TRIBE NYMPHACEA. 61 



Section. — N. Tellinaria. 

 * With one or two lateral teeth. 



TELLINA. 



Transverse or orbicular, generally flattened ; the anterior side 

 angular, a flexuous irregular plait on the margin; with one or 

 two primary teeth in the same valve, and usually two lateral teeth, 

 frequently remote ; ligament external. 



* Transversely oblong. 



T. Radiata. Lin. U\7.—L>.p.83.—Lam. l.—Sow. G.— 

 Ch.f. 100 # 102— J?, t. 289. /. 2.— Reeve, t. 55./. l.—W. t.4. 

 f. 26. Oblong, smooth, polished, with very delicate longitudinal 

 striae and red rays, on a white ground ; hinge nearer the anterior 

 extremity, which is somewhat beaked and inflected. ]J..2f. — 

 Europe § West Indies. — (Unimaculata. Lam. 2. — E. t. 289. f. 

 3.) — Variety, without the rays, but the beaks tinged with rose 

 colour. 



T. Semizonalis. Lam. 3. — Del. t. 6.f. 1. Oblong, narrow, 

 with extremely delicate longitudinal striae, very pale violet, and 

 somewhat zoned : within reddish-purple, with two very oblique in- 

 distinct white rays at the anterior extremity. — Resembles Unima- 

 culata. 



T. Maculosa. Lam. 4. — T. Interrupta. D.p.75. — E. t. 

 288. f. 7. — W. t. 3.f 4. Oblong, sub-equilateral, rough with trans- 

 verseraised striae, with chesnut purplish-red or tawny letter-like linear 

 markings disposed radiatingly on a white ground : anterior end 

 beaked and its slope lamellar, posteriorly rounded : two lateral 

 teeth. \^..2%. — W. Indies. — Broader than the next. 



T. Virgata. Lin. U\6.—D.p. 74.— Lam. 5.—E. t. 288. /. 

 2.- Ch.f. 67 $ 72.— Wood. G. C. t. 35. /. \.—W. t. 3.f. 3. 

 Ovate-oblong, equilateral, somewhat beaked and angulated at the 

 anterior extremity, and rough with transverse striae ; variable in 

 colour, being yellow with paler transverse bands and rosy rays, white 

 with red rays or vice versa. An. var. ? (Ch. f 68. — E. t. 288. 

 f 4. — T. Margin alis. D. j). 74.) Longer in proportion, and 

 the striae less coarse. If ..2-f. — India. 



T. Staubella. Lam. 6. — Ch. f 66. Oval, angulated and 

 shorter anteriorly where the transverse striae become rough and 

 elevated ; yellow within and without, the beaks usually adorned 

 with a purplish-crimson cross, and incipient rays. — Variety, 

 without the rays. — Variety, {Del. t. 6.f. 2.), without the cross 

 and but slightly rayed. I J.. 2. — New Holland. 



T. Crucigera. Lam. 7 '. Ovate-oblong, somewhat beaked and 



