[TAYLOR] MARINE MOLLUSCA 53 



8AXICAVA, Bellevue. 



117. Saxicava rugosa, Linne, sp. 



Mi/filus rugosu.s, Linm-, Sjst. Nat., ed. xii.. vol. i.. pt . 2, p. H.tH, no. 249(17(i7). 

 Mya arcfica, Linne, op. cit., p. 1118, no. 32 (1707) 

 Solen yniniifns, Linne. op. cit., p. 1115, no. 42 (17(i7> 

 Mytilus pholadis, Linne, Mant. Plant., p. .54S <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. iii., p. 82) restricts the wArao pholadis. 



PANOP.EA, Menard. 



118. Panop.ka Norvegioa, 8[)engler, sp. 



Ml/a Nurvcgica, Sj)en^., Skrivt: .\at. Selsk.. vol. iii., p. 4H, pi. ii., tig. IS {lliU). 



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 b}- Dr. NewcomV»e and also by myself. 



119. Panoi'.ka gexerosa, Gould. 



Proc. Bo.st. Soc. Nat. Hist., vol. iii., p. 215, (May 1850); and P. S. Expl. Kxped., 

 Mollnsca, p. 385, fi^. 507-507b (1852). 



This large species lives at a considerable depth (more than two feet) 

 in the sand, and consequent!}' 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 b}^ Dr. Xewcombe and lately that gen- 

 tleman and Mr. Spreadborough discovered living specimens at Clayoquot 

 Sound. 1 believe that this species is more abundant in Puget Sound. 

 It also occurs on the Californian coasts. 



