NORTH SIDE OF THE BAY OF BISCAY, IN AUGUST, 1906. 365 



to the synonymy of this species in Forbes and Hanley's " History of 

 British Molliisca," 1855, vol. ii, p. 281, is a mistake, for this refers to 

 P. striatus, Miiller, and it is not surprising he found the synonymy 

 very complex and doubtful. I have not been able to find any mention 

 of P. sulcatus in Forbes and Hanley's work except J. Sowerby's fossil 

 variety of P. opercularis. 



The only identified specimens of this species I have been able to 

 inspect are in the National Collection, and with the exception that 

 they are richly coloured and somewhat larger and more solid than the 

 specimens under consideration, I can see no difference. 



The range of this species is considerable, and if we omit the Medi- 

 terranean locality given by Jeffreys as doubtful, it has been recorded in 

 the Atlantic from Norway and the Faroe Islands to the seas west of 

 the coast of the Soudan. 



Station XIII. 412 fathoms. One living, young; three dead valves of 

 various ages. 



^QUIPECTEN, Fischer. 

 ^quipecten opercularis (Linne). 



Ostrea ojoercularis, Linne, 1758. Syst. Nat., Mit. x, p. 698. 



Pecten opercularis, Montagu, 1803. Test. Brit., p. 145. 



Chlamys (jEquipecten) opercularis, P. Fischer, 1886. Man. Conch., 

 p. 944. 



Generally distributed in the European seas and Asiatic and African 

 coasts of the Mediterranean and off the Azores. From 5 fathoms 

 to 600 or more. Locard remarks that the shells dredged by the 

 Caudan were much smaller than usual, and the same can be stated of 

 the living shells under consideration, the largest of which measures 

 only 21 mm, by 20 mm. in breadth. The dead shells and fragments 

 show that the species attains a much larger growth in the same locality. 



Station I. 75 fathoms. One living (small). Three odd valves of 

 various sizes. 



Station II. 75 fathoms. One living, one dead, and an odd valve. 

 ,, IV. 109 fathoms. Four fragments. 



,, V. 109 fathoms. Many small living and dead and broken frag- 

 ments of larger shells. 



Station XI. 146 fathoms. One living (small), and two odd valves. 



Palliolum, Monterosato. 

 (1) Palliolum similis (Laskey). 



Pecten similis, Laskey, 1811. In Mem. AVerner Soc, i, p. 387, 

 pi. viii, fig. 8. 



