13. 
crassa. 
Descriptive Catalogue of the British Testacea. Jos 
Favanne Conch. t. 48. f. 3. 
Donovan Brit. Shells, t. 130. bene. V. borealis. 
Montagu Test. Brit. p. 68. t 2. f. 1,2. bene. 
Habitat in mari. 
Testa diametro 11 poll. feré orbicularis, alba, vix pellucida, striis con- 
centricis numerosis distinctissimis elatioribus recurvis, intus cretacea. 
Margo integerrimus, intus striis membranaceis longitudinalibus confer- 
tis. Umbones acuti, paululum prominentes. Differt a T. reticulata 
quod magis orbicularis et caret striis longitudinalibus. 
First figured by Petiver, who calls it ** 'Thread-girdled 
White Cockle.” It has been found plentifully in Corn- 
wall and Devonshire; and less frequently at Llaugh- 
arne, Caermarthenshire, by Mr. Montagu. 3 
T. testa subrotunda depressa, sulcis transversalibus 
numerosissimis, 
— Lister Conch. t. 299. T 136. 
Pennant Brit. Zool. À. t. 48. iid " 
Da Costa Brit. Conch. p. 194. t. 13. f. 4. dextra. Pect. 
ressior. xe 
depressio v 
- Linn. Gmel. p. $288. Venus crassa. | 
. Pulteney in Hutch. Dorset. p. 30. t 7. Jf 4. PE pu. | 
Montagu Test. Brit. p. 65. 
Donovan Brit. Shells, FÉ 103. T. Beide. 
D mari, 
e longa, 2 dés: colore. subalbido, in e " n fasciis rosaceis, 
"ule dentibus duo- 
: le E dentibus lateralibus - 
duobus. = 
First figured and described by Pennant. Found on 
~ the Cornish coast, by Da Costa; at Weymouth, Dor- — 
set, by Dr. Pulteney ; 5 and. on the Devonshire coast, by zt 
Mr. Montagu. | | 
nid ' Gelin 
