208 CRETACEOUS LAMELLIBRANCHIA. 



Remarks. — The examples of Toucasia Lonsdalei are in the condition of internal 

 casts in a ferruginous sandstone, so that it is difficult to compare this with other 

 species. The casts show a considerable amount of variation in form. D'Orbigny, 

 de Loriol, and Pictet and Campiche included Requienia carinata, Matheron, 1 from 

 the Urgonian of Orgon, as a synonym of Sowerby's Diceras Lonsdalei; but Prof. 

 Douville * and M. Paquier 3 think that the identity of the two forms is doubtful 

 and can only be determined by a careful comparison of English specimens with 

 internal casts of T. carinata. Prof. Douville' 1 ' suggests that there is a resemblance 

 between T. Seunesi and T. Lonsdalei. 



Type. — The type, which is stated to have come from near Calne, cannot now 

 be found. The specimen from which Woodward's outline figure was drawn is in 

 the British Museum, No. 88825. 



Distribution. — Lower Greensand of Stock Orchard, south of Calne. Recorded 

 by Morris from Lockswell Heath, south-west of Calne. 



Family— MONOPLETJRIDtE, Fischer. 



Genus — Gyropleura, H. Douville, 1887. 

 (' Bull. Soc. geol. de France,' ser. 3, vol. xv, p. 768.) 



Gyropleura cornucopia; (d'Orbigny), 1847. Plate XXXIII, fig. 7 a, b. 



1847. Chama cornucopia, A. d'Orbigny. Pal. Franc. Terr. Cret., vol. iii, p. 689, 



pi. cccclxiv, figs. 3—7. 

 1850. — d'Orbigny. Prodr. de Pal., vol. ii, p. 170. 



1868. F. J. Pictet and G. Campiche. Terr. Cret. de Ste. Croix 



(Mater. Pal. Suisse, ser. 5), p. 7. 

 1871. F. Stoliczha. Palseont. Indica, Cret. Fauna S. India, 



vol. iii, p. 234. 

 1887. Gyropleura — H. Douville. Bull. Soc. ge'ol. de France, ser. 3, vol. 



xv, p. 771, fig. 3. 



Remarks. — Two specimens from the Chloritic Marl of Dorset agree in form 

 with examples of G. cornucopim from the Cenomanian of Rouen (the locality 



1 ' Catal. Foss. des Bouches-du-Blume ' (1842), p. 104, pi. ii, figs. 1,2; Caprotina Lonsdalii, 

 d'Orbigny, 'Ann. Sci. Nat. Zoo!.,' ser. 2, vol. xvii (1842), p. 180; Requienia Lonsdalii, d'Orbigny, 

 'Pal. Franc. Terr. Cret.,' vol. iv (1850), p. 248, pis. dlxxvi, dlxxvii ; Caprotina Lonsdalii, de Loriol, in 

 Favre, ' Rech. geol. dans Savoie,' vol. i (1867), p. 386, pi. C, fig. 22; Requienia Lonsdalii, Pictet and 

 Campiche, 'Terr. Cret. Ste. Croix' ('Mater. Pal. Suisse,' ser. 5, 1868), p. 14, pi. clxi. 



2 'Bull. Soc. geol. de France,' ser. 3, vol. xvii (1889), p. 630. 



3 'Les Eudistes Urgoniens,' I ('Mem. Soc. ge'ol. de France,' Paleont. XI, 1903), p. 41. 

 1 Op. cif., p. 632. 



