113 
47.—Rhombic, longer than broad, rounded below, trans- 
parent, whitish with pale violet longitudinal interrupted 
striae, very thin and brittle, obliquely truncate at the 
top, with a few pale violet spots below; front margin 
meurved. 2...1. Scarborough. Probably the young 
of the W. Indian species, which, when mature, is in- 
ternally of a jet black. 
Grenus.—AVICULA. 
Inequivalve, fragile, with the dorsal edge straight and 
transverse, the extremities produced, the anterior 
one caudiform ; left valve emarginate, with a sinus 
or notch through which the beard passes ; hinge 
linear with one tooth in each valve under the beaks ; 
ligament linear and marginal placed in a long 
narrow groove. 
A. Hirunpo. Turt. B. p. 220. t. 16. f. 3,4.—F, 
p. 405.—Mytitus. H. Lin. 1159.—D. p. 320.— 
Turt. D. p. 108 f. 7.—dn. Ch. f. 724,5.?—An A. 
TaRENTINA. ? Lam.—Rather oblique, smooth or fur- 
nished with a few scales about the margin, dull greenish 
grey or brown with pale rays; tail rather elongated ; 
wing large and deep. Dublin Bay, Torbay and W, 
Coasts, rare, up to 2, - 
Trip—E.—PECTINIDES. 
Ligament tnternal or semi-tnternal, shell for the most 
