34 CRETACEOUS LAMELLIBRANCHIA. 



Measurements : 











(i) 



(2) 



(3) 



Lengtli 



35 



30 



30 mm, 



Height 



31 



28 



26 „ 



Thickness 



18 



17 



16 „ 



(1, 2) Rye Hill Sands, Warminster. 



(3) Upper Greensand, Longbridge, Devizes. 



Affinities. — This species is closely allied to Lima parallela, but is distinguished 

 by being less convex (especially in the region of the umbones), by being rather 

 shorter and higher, and by the ribs decreasing in size rather more rapidly when 

 traced from the antero -ventral region to the posterior region. The fine radial orna- 

 mentation is also perhaps rather better marked than in L. parallela. 



L. intermedia differs from L. elongata (see below) in being less convex, relatively 

 shorter, in the ribs being less elevated and decreasing in size posteriorly, and in the 

 absence or indistinct character of the ribs on the anterior area. 



It is also relatively shorter and higher than Lima gaultina, and the ribs on the 

 posterior half are much smaller and have broader and flatter interspaces. The 

 intermediate rib is distinct in L. intermedia, but is absent or indistinct in L. gaultina. 



Type. — From the Cenomanian of Le Mans. 



Distribution. — Upper Greensand (zone of Pecten asper) of Longbridge, near 

 Devizes. Rye Hill Sands of Warminster. 



Lima (Mantellum) elongata (Sowerby), 1827. Plate VI, figs. 5, 6a— c, 7a, b. 



1822. Plagiostoma, G. Mantell. Foss. S. Downs, p. 129, pi. xix, fig. 1. 

 1827. elongata, J. de C. Sowerby. Min. Conch., vol. vi, p. 113, 



pi. dlix, fig. 2 (lower figure). 

 ? 1847. Lima Astieriana, A. d'Orbigny. Pal. Franc. Terr. Cret., vol. iii, p. 549, 



pi. ccccxx, figs. 4 — 7. 

 1850. Plagiostoma parallelus, J. de G. Sowerby in F. Dixon. Geol. Sussex, 



p. 35G (p. 386, ed. 2), pi. xxviii, fig. 16. 

 1854. Lima elongata, /. Morris. Cat. Brit. Foss., ed. 2, p. 171 (partim). 



1869. F. J. Pictet and G. Ccmpiche. Foss. Terr. Cret. Ste. Croix 



(Mater. Pal. Suisse, ser. 5), p. 168. 



1870. F. Bonier. Geol. von Oberschles., p. 343, pi. xxix, fig. 1. 

 ? 1876. H. Deiclce. Tourtia von Miilheini a. d. Eulir, p. 27. 



? 1877. G. Bbhm. Zeitschr. d. deutsch. geol. Gesellsch., vol. xxix 



p. 234. 

 1897. — B. Leonhard. Kreideformat. in Oberschles. (Palseonto- 



graphica, vol. xliv), p. 47. 

 1904. E. T. Newton and A. J. Jukes-Broivne. Cret. Rocks of 



Britain, vol. iii, p. 451. 



