History of British animals - University of Guam Marine Laboratory

448 MOLLUSCA. VENERID^. Venus528. V, rugosa.— Subtriangularly heart-shaped, with numerousconcentric sharp ridges.Penn. Brit. Zool. iv. t. lvi. f. 50.—V. cancellata, Don. Brit. Shells, t. cxv-—V. laminosa, 38— Laskey, Wern. Mem. i. 384. t. viii. f. 10—Mont. Test.Brit. Sup. Turt. Biv. Brit. 148. t. x. f. 4.-^.Various parts of thecoast.Length about an inch, breadth an inch and a quarter ; colour white, tingedwith brown the ; margin of the ridges thin, slightly waved, and faintly striatedon the distal side.— 529- V. Galllna. — Subtriangularly heart-shaped, with numerousglossy, 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, andnumerous zig-zag streaks ; the ridges are sloping externally, with the proximaledge low and sharp. It differs from the preceding, besides the form ofthe ridges, in being more tumid, the cartilage slope not so straight, and thedepression in front of the beaks not so much produced.530. V. pallida.— Triangularly heart-shaped;slightly producedretrally, with obscure transverse parallelribs crossed byfine close longitudinal lines.Turt. Biv. Brit. 150. t. x. f. 5 Found at Dowlish.Length about an inch, breadth nearly two ; thin, semitransparent ; yellowish-white;beaks prominent, pointed, the slopes on each extremity smooth ;margin thin.** Margin plain,531. V. undata.— Orbicular, convex, irregularlystriated concentrically,margin thin.Penn. Brit. Zool. iv. 95. t. Iv. 115.— f. 51. Mont. Test. Brit. 117 T. Lucinarotundata, Turt. Biv. Brit. Sandy shores, common.Diameter upwards of an inch ; yellowish-white, thin, with one or two obsoletewaves from the beak to the margin on the retral side a ; very small depressionin front of the beaks, which are prominent and inclining ; the thirdor posterior tooth of the right valve very small.532. V. substriata.— Transversely ovate, concentrically wrinkled,with obsolete undulated longitudinal striae.Mont. Test. Brit. Sup. 48. t. xxix. f. 6. Turt. Biv. Brit. 151—Frith ofForth, 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 margin,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—Frithof Forth, Mr Laskey.