326 TELLINIDiE. 



This genus is closely allied to the last, though there are 

 sufficient distinctions between both shell and animal — dis- 

 tinctions of more consequence than those which separate 

 Psammohia from Tellina. The only British shell included 

 in it has had the felicity of enjoying at various times not 

 fewer than a dozen generic titles. The few known species 

 live in the mud of estuaries, and are gregarious. 



S. pu'ERATA, Gmelin. 



Plate XV. fig. 5, and (Animal) Plate K. fig. G. 



List. Hist. Conch, pi. 253, f. 88. 

 Mya Ifispaiiica, Chemn. Conch, vol. vi. p. 31, pi. 3, f. 21. 

 Vetitis JJorealis, Penn. (not Linn.) ed. 4, vol. iv. p. 9G, pi. 48, f. 28 (badly). 

 TriffoiicUa plana, Da Costa, Brit. Conch, p. 200, pi. 13, f. ]. — Exp. Scient. 



Algerie, Moll. pi. 44 to 64 (shell, animal, and anatomy). 

 Ml/a Gaditana, Gmelin, Syst. Nat. p. 3221 (made from figure only). 

 Macira Listeri, G.melin, Syst. Nat. p. 3261. — Linn. Trans, vol. viii. p. 71. — ■ 

 Dorset Catal. p. 33, pi. 7, f. 1.— Turt. Conch. Diction, p. 83. 

 — Index Testae, pi. 6, Alactra, f. 25. 

 Madra piperata, Gmelin, Syst. Nat. p. 3261. — Dillw, Recent Shells, vol. i. 



p. 142. 

 Mactru comprcssa, Pultenev, in Ilutchins' Dorset, p. 31. — Mont. Test. 



Brit. p. 96 and 570. 

 Tellina pkma, DoNOV. British Shells, vol. ii. pi. 64, f. 1. 



Lutruria compressa, Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 91. — Cuouch, 



Introd. Conch, pi. 4, f. 3.— Hanl. Recent Shells, p. 27. — 



Chenu, 111. Conch. Lutraria, pi. 1, f. 7. — Bkown, 111. 



Conch. G. B. p. 109, pi. 43, f. 4. 



Lutraria piperata, La.m. Anim. s. Vert, (ed. Desh.) vol. vi. p. 92. — Piiilippi, 



Moll. Sicil. vol. i. p. 9. 

 Listera compressa, Turt. Dithyra Brit. p. 51, pi. 5, f. 1,2. — Brit. Marine Conch. 



p. 45, 

 Lutricola comjrressa, Blainv, Malac. pi. 77, f, 2, 

 Scrobieularia piperata, Philippi, Moll. Sicil. vol. ii. p. 8. 

 Lutraria Listeri, Macuilliv. Moll. Aberd. p. 291. 

 Laviyno calcinellu, Recluz, 111. Couch. Lavigno, p. 8. 

 Amphidesina tratisversum, Say, Amcric, Conch, pi. 2!', mid. figures (iide Rcclu/). 



So peculiarly wide a variation of outline seems permitted 

 to this species, that until very lately, the elliptic si)ecimens 

 of tlie Mediterranean have been specifically separated from 



