[TAYLOR] MARINE MOLLUSCA 83 
SAXICAVA, Bellevue. 
117. SAXICAVA RUGOSA, Linne, sp. 
Mytilus rugosus, Linne, Syst. Nat., ed. xii., vol. i., pt. 2, p. 1156, no. 249 (1767). 
Mya arctica, Linne, op. cit., p. 1113, no. 32 (1767). 
Solen minutus, Linne, op. cit., p. 1115, no. 42 (1767). 
Mytilus pholadis, Linne, Mant. Plant., p. 548 (1771). 
Arctica is the earliest specific name for this shell, but it was applied 
by Linne to a variety while the name rugosus was given to the typical 
rock-boring form. Pholadis, a still later name, was given to another 
variety, which appears to be our commonest form, and this name is the 
one generally used in recent west coast lists. 
This shell is very widely distributed and common in this province, 
as throughout the world, occurring sometimes nestling at roots of sea- 
weed, sometimes attached by a byssus to the rocks in tide pools and 
sometimes in the burrows of Penitella. 
My two finest specimens have been taken in the last named 
station and measure respectively 55 x 25 x 25 and 48 x 25 x 25 mm. A 
narrow specimen measures 45 x 14 x 16 mm. These all belong to the 
variety that has the shell gaping widely in front and to which Jeffreys 
(Brit. Conch., vol. iil., p. 82) restricts the name pholadis. 
PANOPÆEA, Menard. 
118. PaxorxA Norveaica, Spengler, sp. 
Mya Norvegica, Speng., Skrivt. Nat. Selsk., vol. iii., p. 46, pl. ii., fig. 18 (1793). 
This is a rare species both in Europe and in America. In our 
province it is only known from small dead shells which have been 
dredged near Victoria by Dr. Newcombe and also by myself. 
19. PANOPEA GENEROSA, Gould. 
Proc. Bost. Soc. Nat. Hist., vol. iii, p. 215, (May 1850); and U.S. Expl. Exped.,- 
Mollusea, p. 385, fig. 507-507b (1852). 
This large species lives at a considerable depth (more than two feet) 
in the sand, and consequently is not easily obtained. Moreover it does 
not appear to be at all common on our coasts. Dead shells have been 
dredged at Victoria and Comox by Dr. Newcombe and lately that gen- 
tleman and Mr. Spreadborough discovered living specimens at Clayoquot 
Sound. I believe that this species is more abundant in Puget Sound. 
It also occurs on the Californian coasts. 
