260 MOLLUSC A FROM THE CRAG. 



Spec. Char. Testa ovaio-ohlongd, transversa, convexiusculd, tenui, subeBquilaterali, 

 antice rotundatd, postice truncatd, et atiffulatd ; punctis minutissimis asperatd ; callo 

 ligamcntifero magno. 



Shell ovatcly oblong, transverse, slightl}' convex, thin, subequilatcral, anterior side 

 rounded, posterior truncated and angulated, exterior minutely granulated ; hinge with 

 large projecting callus, divided by a ridge. 



Le)i(/th, 2\ inches. Hcit/hf, 2^ inches. 



Locality. Cor. Crag, Sutton and Gedgrave. 



Clyde Beds. Smith. Recent, Britain and /Egean. 



A thin and fragile shell, not very rare, but difficult to obtain. Like most of the 

 specimens of this genus found in the Crag, they are somewhat distorted from com- 

 pression, and one or other of the valves in consequence cracked, thereby altering a 

 little the natural appearance of the shell. On closely comi)aring it with the existing 

 species, it may be remarked that the left valve is rather less contracted, — that is, the 

 ventral margin is more convex, or not so straight, as in the living shell, and the umbo 

 apparently less prominent ; but the few specimens that I have seen are all pushed a 

 little out of their natural position, and these trifling differences would probably 

 disappear in a larger and better series. 



2. Thracia phaseolina, Lamarck. Tab. XXVL fig- 2, a — c. 



Mya DECLivis. Tvrt. Conch. Diet., p. 9S, ISIC. 

 Anatina dkclivis. /(/. Brit. Biv., p. 1", 1822. 



— ruDEScKNs. Id. Brit. Biv., p. 45, t. \, fig. .'5 (young). 

 Ami'HIDESma phaseolina. Lamk. Hist. Nat., torn, v, p. -192, No. 1 1, 1818. 

 TniiACiA PHASEOLINA. Keiner. Coq. viv. Thracia, pi. 2, fig. 4. 



— — Pliil. En. Moll. Sic, vol. i, p. 19, t. 1, fig. 7, 1837. 

 Odoncineta papykacea. J)a Costa. Test. Sicil., p. 23, pi. 2, figs. 1 — 1, 1829. 

 Thracia phaseolina. Forb. and Hani. Hist, of Brit. AIoU., p. 221, pi. 1", figs. 5, 6 ; 



and pi. n (animal), fig. -4, 1848. 



— — CoutJi. Bost. Journ. Nat. Hist., p. 147, 1839. 



— — Lov/:-n. Ind. Moll. Scand., p. 46, No. 321, 1846. 

 Tellina papyracea. Poll. Test. Sicil., t. 15, fig. 18. 



Spec. Char. Testd elongato-ovatd, transversd, sulcequilaterali, tumidiusculd, tenui; 

 antice rotundatd, postice truncatd; margine vent rati convexiusculo. 



Shell elongato-ovate, transverse, nearly equilateral, thin, and fragile ; anterior side 

 rounded, posterior truncated ; ventral margin slightly rounded. 



Length, 1 inch. Height, § inch. 



Locality. Cor. Crag, Sutton. 



Recent, Britain, Mediterranean, Scandina^'^a. 



Small specimens are by no means rare at Sutton ; and as the recent conchologists 



profess to have sufficient evidence for the separation of this from the young of 7' 



