448 MOLLUSCA. VENERID^. Venus 



528. V, rugosa. — Subtriangularly heart-shaped, with numer- 

 ous concentric sharp ridges. 



Penn. Brit. Zool. iv. t. lvi. f. 50. — V. cancellata, Don. Brit. Shells, t. cxv- 

 —V. laminosa, Laskey, Wern. Mem. i. 384. t. viii. f. 10 — Mont. Test. 

 Brit. Sup. 38 — Turt. Biv. Brit. 148. t. x. f. 4.-^.Various parts of the 

 coast. 



Length about an inch, breadth an inch and a quarter ; colour white, tinged 

 with brown ; the margin of the ridges thin, slightly waved, and faintly striated 

 on the distal side. 



— 529- V. Galllna. — Subtriangularly heart-shaped, with numer- 

 ous glossy, transverse, rounded ridges, with sharp reflected edges. 



Pectunculus fuscus, List. Conch, t. cclxxxii. — V. Gal. Linn. Syst. i. 1 130. 

 — V. rugosa, var. Perm. Brit. Zool. iv. 95 — Venus striatula, Don. Brit. 



Shells, t. lxviii. Mont. Test. Brit. 113 V. Gal. Turt. Biv. Brit. 149. 



t. ix. f. 2. — Sandy shores, common. 



Diameter about an inch ; yellowish-brown, with two or three pale rays, and 

 numerous zig-zag streaks ; the ridges are sloping externally, with the proxi- 

 mal edge low and sharp. It differs from the preceding, besides the form of 

 the ridges, in being more tumid, the cartilage slope not so straight, and the 

 depression in front of the beaks not so much produced. 



530. V. pallida. — Triangularly heart-shaped ; slightly pro- 

 duced retrally, with obscure transverse parallel ribs crossed by 

 fine close longitudinal lines. 



Turt. Biv. Brit. 150. t. x. f. 5 Found at Dowlish. 



Length about an inch, breadth nearly two ; thin, semitransparent ; yellow- 

 ish-white; beaks prominent, pointed, the slopes on each extremity smooth ; 

 margin thin. 



** Margin plain, 



531. V. undata. — Orbicular, convex, irregularly striated con- 

 centrically, margin thin. 



Penn. Brit. Zool. iv. 95. t. Iv. f. 51. Mont. Test. Brit. 117 T. Lucina 



rotundata, Turt. Biv. Brit. 115. — Sandy shores, common. 



Diameter upwards of an inch ; yellowish-white, thin, with one or two obso- 

 lete waves from the beak to the margin on the retral side ; a very small de- 

 pression in front of the beaks, which are prominent and inclining ; the third 

 or posterior tooth of the right valve very small. 



532. V. substriata. — Transversely ovate, concentrically wrink- 

 led, with obsolete undulated longitudinal striae. 



Mont. Test. Brit. Sup. 48. t. xxix. f. 6. Turt. Biv. Brit. 151 — Frith of 

 Forth, Mr Laskey. 



Length half an inch, breadth a little more ; white, subpellucid ; beak small, 

 placed near to one side ; hinge with three teeth, the two anterior ones short, 

 the posterior one long and oblique, forming a cavity between it and the mar- 

 gin, for the reception of the cartilage. 



533. V. subrhomboidea. — Subrhomboidal, rounded anteally, 



truncated retrally, and irregularly wrinkled concentrically. 



Mont. Test. Brit. Sup. 49 Crassina sub. Turt. Biv. Brit. 120 — Frith 



of Forth, Mr Laskey. 



