History of British animals - University of Guam Marine Laboratory

Donax. MOLLUSCA. DONACID.E. 433Mactra alba, Wood, Linn. Trans, vi. 174. t. xvi. f. 9-12. Ligula Boysii,Mont. Test. Brit. 98. t. iii. f. 7— Amphidesina Boysii, Turt. Biv.Brit. 53. t. v. f. 4, Sandy shores, frequent.Length half' an inch, breadth three-quarters, glossy, pellucid ; slopes fromthe beak on both sides ; the ventral margin rather suddenly rounded; a singlevalve, and a large lateral tooth on each side inone valve ; it is readily distinguished by its shortness and pellucidity.471. A. tenue.— Subtriangular, equilateral with a roundedventral margin.Ligula tennis, Mont. Test. Brit 572. t. xvii. f. 7-— A. tenue, Turt. Biv.Brit. 53.— South coast of England.Length a quarter of an inch, breadth a little more ; white, concentricallywrinkled, compressed, beaks produced, central ; hinge with one bifurcatedtooth, and a remote lateral one in one valve, and a single plain tooth in theother.Gen. CXIX.DONACIDiE.DONAX.— Transversely subtriangular,retrallyshort and truncated ; hinge with two teeth in bothvalves ; lateral teeth rather remote.* Inner margin crenulated.-472. D. trunculus. — Shell with numerous minute simplelongitudinal striae, becoming obsolete towards the anteal extremity.Tellina intus ex viola purpurascens, in ambitu serrata, List. An. Ang190; Conch, t. ccclxxvi. f. 217—D. trull. Linn. Syst. i. 1127. Penn.Brit. Zool. iv. 93. t. Iv. Mont. Test. Brit. 103. Turt. Biv. Brit. 123.—Sandy shores, common.Length five-eighths of an inch, breadth one inch and a quarter ; a yellowish-whitecuticle, inside purple, retrally obliquely truncated, the anal anglerounded; anteally compressed, rounded, with the dorsal margin nearlystraight.473. D. denticulata.— Shell with numerous tine puncturedlongitudinal striae.oTellina purpurascens, List. Conch, t. ccclxxvi. f. 218.— D. dent. Linn.Syst. i. 1127. Penn. Brit. Zool. iv. 93. Mont. Test. Brit. 104. Turt.Biv. Brit. 124 English shores, rare.Length about half an inch, breadth an inch ; whitish, rayed with purple.It is more suddenly truncated retrally than the preceding species, and roughwith ridges.** Inner margin entire.474. D. complanata,— Transversely elongated, smooth, witha longitudinal white band.vol. 1.e e