222 MOLLUSCA FROM THE CRAG. 



TELLINA FERVENSIS. Gmel. Syst. Nat., p. 3235, 1788. 



W. Wood. Linn. Trans., vol. vi, p. 174, t. 15, figs. 20, 21, 1802. 



RADIATA. Da Costa. Brit. Conch., p. 209, t. 14, fig. 1, 1778. 



INCARNATA. Penn. Brit. Zool., vol. iv, p. 74, pi. 47, fig. 31, 1776. 



MURICATA. Broc. Conch. Suhap., p. 511, t. 12, fig. 2. 



TRUNCATA. Spengler. Fide Lov6n. 



TRIFASCIATA. Don. Brit. Shells, vol. ii, pi. 60, 1800. 

 PSAMMOBIA FERROENSIS. Lamk. Hist. Nat. des An. s. Vert., v, p. 512. 



Phil. En. Moll. Sic., vol. i, p. 23, pi. 3, fig. 7, 1836. 



Lov6n. Ind. Moll. Scand., p. 42, 1846. 



Sismonda. Syn. An. Invert. Pedm. Foss., p. 21, 1847. 

 DDMONTII. Nyst. Coq. Foss. de Belg., p. 103, pi. 4, fig. 12, 1844. 

 L.EVIS. Id. Coq. Foss. de Belg., p. 104, pi. 4, fig. 13. 



MTJRICATA. Id. Coq. Foss. de Belg., p. 105. 

 ? Grateloup.- Cat. Zool. des An. Vert, et Invert., p. 67, 1838. 



AFFINIS? Dugard. Mem. de la Soc. Geol. de France, torn, ii, part 2, 



p. 257, pi. 18, fig. 4, 1837. 



Spec. Char. Testa transvervd, ovato-oUongd, subtequilaterali, tenui ; concentrice 

 striatd ; antice rotundatd ; postice truncatd, angulatd, striatd et decussatd ; margine 

 ventrali conveuoiuscido ; sinu palliari magno. 



Shell transverse, ovately oblong, nearly equilateral, thin ; concentrically striated ; 

 anterior side rounded ; posterior truncated, and decussated upon the posterior slope ; 

 ventral margin slightly curved ; palleal sinus large. 



Length, 1-| inch. Height, -|ths of an inch. 



Locality. Cor. Crag, Gedgrave, Button, and Ramsholt. 



Recent, Britain, Mediterranean, Finraark. 



This elegant shell, in its full-grown state, is rare ; but small specimens and frag- 

 ments are by no means scarce. I have assigned it, without a doubt, to the existing 

 species, although some of my fossils appear rather more transverse, or have a some- 

 what greater length comparatively than the recent shell. My Crag specimens are 

 particularly thin and fragile, with scarcely a trace of any muscular impression. In 

 some of the young specimens the radiating striae upon the angular slope of the pos- 

 terior side are strongly marked with decussating lines. 



This is said to have been found fossil in the Drift beds of Lancashire and Ireland. 



2. PSAMMOBIA VESPERTINA, Chemnitz. Tab. XXII, fig. 2, a d. 



Lux VESPERTINA. Chemn. Conch. Cah., vol. vi, p. 72, t. 7, figs. 59, 60, 1782. 



SOLEN VESPERTINUS. Gmel. Syst. Nat., p. 3228, 1788. 



TELLINA VARIABILIS. Don. Brit. Shells, vol. ii, t. 41, fig. 2, 1800. 



GARI. Poll. Test. Sicil., pi. 15, figs. 19, 21, 23, vol. i, p. 41, 1791. 



Born. Test. Mus. Cses. Viad., p. 31, t. 2, figs. 6, 7, 1780. 

 ALBIDA. Dillw. Desc. Cat. Brit. Shells, vol. 1, p. 78, 1817. 



