OSTREA. 
123 
ture half-moon shaped; the outer-lip thin and entire; 
pillar-lip broad, white, transverse, furnished with five or 
six small teeth on the edge: diameter hardly the eighth 
of an inch. 
Of this beautiful little shell we found several specimens 
among the sand at Seafield, in the west of Ireland, on the 
Atlantic: very rare, v.m. 
OSTREA. 
Shell with generally two unequal valves : hinge 
without teeth, but furnished with a hollow in the 
middle, and mostly lateral transverse grooves. 
A. The valves furnished with car-like appendages, and 
generally ribbed. Scallop. 1 to 11. 
B. Without ears , and generally rough on the surface. 
Oyster. 12, 13. 
* 1. Ostrca maxima. Great Scallop. 
Lister y pi. 163. f. 1— Pennant , pi. 62— Da Costa , pi. 9. 
f. 3— Donovan , pi. 49.— Dorset Cat. pi. 9. f. 3. 
Shell with fourteen or fifteen rounded ribs, which are 
grooved longitudinally, and finely striate transversely be¬ 
tween the ribs; the upper-valve flat nnd white, with a de¬ 
pression near the hinge of a rufous color; lower valve 
white with a yellowish tinge, very finely and regularly stri¬ 
ate longitudinally; inside whitish, with a broad deep-pur¬ 
ple margin: ears large, equal, striate in a decussate man¬ 
ner : length five inches; breadth nearly six. 
Variety. Beautifully marked on the flat valve, with red, 
yellowish white, and deep chocolate-brown, generally 
disposed in transverse bands; and some deep chocolate 
lines on the ears. 
At the mouths of rivers : the variety has been taken, we 
believe, only at Weymouth and Exmouth, v. v. 
* 2. Ostrea Jacoham. Pilgrim Scallop. 
Lister , pi. 1G5. f. 2, and pi. 166. f. 3— Pennant , pi. 63. 
f. 1— Donovan, pi. 137— Dorset Cat. pi. 13. f. 2. 
Shell with seventeen or eighteen somewhat angular ribs; 
the 
