TOUCASIA. 207 



modifitMl l)y pressure. On tlie otlici- hand flic slicll in C. proboKciilniui, from 

 Blackdown, is replaced by siliea, so that both its oniaiiiciifation and ori^-innl shape 

 are perfectly preserved. 



French examples were idontitied by tl'Orbigny ' with this species, for which he 

 proposed the name Canliam Moufonianvm since the specific name (tuberculafn) 

 under which Sowerby originally described the species had already been used. 

 Sowerby, however, in the index at the end of vol. vi of the 'Mineral Conchology,' 

 had already substituted Gentianum for the name which he originally used. I have 

 not seen an}' specimen of C. Motitoninnmn, and am unable to say whether or not it 

 is really identical with G. Gcntlnnnm, but in d'Orbigny's figures the difference in 

 the sizes of the ribs and tubercles is seen on the anterior and posterior parts of 

 the shell only. 



G. GaroUnvm, d'Orbigny,^ and G.incequicostatnm, Matheron,^ are closely related 

 to, and perhaps identical with, G. pnihoscidpnm. 



T;/i>cs. — G. j)rohoscidet(,m, from the Upper Greensand of Blackdown, and 

 Garditii tnhcrcuJata (Gardium Gentianum), from the Upper Greensand of Devizes, 

 are in the British Museum. 



DiMrihntlon. — Upper Greensand (zone of Schlnmhachia rosfrata) of Blackdown, 

 Haldon, Devizes, and Ventnor. 



Famihj—BlCE'RkTl'DJE, Thill. 

 Genus — ToDCASiA, E. Munior-Ghulmnft, 1873. 



(' Jonm. (le Concliyl.,' ser. 3, vol. xxi, p. 74. Douville, ' Bull. Soc. gc'ol. de France,' ser. .3, vol. xv, 



1887, p. 762.) 



ToucASiA LoNSDALEi {Sowevhy), 183G. Plate XXXIII, figs. [■ — G. 



1836. DiCKRAS LoNSDALii, .7. (le C. Soiverhy. Trans. Geol. Soc, ser. 2, vol. iv, 



pp. 268, 338, pi. xiii, fii?. 4. 

 1850. Capeotina Lonsdalii, A. d'Orhitjinj. ProJr. de Pal., vol. ii, p. 109 



(parti III). 



1854. Diceeas Lonsdalii, J. Morris. Cat. Brit. Foss., ed. 2, p. 201. 



1855. Requienia Lonsdalei, S. P. Woodward. Quart. Jouru. Geol. Soc., 



vol. xi, p. 53, fig. 29. 

 1871. — Lonsdai.ii, F. Stoliczt:a. Palseont. ludica, Cret. Fauna 



S. India, vol. iii, p. 233. 



» ' Pal. Fran9. Terr. Cret.,' vol. iii (1844), p. 34, pi. ccxlviii ; and ' Prodr. de Pal.,' vol. ii (1850), 

 p. 162. 



- Op. cit. (1844), p. 29, pi. fcxlv. 



* ' Catal. Foss. des Boucli.'s-du-Rlione ' (1842), y. 157, pi. xviii, figs. 3, 4. 



