92 JURASSIC BIVALVIA AND GASTROPODA 



Astarte weissermeli Dietrich 

 PI. 13, figs. 2, 3 

 1933. Astarte weissermeli Dietrich : 41, pi. 6, figs. 75-80. 



Material. Several specimens. 



Localities and horizons. Nitongola creek, Maimbwi river, Kindope valley, 

 and £ mile S. of Nautope, all Tendaguru district, Tanganyika ; Upper Kimmeridgian, 

 " Trigonia smeei " Bed. Mpilepile stream, 800 yards E.N.E. of junction of main 

 road and Mahokondo road, Mitole, northern Mandawa area, Tanganyika ; Upper 

 Kimmeridgian. 



Remarks. This is a fairly strongly and evenly inflated, suborbicular species with 

 a rather prominent umbo situated at about the anterior third of the length of the 

 shell and with ornament of strong, irregular concentric corrugations. The largest 

 specimen in the material studied is about 30 mm. high. 



Astarte mitoleensis sp. nov. 

 PL 13, fig. 1 



Diagnosis. Large (length of holotype 74 mm.), ovate, height four-fifths of length, 

 strongly inequilateral ; inflation moderate. Umbo not quite terminal, incurved, 

 convexly subangular in outline ; postero-dorsal outline strongly convex, rising at first 

 well above umbo and then curving down to form a rounded-off, obtuse angle with 

 the rather low, almost straight, vertical posterior margin. Antero-dorsal outline 

 strongly excavated ; ventral and antero-ventral margins of moderately strong 

 convexity. Lunule well excavated ; no escutcheon. Median part of flank flattened 

 ventrally. Ornament consisting of very irregular concentric undulations and rugae, 

 not more evenly arranged in early than in later growth-stages. 



Holotype. No. LL. 35123, ex B.P. Coll. The only specimen. 



Locality and horizon. Mpilepile stream, 1300 yards E.N.E. of Mitole road 

 junction, northern Mandawa area, Tanganyika ; Upper Kimmeridgian. 



Remarks. This species differs from Astarte stuhlmanni (Miiller), Neocomian, 

 Tanganyika, and from A. subobovata Dietrich, Upper Kimmeridgian, Tanganyika, 

 in its less inflated form, its more strongly excavated antero-dorsal outline, and its flat 

 posterior margin. Compared with A. episcopalis de Loriol, it is higher at its poste- 

 rior end and less elongate. It very closely resembles the European Aptian species 

 Astarte obovata J. Sowerby. 



Subgenus LECKHAMPTONIA Cox & Arkell 1948 



Astarte (Leckhamptonia) hobleyi sp. nov. 

 PI. 15, figs. 2«, b 



Specific name. After the late C. W. Hobley, a pioneer in the investigation of 

 the geology of Kenya. 



