TRIBE NYMPHACEA. 83 



€./. 14. Trapeziform, transverse, turgid, sub-equilateral, longitu- 

 dinally grooved, white reticulated with reddish brown spots, posterior 

 end nearly smooth, anterior slope gibbous in the middle : pale 

 orange rufous within, the margin serrated. 1. — New Holland. — 

 Scarcely a Donax, the hinge more resembling that of Cardium 

 Medium, and the palleal scar not sloped posteriorly . 



D. Meroe. Lam. 22.— Venus. M. Lin. 1132.— D. p. 185. 

 —W. t. S.f. 62.— Ch. f. 450, 1, 2.—E. t. 261. /. I.— List. t. 

 3/8. f. 221. Ovate, triangular, compressed, with narrow transverse 

 parallel grooves, variable in colouring, but generally whitish, tinged 

 more or less with fulvous, and covered with a broad zig-zag stripe of 

 a purplish or liver colour : anterior slope excavated. — Variety. — 

 Uniform white or purple. {Ch. f. 453). 2. — India. 



D. Scripta.* Lin. 1127.— D. p. 154.— Lam. 23.— List. L 

 379. f. 222.— E. t. 261./. 2, 3, A.—Ch.f. 261,2, 3.— W. L 6.f. 

 15. Ovate, somewhat flattened, smooth, white with waved lines and 

 spots (which are usually parallel) of a purplish orange reddish or 

 fawn colour ; anterior depression hollowed and the ligament sunk in 

 a groove : margins acute. — India. 4, 



D. Anatinum.* Lam. — Blain. t. 72. /. 2. — D. Trunculus. 

 W. t. 6. f. 5. (not Lam. 24.)— Don. t. 29. /. l.—D. p. 150.— 

 Lis. t. 376./. 217.— Dors. Cat. t. 6. /. 3. —Da Costa, t. 14 f. 

 3. Oblong wedge-shaped, with the hinge margin nearly straight ; 

 glossy, with numerous minute longitudinal simple striae, becoming 

 obsolete towards the anterior end, which is shorter, smooth, and 

 very obliquely truncated ; yellowish olive, with two or three pale 

 rays, and darker or lighter bands ; violet within : a single lateral 

 tooth, ■§• . . 1^. — Europe. 5 



D. Fabagella. Lam. 25. Transversely oblong, with the an- 

 terior side short oblique convex and sub-carinated ; whitish some- 

 what tinged with red, and indistinctly rayed : the transverse striae 

 decussated by extremely fine longitudinal ones. I. 6 



4 Both this and the preceding species are more allied to Cytherea 

 than Donax. There are three cardinal teeth in the right and two 

 in the left valve, the posterior tooth confounding itself with the 

 nymphae. These cardinal teeth are disposed differently from those 

 of Donax proper. 



5 We have given a copy of the D. Striatus of Chemnitz ( W. t. 6. 

 y. 7.) which is probably an exaggerated figure of this species ; cer- 

 tainly it is not the Striatus of Linne. 



6 This is probably the same as D. Semistriata. Poll. t. 19../. 

 7. — Philip, p. 36. t. 3. f. 12. Oblong, wedge-shaped, usually 

 drab with two white rays, very smooth posteriorly, anteriorly with 

 decussating striae : anterior slope with strong transverse grooves, its 



G 2 



