PECTEN. 65 



340 fathoms, in his recent sonndings off the west coast 

 of Ireland. In consequence of the specific name (sul- 

 catus) having been preoccupied by Born for a very dif- 

 ferent kind of scallop from Malabar, the name proposed 

 by Muller is inadmissible ; and Gmelin made a better 

 hit than nsnal in changing the name of the northern 

 shell to aratus. Lamarck carelessly applied the same 

 name of sulcatus to another species of Pecten which is 

 common in the Mediterranean. It is possible that the 

 P. 20-sulcatus of Muller may be a variety of his P. sul- 

 catus ; and in that case the first of these names ought 

 to be adopted in preference to that given by Gmelin. 



5. P. tigri'nus*, Muller. 



P. tigerimis, Mull. Zool. Dan. Prodr. p. 248, no. 2993. P. tigrinus, F. & H. 

 ii. p. 285, pi. li. f. 8-11. 



Body bright red or occasionally creamy- white : mantle 

 edged with white and mottled with dusky or brown rays : 

 cirri short : ocelli 10, brown with a golden centre : foot white 

 and very flexible : byssus transparent. 



Shell of the same shape as the last two species, but rather 

 narrower at the back, moderately solid, and somewhat glossy : 

 sculpture, extremely fine and numerous impressed striae, which 

 radiate from the beak and gradually diverge to the front and 

 side margins ; these striae are not visible to the naked eye, and 

 under a strong magnifier they appear regularly but slightly 

 punctured in consequence of the intersection of equally minute 

 and close-set transverse striae, which follow the line of growth ; 

 the longitudinal striae are sometimes irregularly waved or 

 interrupted, and are often forked: colour yellow, brown, or 

 purple, and now and then white, with variously disposed 

 bands, streaks, blotches, spots and other markings of those 

 hues : margins rounded in front, so as to form a semicircle, 

 and sloping from near the middle to the beaks at an angle of 

 about 45 degrees ; the front margin is sometimes folded in- 

 wards and strongly notched ; the upper part of the slope below 



* Barred like a tiger. 



