Donax. 
MOLLUSCA. DONACID^. 
433 
Mactra alba, fVood^ Linn. Trans, vi. 174. t. xvi. f. 9-12. Ligula Boy- 
sii, Mont. Test. Brit. 98. t. iii. f. 7 Ainphidesma Boysii, Turt. Biv. 
Brit. 53. t. V. f. 4, 5 — Sandy shores, frequent. 
Length half an inch, breadth three-quarters, glossy, pellucid slopes from 
the beak on both sides ; the ventral margin rather suddenly rounded ; a sin- 
gle umbonal denticle in each valve, and a large lateral tooth on each side in 
one valve ; it is readily distinguished by its shortness and pellucidity. 
471. A. fenue. — Subtriangular, equilateral with a rounded 
ventral margin. 
Ligula tennis, MonL Test. Brit. 572. t xviL f. 7* — A. tenue, Turt. Biv. 
Brit. 53.— South coast of England. 
Length a quarter of an inch, breadth a little more ; white, concentrically 
wrinkled, compressed, beaks produced, central ; hinge with one bifurcated 
tooth, and a remote lateral one in one valve, and a single plain tooth in the 
other. 
DONACID^ZE. 
Gen. CXIX. DONAX. — Transversely subtriangular, retraU 
ly short and truncated ; hinge with two teeth in both 
valves ; lateral teeth rather remote. 
* Inner margin crenulcited. 
472. D. trunculus. — Shell with numerous minute simple 
longitudinal striae, becoming obsolete towards the anteal extre- 
mity. 
Tellina intus ex viola purpurascens, in ambitu serrata. List. An. Ang 
190. Conch, t. ceclxxvi. f. 217*— ■!)• trun. 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 yellow- 
ish-white cuticle;, inside purple, retrally obliquely truncated, the anal angle 
rounded; anteally compressed, rounded, with the dorsal margin nearly 
straight. 
473. D. denticulata. — Shell with numerous fine punctured 
longitudinal striae. 
TeHina purpurascens. List. Conch, t. ceclxxvi. f. 218. — D. dent. lAnn. 
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 rough 
with ridges. 
Inner margin entire. 
474. D. complanata. — Transversely elongated, smooth, with 
a longitudinal white band, 
VOL. I. 
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