432 CRETACEOUS LAMELLTBRANCHIA. 



Affiititu's. — Only tAvo right valves of this species have been seen. They 

 resemble closely Capan ('/'^//(/hs, d'Orbigny,' l)nt the ribs on the posterior part of the 

 shell are more numerous and less coarse. 



Distrihution. — Upper Greensand (zone of SchJceithachui roHtrafa) of Blackdown 

 and Ilaldon. 



Leptosolkn r KKiTANcrr.Auis (IFuoJ.v), 1897. Plate LX 11, tigs. 1-j— 17. 



[Omitted fmm Vol. TI, p. 221.] 



1897. Trapezium ukctangulake, H. Womh. Qiuirt. Journ. Gt'ol. Soc, vol. liii, 



p. 392, pi. -xxviii, figs. 11. 12. 



Desrrijifiun. — Shell niure or less oblong, very inequilatei'al, moderately convex, 

 with flattened or slightly concave sides. Anterior part not so high as the posterior 

 part. Postero-dorsal margin nearly straight and nearly parallel to the ventral 

 margin ; anterior margin rounded ; posterior margin truncated, slightly convex or 

 nearly straight, and almost at right angles to the postero-dorsal margin. Umbones 

 inconspicuous, with a carina extending in a curve to the postero-ventral angle, and 

 limiting a triangular postero-dorsal area. A strong internal ridge extends from 

 the und)o towards the opposite ventral margin. Length 19 mm., height 11 mm. 



Affinities. — A similar species has been referred doubtfully by "Weller- to 

 LepioHolen. J/odiohi tetniijona, Reuss,^also shows some resemblance to the English 

 species. The hinge is not shown in any of the specimens, and the generic position 

 must be regarded as uncertain. 



Type. — In the Sedgwick Museum, Cambridge. 



Vi.^fribution. — Chalk Rock of Cuckhamsley, Berkshire. 



Vol. II, page 2-30, line 5 from the bottom, for " variiciis^' read " rastvafa." 

 Tiii!Aci.\? (JiiAcius {Soirerhi/), 1S:?(;. Plate LXII, figs. 18, 19. 



[Omitted from Vol IT, p. 244.] 



1830. PsAMMOBiA? GRACILIS, J. (le C. Soicerhij. Tr.aus. Geol. Soc, ser. 2, vol. iv, 



pp. 2-12, 3-11, pi. xvi, tig. 12. 

 1850. Tellina gracilis, A. (VOrhujmj. Prodr. de Pal., vol. ii, p. 159. 

 1854. Psammobia gracilis, J . Morris. Cat. Brit. Fo.ss., ed. 2, p. 222. 



' 'Pal. Fianc. Terr. Cret.,' vol. iii (1845), p. 423, pi. ccclxxxi, figs. 1, 2. 



- • Cret. Palffiont. Now Jersey ' (1907), p. 626, pi. Ixx, fig. 29. 



^ 'Die Vcrstciii. der bOhm. Kreideformat.,' pt. 2 (1846), p. 15, pi. xxxiii, fig. 6. 



