39 
q ANOMIA. 
EXERIC CHARACTER: Valves of the shell unequal, 
l ' re gular, operculated, adhering by the operculum; 
ll 'aller valve perforated, usually flat, liaving a hole close 
0 lbe beak ; the other valve larger, concave, entire. Oper- 
Bu ' Ur,) small, elliptical, bony, connected with the internal 
p Usc le, and fixed to solid bodies. 
a , |°P e >'!y speaking, the perforated valve is to be regarded 
file le , lower one. And beside the muscular attachment of 
«xt ' Ull . nia * lo operculum (which is only the thickened 
i ' e <"ity of the tendon) the two valves are connected by an 
» , er cardinal ligament. 
EPHIPPIUM. Turt. Lin. Pen. Brit. Zo., vol. 4, 
p ' *(-• Mont. Test. Brit., vol. 1, p. 155. Flem. Brit. An., 
w ' ' J ^o. Common. The largest specimens I have seen 
* A fir °' ^ rom P' nnaB > ' n d ee P water. 
s ' ^EPJE. Flem. Brit. An., p. 395. This well marked 
0 |T Cles seems to have been overlooked or confounded with 
J . er s ; from which it may be distinguished by its size, 
ill J 0 * 1 ' s ^ roln nne an< * b ®lf t0 two * nc * les length, by its 
delated form, and by its colour ; being of a pale red, 
. b yellow , in broad, faint, irregular stripes: much re- 
^•nbling an outer layer of the coats of an onion ; whence 
« name. It is not uncommon, on rocks or the carapace 
* a ^' rus taceans. 
p S QUAMULA. Turt. Lin. Pen. Brit. Zo., vol. 4, 
aV° 9 ‘ Mont - * est - Brit *> vol. 1, p. 156. Fiein. Brit. 
s ta'’ Common, attached to every kind of sub- 
b e D( : 0 ' Montagu was inclined to suppose that this might 
8 ( ai 16 satae as ll* e fwo last named species in their early 
dig; 6 ( v ol. 2, p. 581), founding his remark chiefly on the 
lsj of distinguishing them, and indeed the remaining 
Mai. S ’ wben young. It uinst be admitted that at this 
a C<f S - ^' sl ' nct ‘ oa * s not always easy ; but their appear- 
* A tT S ver y different when fully grown, 
p,' y^DLfLATA. Mont. lest. Brit., vol. 
1 fisr. 6. Flem. Brit. An., p 
1, p. 156, 
O st * 5 6. Flem. Brit. An., p. 395: — who supposses 
n !0(l ea Striata of Montagu to be the same species. Com- 
A, l ‘ )ou gh scarcely abundant. 
p, j .^ULEATA. Turt. Lin. Mont. Test. Brit., vol. 1, 
* A. A, fig. 5. Attached to sea-weeds. 
A, r, '(^CTATA. Flem. Brit. An., p. 395. Common. 
A. EIA'DRICA. Flem. Brit. An., p. 395. Common. 
d es ,^ATA. Nobis. This, which 1 suppose to he un- 
is a minute species, the diameter of the disk 
th„ 8 abo «t ' 
Valve 
the tenth of an inch. The form is circular. 
ra C i er “‘ Ves smooth and regular; but it is especially cha- 
‘zed by the elevation of its centre ; which is almost 
