112 JURASSIC BIVALVIA AND GASTROPODA 



Anisocardia minima (J. Sowerby) 

 PL 18, fig. 8 



1821a. Isocardia minima J. Sowerby : 171, pi. 295, fig. 1. 



1934a. Anisocardia minima (J. Sowerby) ; Arkell : 275, pi. 36, figs. 8-1 1. 



1947. Anisocardia minima (J. Sowerby) ; Cox : 170, text-figs. 43a, b. 



Material. One specimen (no. L.92120). 



Locality and horizon. Hills S. of Rahmu-Melka Murri road, 13 miles W. of 

 Rahmu, N.E. Kenya ; Callovian, Rukesa Shales. 



Remarks. This specimen, about 21 mm. long, is not distinguishable from English 

 specimens of this well-known species, discussed in my 1947 paper. The range of the 

 species in Europe is from Upper Bajocian to Callovian or possibly Oxfordian. 



Anisocardia kinjeleena sp. nov. 

 PI. 18, fig. 3 



Diagnosis. Shell of medium size for the genus (length of holotype 17-5 mm.), 

 subquadrate, with height little less than length ; inflation rather feeble. Umbo 

 projecting slightly above postero-dorsal outline, and well incurved to strongly pro- 

 sogyrous beak, which lies at about anterior quarter of length of shell. Posterior 

 margin straight, forming a rounded-off angle which is only slightly greater than a 

 right angle with straight postero-dorsal outline and a slightly less well-defined angle 

 with moderately and symmetrically convex ventral margin. Anterior end of shell 

 rather low, with strongly convex margin ; antero-dorsal outline well excavated. 

 Diagonal ridge sharp, presenting an upward-facing convexity along its entire length, 

 and delimiting a strongly concave postero-dorsal area. 



Holotype and paratypes. Holotype, no. L.51938. Three paratypes. 



Localities and horizons. Kinjele, 5 miles W. of Mtapaia, N. of Tendaguru, 

 Tanganyika (type-locality) ; Upper Kimmeridgian, Indogrammatodon Bed. Kin- 

 dope valley, N.N.W. of Tendaguru ; Upper Kimmeridgian, Nerinella Bed. 



Remarks. This species is referred to Anisocardia rather than to Opis as the 

 specimens have no trace of concentric ornament, which is usually visible even on 

 internal moulds of the latter genus. Its subquadrate form and high postero-dorsal 

 angle serve to distinguish it from any species of Anisocardia described previously. 



Genus EO TRA PEZI UM Douville 1913 



Eotrapezium ? africanum sp. nov. 

 PI. 18, figs. 7a, b 



Diagnosis. Of medium size (length of holotype 32-3 mm.), subrectangular, 

 elongate, inequilateral, beaks at anterior quarter of length, inflation moderate. 

 Umbonal outline obtuse, umbones slightly incurved ; postero-dorsal margin almost 



