346 GINGLYMACONCHA. PECTINID. 
This species is generally very much distorted, which arises 
from its residing in fissures of rocks, into which it enters at a 
young age, and there remains until full-grown: it is sometimes 
found in sand; their form is then much more regular. 
t is not uncommon on the western coasts, at Milton Sands, 
Dawlish, Salcombe, Torbay, and has been found in the Plymouth 
Sound, where it is very abundant, in Eschara foliacea, by Mr. 
J. Cranch. 
Shells higher than long ; the left valve sculptured with obso- 
lete divaricating ribs ; the right valve rather fiatter, its 
notch ciliated with small spines ; the auricles unequal. 
5. PECTEN OBSOLETUS. 
Shells sculptured with concentric and divaricating striz, 
hence reticulated; their angles granulated ; the anterior auri- 
cle sculptured with horizontal rays; the interstices radiated. 
The epidermis whitish, grey, pink, pale violet, purplish-brown ; 
red or reddish, simple or radiated ; variegated or punctulated 
with purple brown, pink, violet or pale red. Length seven- 
eighths of an inch; height one inch. 
Pecten obsoletus, Penn. Brit. Zool. iv. 102. t. lxi. f. 66; 
Donov. Brit. Shells, t.i.f. 2; Mont. Test. Brit. 146. Suppl. 
597; Plem. Edinb. Encycl. vii. 98. 
Pecten parvus, Da Costa, Brit. Conch. 153. 
Ostrea obsoleta, M. §& R. Trans. Linn. Soc. viii. 100; Turt. 
Conch. Dict. 133. 
Pecten levis, Penn. Brit. Zool. iv. 67 ; Mont. Test. Brit. 150. 
E Iwod a4. . 
Ostrea levis, M. §& R. Trans. Linn. Soc. viii. 100. t. iii. f, 5? 
Turt. Conch. Dict. 1317? 
Ostrea similis, Laskey, Trans. Wern. Soc. i. t. viii. f. 8. 
This species occurs but rarely in the English seas, but is 
not uncommon in the Scotch seas, inhabiting deep water ; it is 
occasionally taken by the dredge, or is thrown on shore by 
storms; but it is most frequently found plentifully in the sto- 
