1892, as well as the earlier “‘ Geo- 
graphical Catalogue of Mollusca ” (1867), 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. 
