274 MOLLUSCA FROM THE CRAG. 



vary in form or magnitude like those so conspicuously shown in some of the 

 Tellenii. 



The species arc not very numerous, even ^vhen admitting those which constantly 

 inhabit fresh water. They are found sometimes in mud. but more frequently on sandy 

 bottoms, and have a considerable vertical range. Fossil species have been found as 

 earh' as the Lower Oolite. 



1 CoRBULA STRIATA, Waller and Boi/s. Tab. XXX, fig. 3, a — d. 



Cardil'M striatum apicibus kefi.exis. Walk, and Boys. Test. Min. Rar., p. 24, t. 3, 



fig. 85, 1787. 

 Tellina gibba. Olivi. Zool. Adriat., p. 101, 1792. 



— — Broc. Conch. Foss. Subap., p. ,017, No. I.t, 181-1. 

 JIya iK.^QrivALvis. Mont. Test. Brit., p. 38, t. 26, fig. 7, 1803. 

 CoRBULA GIBBA. Nyst. Coq. Foss. de Belg., p. G.5, pi. 3, fig. 3, 1844. 



— — ioi'<«n. Ind. Moll. Scapd., p. 49, 1846. 



— NUCLEUS. Lamk. Hist, des An. s. Vert., v, p. 496, 1818. 



— — Forbes. Report on Jilgean Invert., p. 180, 1843. 



— — Phil. En. JIoll. Sic., vol. ii, p. 12, 1844. 



— — Bronn. Leth. Geogn., p. 967, t. 37, fig. 7, a — c. 1838. 



— STRIATA. Flem. Brit. An., p. 425i, 1828. 



— — Desk. E.xped. Sclent, .\lger., p. 231. 



— KOTUXDATA. J. Soio. Min. Conrli., t. 572, fig. 4, 182". 



_ _ Gold/. Petr. Germ., vol. ii, p. 252, pi. 152, fig. 3, a—e, 1842. 



— Olimplica. Costa. Cat. Syst. e. reg. Test delle 2 Sicil., p. 27, 1829. 



— in.i;quivai.vis. Maeyill. Moll. Aberd., p. 303, 1843. 



— ELEGANS. Nyst. Rech. Coq. Foss. Prov. d'Anv., p. 3, 1835. 



— BicosTATA. Id. Rech. Coq. Foss. Prov. d'Anv., No. 10, pi. 1, fig. 10. 



— PLANULATA. Id. Coq. Foss. de Bclg., p. 68, pi. 2, fig. 4, 1844. 

 Not CoKBULA STRIATA. Lamk. 



Spec. Char. Testa sublrianf/nlari, ffibbosd, subincequilaterali, valde incequivalvi, valvd 

 dcvtrd tumidiori, concentrice striata; valvd sinistra complanatd, sublavigatd ; anticc 

 rolimdatd, postice iruncatd. 



Shell subtriangular, gibbous, slightly inaiquilateral, greatly inequivalve, right valve 

 the more inflated, and roughly striated ; left valve nearly flat and smooth ; anterior 

 side rounded, posterior truncated. 



Diameter, ^ inch. 



Locality. Coralline Crag, Sutton, Gcdgrave, Ramsholt. 

 Red Crag, Sutton, Bawdscy, Walton Naze. 



Recent, Scandinavia, Britain, and Mediterranean. 



In the Coralline Crag at Sutton this is one of the most common shells, and 

 although furnished with an apparatus for the firm interlocking of the valves, the two 



