LIMA. 7 



have not been able to obtain specimens of L. Rauliniana, but it seems to differ from 

 L. siibovalis in having a larger posterior ear and in other characters. 

 . Types. In the Bristol Museum (No. 1778), from the Upper Greensand, probably 

 of Warminster. The type of L. ornata is from the Cenomanian of Le Mans. The 

 specimen from the Cambridge Greensand figured by Jukes-Browne is in the 

 Sedgwick Museum, Cambridge. 



Distribution. Upper Greensand (zone of Schkenbachia rostrata) of Haldon. 

 Upper Greensand (zone of Pecten asper) of North Dorset, and Warminster. Cam- 

 bridge Greensand (derived). Eye Hill Sand of Maiden Bradley. Chloritic Marl 

 of Rocken End (Isle of Wight). Base of Chalk Marl (Greensand bed) of Folkestone. 

 Also recorded by the Geological Survey from the Cenomanian of Devon and Chard. 



LIMA SCABRISSIMA, sp. nov. Plate II, figs. 8 a, b, 9 a, b. 



Description. Shell compressed, ovate, height greater than length; antero- 

 dorsal margin rather short, straight or slightly concave, ventral and posterior 

 margins forming a regular curve. Anterior area much depressed, sharply limited, 

 nearly smooth or with faint ribs- Apical angle about 92. Posterior ear of 

 moderate size, with distinct growth-lines ; anterior ear small. 



Ornamentation consists of a large number of narrow, rounded, more or less 

 undulating ribs separated by broader grooves. The ribs are generally of nearly 

 equal size, but smaller ones may be intercalated in the grooves. At regular 

 intervals the ribs bear scales or lappet-like projections which are arranged con- 

 centrically and may become vertical at their ends ; these scales are continued 

 across the grooves as laminar projections. On the anterior and posterior ribs the 

 " scales " become more pointed. 

 Measurements : 



(i) (2) (3) 



Length 54 . 52 . 38 mm. 



Height 62 . 58 . 42 



(1 3) Upper Greensand, Warminster. 



Affinities. This species is near to Lima rhotomagensis, d'Orbigny, 1 from the 

 Cenomanian of Rouen, but is distinguished from it by being much less convex, by 

 having a smaller anterior area and a smaller apical angle, and by the ribs being 

 relatively narrower and the grooves broader. 



Types. In the Museum of Practical Geology. 



Distribution. Upper Greensand (zone of Pecten asper) of Warminster. 



1 'Pal. Franc. Terr. Cret.,' vol. iii (1847), p. 557, pi. ccccxxii, figs. 811. 



