Venus. MOLLUSC A. VENERID/E. 447 



Diameter sometimes reaching two inches and a half; bi'ownish or yellow- 

 ish white, with faint red rays. It is much more compressed tlian either of 

 the preceding, especially towards the ventral margin, and the depressed space 

 at the ligament more distinctly marked on the right valve. 



523. \ . fasciata. — Compressed, with remote rounded smootli 

 transverse ribs. 



"V. paphia, Pult. Dorset. 33. Mont. Test. Brit. 110.— V. fasc. Don. Brit. 

 Shells, V. 170. Txirl. Biv. Brit. 140. t. viii. f. 9 — Not uncommon from 

 Devon to Zetland. 



Diameter about an inch ; colour reddish, with darker rays ; beaks i)ronii- 

 nent ; depression before the beaks much raised in the middle ; dorsal margin 

 behind the beaks sloping rapidly ; ridges sometimes divided into groups hy 

 distant deeper furrows. — This species has been frequently confounded with 

 V. Paphia of Linn?eus, a West Indian shell, from which, however, as has been 

 well observed by Donovan, it differs in the structure of the concentric ridges, 

 which, in V. Paphia, " are remarkably thick and pi-ominent in the middle, but 

 in approaching each extremity, become suddenly obtuse, and are then conti- 

 nued in an attenuated ridge." 



524. V. canccllata. — Shell round, heart-shaped, angular on 

 the posterior side, with remote transverse plates, whicli are close- 

 ly cancellated, and the impression before the beaks heart-shaped. 



Linn. Syst. i. 1130. Turt. Biv. Brit. 144. t. x. f. 3.— Shores of Guernsea. 

 Diameter about half an inch ; Avhite, with sometimes a rosy tinge ; beaks 

 prominent ; ridges nine or ten, remote, membranaceous, slightly tubercled 

 posteriorly, the interstices with close set rib-like longitudinal ridges. 



525. V. suhcordata. — Subcordate, slightly truncated anteal- 

 ly ; with strong longitudinal costated stria?, and remote transverse 

 ridges. 



Mont. Test. Brit. 121. t. iii. f. 1. Turt. Biv. Brit. 144 Found by Mon- 

 tagu in sand from Falmouth Harbour. 

 Diameter a quarter of an inch ; white, strong ; the decussations are long 

 squares ; the beaks turning inwards, and much incurvated ; cartilage margin 

 smooth, sloping rapidly. 



526. V. granulata. — Shell suborbicular, granularly reticula- 

 ted, by the longitudinal ribs being crossed by rather sliallow 

 concentric grooves. 



Don. Brit. Shells, t. Ixxxiii. Moni. Test. Brit. 122. Turt. Biv, Brit. 

 144. — Shores of Devon and Cornwall and Frith of Forth. 



Length |ths of an inch, breadth 1 inch ; thick ; white, with purple blotches; 

 beaks prominent. 



527. V. Dysera. — Subtriangularly heart-sliaped, remote con- 

 centric ridges, with longitudinal striae in the interstices and 

 slightly marking the ridges. 



Pectunculus maculatus, List. Conch, t. cclxxvii. — V. Dys. Linn. ^ysi. i. 



1130. Mont. Test. Brit. Sup. 42. Turt. Biv. Brit. 147. t. ix. f. 4 



Frith of Forth, ]Mr Laskey. — Shores of Guernse}', Dr Turton. 

 Diameter about an inch; white, variously marked with brown; ridges 

 about twelve in number; beak small, inclining with a depression at both ex- 

 ti-emities. 



