PLATE 22 



Figs. la, b, c, d. Discohelix didimtnensis sp. nov. Upper Lias, Toarcian. Didimtu 

 hill, 2 miles S. of Bur Mayo, N.E. Kenya. Holotype, GG. 10246 : a, x 1 ; b, upper face, 

 x 4 ; c, lower face, X 4 ; d, outer face, x 4 . . . . . . .p. 137 



Figs. 2a, b, c. Numtnocalcar mitoleensis sp. nov. Upper Kimmeridgian. Mpilepile 

 stream, E. of Mitole, Tanganyika. Holotype, GG. 10282 : a, upper face ; b, lower face ; 

 c, outer face, all x 1 5 . . . . . . . . . . .p. 138 



Figs. 3a, b. Psendorhytidopihis lonjiensis sp. nov. Callovian. Lonji— Runjo stream, 

 i£ miles W. of Mandawa, Tanganyika. Holotype, GG.10312 : a, side view ; b, apical 

 view, both x 1 ............ p. 139 



Figs. 4a, b. Scurriopsis (Dietrichiella) kindopensis (Dietrich). Upper Kimmeridgian, 

 " Trigonia smeei " Bed. Kindope, N.N.W. of Tendaguru, Tanganyika. G. 48913 : 

 a, x 1 ; b, x 3 . . . . . . . . . . .p. 141 



Figs. 5a, b. Symmetrocapulus ? sp. Upper Kimmeridgian, " Trigonia smeei " Bed. 

 Tingutitinguti creek, Tendaguru, Tanganyika. G. 48031 : a, x 1 ; b, x 3 . . p. 140 



Fig. 6. Bathrotomaria aitkeni sp. nov. Middle-Upper Kimmeridgian. N. Bank of 

 Mandawa-Namakongoro stream, about 1 mile W. of Mandawa, Tanganyika. Holotype, 

 GG. 10306 : abapertural view, x 1 ........ p. 138 



