BIVALVIA. 223 



Tellina depressa. Penn. Brit. Zool., ed. 4, vol. iv, p. 87, pi. 47, fig. 27. 

 Psammobia vespertina. Lam. An. s. Vert., t. 5, p. 511, 1818. 



— Phil. En. Moll. Sic, vol. i, p. 22 ; vol. ii, p. 21. 



— — Lovtn. Ind. Moll. Scand., p. 42, 1846. 



— — Sism. Syn. An. Inv. Pedm, Foss., p. 21, 1847. 

 Psammocola vespertina. Blainv. Malac, p. 77, fig. 4, 1825. 

 Sanguinolaria — Flem. Brit. Anim., p. 460, 1828. 



Chama lutescens. List. Hist. Conch., t. 417, fig. 261. 



Azor variabilis. " Leach." Ann. Mag. Nat. Hist., vol. xx, p. 272. 



Spec. Char. Testa oblongo-ovatd, subinaquilaterali, concentrice striata, striis obtusis 

 depressis; antice rotundald, posticc subtruncatd ; margine subtilissime crenidato. 



Shell ovately oblong, slightly inequilateral, concentrically striated, strise obtuse, 

 depressed ; anterior side rounded, posterior somewhat truncated ; margin very finely 

 crenulated. 



Length, 2 inches. Height, 1 inch. 



Locality. Cor. Crag, Ramsholt and Sudbourn. 



Recent, Mediterranean, British, and Norwegian Seas. 



A very few specimens only of this elegant species have fallen under my observa- 

 tion. I have no hesitation in assigning the smaller shell (fig. 2, c, d), found at Rams- 

 holt, as an identity with the recent British species. Fig. 2, a, b, is the representation 

 of a specimen found by myself at Sudbourne, and the only difference appears to be in 

 its having somewhat larger proportions, this one measuring as much as 2f inches 

 in length, and 1^ inch high; and our fossil is in all probability only a monstrous form 

 of the existing shell. It strongly resembles Psam. Stangcri, Gray, ' Faun, of New 

 Zealand,' p. 273, No. 179. 



3. Psammobia tellinella, Lamarck. Tab. XXII, fig. 4, a, b. 



Psammobia tellinella. Lamk. Hist. des. An. s. Vert., v, p. 515, 1818. 



— Forb. and Hani. Hist, of Brit. Moll., vol. i, p. 277, pi. 19, fig. 4, 



and Animal, pi. k, fig. 1, 1848. 

 Lovcn. Ind. Moll. Scand., p. 42, No. 303, 1846. 

 Alder. Cat. Moll. North, and Durh., p. 89, 1848. 



— Florida. Turt. Brit. Biv., p. 86, pi. 6, fig. 9, 1822. 



Spec. Char. Testa transversa, ovato-oblongd, tenui ; transversim striata ; antice ocato- 

 rotundatd ; postice subangulatd ; margine ventrali leviter ar citato ; cardine bidentato, altera 

 unidentato, sinu palliari prof undo. 



Shell transverse, ovately oblong, thin, very finely striated transversely ; anterior 

 side slightly rounded, posterior somewhat angulated ; ventral margin slightly curved ; 

 hinge with one tooth in one valve, inserted between two in the other ; palleal sinus 

 deep. 



