284 TELLINIDiE. 



is six-rayed or fimbriated, the anal eight-rayed. The foot 

 is rather large, and has no byssal groove. The labial palpi 

 are of considerable size. 



D. FRAGiLis, Linnseus. 



Plate XXr. fig. 3, and Plate K. f. 2 (animal). 



Tellina frayilis, Linn. Syst. Nat. ed. P2, p. 1117. — Turt. Conch. Diction, p. 16G. 

 — Chemn. Conch. Cab. vol. vi. p. 95, pi. 9, f. 84.— Poli, Test. 

 Sicil. vol. i. pi. 15, f. 22, 24. — Dillw. Recent Shells, vol. i. p. 

 78.— Index Testaceolog. pi. 3, Tellina, f. 7. — Philippi, Moll. 

 Sicil. vol. i. p. 27, and vol. ii. p. 22. — Philippi, in Wiegm. 

 Archiv. f. Natur. 1845, p. 190, pi. 7, f. 19, 20 (animal).— 

 Hanl. in Sow. Thesaur. Conch, vol. i, p. 319, pi. 56, f. 14, and 

 pi. 60, f. 149. 

 Petricola ochroleuca, Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 157. — Sowerby, 

 Genera Shells, Petricola, f. 4. — Payraud. Cat. Moll. Corse, 

 pi. 1, f. 9, 10.— Deshayes, Elem. Conch, pi. 12, f. 13, 

 14, 15. — Reeve, Conch. Systemat. pi. 51, f. 4. — Hanl. 

 Recent Shells, p. 52, suppl. pi. 1, Tellina, f. 6, 

 PsammotcBa Tarentina, Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 183. — De- 

 LESSERT, Rec. Coquilles, pi. 5, f. 11. — Hanl. Recent 

 Shells, p. 60. 

 Tellina jtiffosa. Brown, Werner. Memoirs, vol. ii. p. 506, pi. 24, f. 2. 

 Psammohia/ragUis, Turt. Dithyra Brit. p. 88, pi. 7, f. 11, 12. — Flem. Brit. 



Anim. p. 438. — Brit. Marine Conch, p. 62. 

 Tellina ochroleuca, Wood, Index Test, suppl. pi. 1, Tellina, f. 6. 

 Psammobia jiigosa, Brown, Illust. Conch. G. B. p. 102, pi. 40, f. 4, 5, 6. 

 Diodonta fragilis, Desh. Exped. Sci. Alg6rie, Moll. pi. 68 (animal, &c.). 



The range of variation permitted to the Diodonta fragilis 

 is very remarkable, extending, as it does, not merely to 

 shape and colour, but likewise to sculpture. In the Medi- 

 terranean examples, the shell is comparatively smooth and 

 fragile ; those from Africa are occasionally beautifully la- 

 mellated ; whilst in the British and northern specimens the 

 valves, which are coarser and stronger, have the lamellse 

 very irregularly developed. 



