448 
MOLLUSCA. VENERID.E. 
Venus. 
528. V. rugosa . — Subtriangularly heart-shaped, with numer- 
ous concentric sharp ridges. 
Penn. Brit. Zool. iv. t. Ivi. f. 50.— -V. cancellata, Don. Brit. Shells, t. cxv* 
—V. laminosa, Laskey^ Wern. Mem. i. 384. t. viii. f. 16 — 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. GaZZiria.— Subtriangularly heart-shaped, with numer- 
ous glossy, transverse, rounded ridges, with sharp reflected edges. 
Pectunculus fuseus. List. Conch, t. cclxxxii — ^V. Gal. Linn. Syst. i. 1130. 
— V. rugosa, var. Penn. Brit. Zool. iv. 95 — ^Venus striatula, Don. Brit. 
Shells, t. Ixviii. Mmt. 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 fron t 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. suhstriata . — Transversely ovate, concentrically wrink- 
led, with obsolete undulated longitudinal striae. 
Mmt. 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. suhrhomboidea. — 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. 
