FROM TANGANYIKA AND KENYA 63 



height ; posterior margin short, ventral margin strongly asymmetrical, feebly con- 

 vex posteriorly, strongly convex anteriorly. Inflation weak. Umbonal region 

 sharply rounded in outline, its angle less than a right angle. Anterior umbonal 

 ridge rounded off, fading away before reaching somewhat upturned antero-ventral 

 part of shell. Lunule short, well excavated. Posterior auricle small and obtuse, 

 anterior auricle virtually absent. Ornament consisting of 43 broad, depressed ribs 

 which are interrupted by irregularly and rather distantly spaced growth-rugae and 

 in the holotype are deflected in an anterior direction at the stage when the shell was 

 about three-quarters fully grown. Intervals between ribs narrow and shallow, 

 apparently not punctate. 



Holotype. No. L. 56240. The only specimen. 



Locality and horizon. Kindope, N.N.W. of Tendaguru, Tanganyika ; Upper 

 Kimmeridgian, Nerinella Bed. 



Remarks. Although much of the holotype is an internal mould, the original 

 shell is preserved in places, particularly in the antero-ventral region. This species 

 is comparable to L. monsbeliardensis Contejean (de Loriol 1872 : 377, pi. 22, figs. 2, 

 2a), from the Lower Kimmeridgian of Europe, but has fewer ribs and also differs in its 

 somewhat lunate outline. In L. virgulina Contejean (i860 : 308, pi. 23, figs. 1, 2), 

 another rather similar species from the Kimmeridgian of Europe, the ribs are even 

 more numerous. In L. meroe de Loriol (1894a : 151, pi. 10, figs. 17, 18), Lower 

 Kimmeridgian of France, there are about 60 ribs and a distinct anterior auricle is 

 present. 



Lima (Acesta) cutleri sp. nov. 



PI. 8, fig. 9 



Specific name. After the late W. E. Cutler, the first leader of the British Mu- 

 seum East Africa Expedition. 



Diagnosis. Relatively small, narrowly subovate, broadening ventrally, and 

 with a slight lunate tendency ; height much exceeding length ; inflation moderate. 

 Posterior and ventral margins forming an uninterrupted curve, the lower part of 

 which is strongly and asymmetrically convex ; anterior margin very slightly con- 

 cave. Umbonal region narrow, no distinct umbonal ridges ; no lunule. Posterior 

 auricle obtuse, not distinctly delimited from body of shell ; anterior auricle virtually 

 absent. Ornament consisting of slightly sinuous, punctate, linear grooves, the 

 intervals between which are flat and do not form distinct ribs except on anterior part 

 of surface, where they are slightly elevated. Grooves close together on posterior 

 part of surface but more widely spaced on anterior part ; their total number exceeds 

 60. There are also a few well-marked and very irregularly distributed growth- 

 rugae. 



Holotype and paratypes. Holotype, no L. 52033. There are several paratypes. 



Localities and horizon. Tingutitinguti creek (type-locality) ; Nitongola 

 creek, and Kindope valley, all near Tendaguru, Tanganyika ; Upper Kimmerid- 

 gian, " Trigonia smeei " Bed. 



