Pvn H,i I'UitlS

340 fathoms, in his recent soundings
PECTEN. 65
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
bv Miiller is inadmissible : and Gmelin made a better
hit than usual 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 Miiller 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*, Miiller.
P. tigerinv.s, Mull. Zool. Dan. Prodr. p. 248, no. 2993. P. tigrinus, F. & H.
ii. p. 285, pl.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, bnt 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 fine 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 inwards
and strongly notched ; the upper part of the slope below
* Barred like a tiger.