LIMA. 7 



have uot beeu able to obtain specimens of i. Rauliniuiui, but it seems to tlil'fer from 

 L. mhovalis in having a hirgor posterior ear and in other characters. 



Tijpe>i.—l\\ the Bristol Museum (No. 1778), from the Upper Greensand, proba])]y 

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

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

 Sedgwick Museum, Cambridge. 



Distribution. — Upper Greensand (zone of Sc1dujub<(<:hi(i rudynta) of Haldon. 

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

 bridge Greensand (derived). Rye 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. 8a, b, 9 a, b. 



Description. — Shell compressed, ovate, height greater than lengtli ; autei'u- 

 dorsal margin rather short, straight oi' slightly concave, ventral and posterior 

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

 nearly smooth oi' 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 intei'calated 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 : 



(1) (2) (3) 



Length . 54 . 52 . 38 mm. 



Heiffht .62 . 58 . 42 „ 



'1-1 



(1 — 3) Upper Groonsaiul, Wuruiiiistor. 



Affinities. — This species is near to LiiiM rhotoiiuujensii, d'Orbigny,' from the 

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

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

 relatively narrower and the grooves broader. 



TyjJes. — In the Museum of Practical Geology. 



Distribution. — Upper Greensand (zone of Pecten as2)er) of Warminster. 



1 'Pal. Franv. Terr. Crct.," vol. iii (18-i7), p. 5.57, pi. coccxxii, tigs. 8—11. 



