396 
MOLLUSCA. OSTREAD/Tl. 
Anomia. 
Turt, Linn. iv. 288. — A. cymbiformis, Maton and Rackett^ Linn. Trans, 
viii. 104. t. iii. f. 6. Mont. Test. Brit. Sup. 64 — A. cylin. Turt. Biv. 
Brit. 232. — On fuci and sertularise. 
Length about half an inch, breadth a quarter, narrower towards the beak, 
which curves over the under valve, and ends in an obtuse point ; sometimes 
smooth, but usually vrith some rough transverse marks, but no longitudinal 
ones. 
396. A. striolata. — Shell oval, somewhat cylindrically con- 
vex, and striate longitudinally, with the beak curved backwards. 
Turt. Biv. Brit. 233. — Boots of fuci. 
Besembles the last, but is marked with fine, rather remote, longitudinal 
raised lines. 
397. A. aculeata. — Shell orbicular, with numerous longitudi- 
nal prickly striae. 
Mont. Test. Brit. 157. t. iv. f. 5. Turt. Biv. Brit. 233. — On fuci and 
among rocks. 
Diameter about half an inch ; depressed, whitish prickles ; rounded above, 
concave, and somewhat concentrically disposed by the lines of growth ; under 
valve wrinkled concentrically ; seldom prickly. 
398. A. Jhrnicata. — Shell somewhat orbicular, and finely 
striate, the upper valve furnished with a vaulted chamber on the 
inside, under the beak. 
Lamk. Syst. vi. 228. TurL Biv. Brit. 234. t. xviii. f. 12, 13 — From Tor- 
bay, Dr Turton. 
Diameter about half an inch ; flat, white, margin sinuous ; longitudinal 
striae towards the margin, and fine regular transverse ones towards the point- 
ed beak ; inside silvery ; under the hinge is a large vaulted chamber, which, 
on one side, is much curved, and scaly on the outside ; perforation of the un- 
der valve round, and nearly closed. 
399. A. tuhularis. — Shell orbicular, with the perforation of 
the under valve entire, and forming a cylindrical tube.” 
Turt. Biv. Brit, ccxxxiv — On fuci. 
Shell about a quarter of an inch in diameter ; whitish, with the beak ter- 
minal ; the under valve has the perforation entire all round, and produced 
into a raised C3'^lindrical tube ; the plug of attachment is tendinous.” 
It is probable that several of the preceding shells may yet be reduced to the 
rank of varieties. In the mean time, we have followed the arrangement of 
Dr Turton. 
EXTINCT SPECIES. 
1. A. ^meato.—Suborbicular, convex; when old, contracted towards the 
beak ; longitudinally striated ; perforation of the lower valve circumscribed. 
’—Soiver. Min. Conch, t. ccccxxv.— -In London Clay. 
