104 
incurved and approximate; inside white or whitish ; 
epidermis velvety. 1%. W. Coasts. 
P. Decussatus. Turt. B. p. 173. t. 12. f. 5.—F- 
p. 400.—Orbicular, depressed, with numerous fine 
raised decussated lines which are clothed with a short 
silky brown pile, yellowish white with purple and crim- 
son clouded patches, which are often disposed in ziczac 
angles ; inside glossy white, the disc often stained with 
dark red, margin very strongly serrated. 1. British 
Channel. 
P. Nummarius. Turt. B.p. 174. #. 12. f. 6.—F. 
p. 400.—AroaN, Lin. 1143 ?—Lnst. t. 239. £.81.— 
Lenticular, very finely decussated, yellowish white or 
cream-color, with numerous round red dots (which very 
rarely become confluent about the margin and form 
short lines); beaks tumid and prominent, causing the 
margin on each side of them to appear a little projecting 
1 
or as it were slightly eared like a Pecten. =. Guernsey 
and Torbay. 
Genus.—NUCULA.” 
Oval-triangular or oblong, equivalve, inequilateral, 
closed; the beaks approximated : hinge with an 
oblique projecting spoon-shaped tooth in each valve, 
