4 ANOMIA. B 0 JVL-SHELL. 
5. Anomia aculeata. Prickly Bowl-shelL 
Montagu, pi. 4. f. 5. 
Shell roundish, or inclining to oblong, sometimes 
wrinkled, thin, transparent; the upper valve flat, covered 
with concave scales disposed in longitudinal rows, which 
enlarge towards the margin, with a small and somewhat 
inflected beak; lower-valve scaly, smooth, or a little spi¬ 
nous towards the margin: color dirty white, brownish 
or yellowish, silvery within- the perforation near the 
binge : diameter about a quarter of an inch. 
la the many specimens wnich we have examined from 
the English and Irish coasts, both loose and attached to 
the roots of Fuci, we have never been able to observe the 
numerous rows of concentric pores on the under-valve 
mentioned by Mr. Dillwyn, but have often found this vahe 
prickly for the greater part of its surface. 
Southern coasts of England and Ireland, v. v. 
6 . Anomia undulata. Striated BowUshell. 
Lister, pi. 2 02. f. 36, and pi. 203. f. 3 7—Montagu, pi. 4. 
f. 6 —Dorset Cat . pi. 11. f. 4. 
Cstrea striata. Da Costa , pi. 11. f. 4— Donovan, 
pi. 45. 
Shell roundish, more or less inclining to oblong, rather 
flat, thin and transparent; the upper valve somewhat 
fiexuous and.produced on one side under the hinge, like the 
valves of th e Tellinaflexuosa, with longitudinal ribs, which 
in the young shells are regular and quite straight, but in 
the older ones more or less undulated and branching into 
each other or divided, especially towards the front, giving 
the margin a notched appearance 5 the interstices trans¬ 
versely rugged or striate: beak small, pointed, scarcely 
reaching to the margin ; under-valve thin, flat, scaly, and 
ribbed, with an oval perforation under the hinge: color 
whitish or brownish, with more or less of a purple red or 
yellow cast, and iridescent when the outer coat is rubbed 
off; inside ribbed, glossy, with usually a dull oblong chalky 
patch below the hinge : length an inch or more 5 breadth 
not so much. 
On the English and Irish coasts, r. v. 
7. Anomia 
