260 MOLLUSCA FROM THE CRAG. 



Spec. Char. Testa ovato-oUongd, transversd, convexiusculd, tenui, subcequilaterali, 

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

 ligamentifero magno. 



Shell ovately oblong, transverse, slightly convex, thin, subequllateral, anterior side 

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

 large projecting callus, divided by a ridge. 



Length, 2J inches. Height, 2^ inches. 



Locality. Cor. Crag, Sutton and Gedgrave. 



Clyde Beds. Smith. Recent, Britain and ^gean. 



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 comparing 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. XXVI, fig. 2, a c. 



MYA DECLIVIS. Turt. Conch. Diet., p. 98, 1816. 

 ANATINA DECLIVIS. Id. Brit. Biv., p. 47, 1822. 



PUBESCENS. Id. Brit. Biv., p. 45, t. 4, fig. 3 (young). 



AMPHIDESMA PHASEOLINA. Lamk. Hist. Nat., torn, v, p. 492, No. 11, 1818. 

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



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



ODONCINETA PAPYRACEA. Da Costa. Test. Sicil., p. 23, pi. 2, figs. 1 4, 1829. 

 THRACIA PHASEOLINA. Forb. and Hani. Hist, of Brit. Moll., p. 221, pi. 17, figs. 5, 6 ; 



and pi. H (animal), fig. 4, 1848. 



Couth. Bost. Journ. Nat. Hist., p. 147, 1839. 



Loven. Ind. Moll. Scand., p. 46, No. 321, 1846. 

 TELLINA PAPYKACEA. Poli. Test. Sicil., t. 15, fig. 18. 



Spec. Char. Testa elongato-ovatd, transversd, subcequilaterali, tumidiusculd, tenui; 

 antice rotundatd, postice truncatd ; margine ventrali convexiusculo. 



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

 rounded, posterior truncated ; ventral margin slightly rounded. 



Length, 1 inch. Height, -f inch. 



Locality. Cor. Crag, Sutton. 



Recent, Britain, Mediterranean, Scandinavia. 



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 T. 



