LIMA. 3 



in the neighbourhood of the umbo only. With the exception of this character the 

 English specimens agree closely with the foreign examples, and this difference 

 may very well be due to the latter being much less perfectly preserved than the 

 former. Moreover, in some English specimens the ridges mentioned are partly or 

 entirely wanting. 



The English examples occur at a lower horizon than those found abroad, 

 namely, in the zone of Pecten asper. The foreign specimens are found in the 

 Turonian and Senonian, and possibly also in the Cenomanian, and, like the English 

 examples, they occur chiefly in beds of a sandy nature. This last fact may account 

 for the absence of the species in the English Chalk, during the deposition of which 

 the sea-floor was formed of ooze and was at a greater depth. 



Lima Etalloni, Pictet and Campiche, 1 from the Valanginian, presents some 

 resemblance to L. canalifera, but has a smaller apical angle ; the character of its 

 fine ornamentation is unknown. 



Type. — Goldfuss' specimens came from the Senonian of Quedlinburg, Haltern 

 and Regensburg. 



Distribution. — Upper Greensand (zone of Pecten asper) of Ventnor. 



Ltma Galliennei, (VOrbigvy, 1847. Plate II, figs, la — c. 



1847. Lima Gallienniana, A. d'Orbigny. Pal. Franc. Terr. Cret., vol. iii, p. 548, 



pi. ccccxx, figs. 1 — 3 (Galliennei on 

 plate). 

 1850. — Prodr. de Pal., vol. ii, p. 1GG. 



1854. Galliennei, J. Morris. Cat. Brit. Foss., ed. 2, p. 171. 



1867. E. Gueravger. Album Pale'ont. de la Sarthe, p. 18, 



pi. xxiii, figs. 23, 24. 

 1869. F. J. Pictet and G. Campiche. Foss. Terr. Cret, Ste. 



Croix (Mater. Pal. Suisse, ser. 5), 

 p. 168. 

 1871. Radula Galliennei, F. Stoliczka. Palaeont. Indica, Cret. Fauna S. India, 



vol. iii, p. 414. 



Description. — Shell compressed, more or less oblong with rounded margin ; 

 height greater than length. Antero-dorsal margin straight or slightly concave. 

 Apical angle large. Umbones close together. Anterior area only slightly depressed, 

 with sharp borders. 



Ornamentation consists of 12 to 15 strong, much elevated ribs with rounded 



1 ' Terr. Cret. Ste. Croix' (1869), p. 141, pi. clxiv, fig. 3. 



