LIMA. 



15 



Mensnrcmrrifs 



Length 

 Height 



(5) 



23 mill. 

 23 „ 



(1) (2) (3) (4) 



32 . 31 . 29 . 29 . 



33 . 32 . 29 . 26 

 (1, 2) Upper Grecnsand, Potterne. 



(3, 5) „ „ Ventnor. 



(4) „ „ Blackdown. 



Affi.nitics. — This species is distinguished by its compressed valves and rouiulcd 

 outline. 



Tijpe. — From the Cenomaniau of Le Mans. 



Distribution. — Upper Greensand (zone of Schlmnhachia rostniln) of Potterne 

 (Devizes) and Blackdown. LTpper Greensand (zone of Feet en asper) of Ventnor. 

 Chalk ]\Iarl of Folkestone. 



Lima (Plagiostoma) Meteri, sp. nov. Plate IV, figs. 2,3. Text-fig. 4. 



1896. Lima simplex, A. J. Jukes-Browne. Quart. Joum. Geol. Soc, vol. lii, p. 162. 



Description. — Shell ovate or subtrigonal, much compressed, a little higher than 

 long, oblique, considerably inequilateral ; antero-dorsal margin long and 



Fio. 4. — Lima (Plagiostoma) Meyeri, sp. nov. Upper Greensand, Warminster. Museum of Practical Gcologj-, 

 No. 8838. Left valve and antero-dorsal view. Natural size. 



straightened, ventral and postero-ventral margins rounded. Umbones small, close 

 together. Ajiical angle from 90° to 100°. Anterior area depressed, long and 

 narrow, with a few radial 7-il)s and vertical grooves. Posterior ear small ; anterior 

 ear not seen. 



Ornamentation consists of narrow, linear, .-^hallow, pitted grooves wliieli may 



