PLATE 20 



Fig. 1. Pholadomya ovalis (J. Sowerby). Callovian [?-Lower Oxfordian], Muddo Erri 

 Limestones. Kulong, 2 miles S.W. of Muddo Erri, N.E. Kenya. L. 92075, x 1 . p. 126 



Fig. 2. Pholadomya reticulata Agassiz. Upper Lias, Toarcian. Didimtu hill, 2 miles 

 S. of Bur Mayo, N.E. Kenya. LL. 35076, x 2 . . . . . . .p. 125 



Figs. 3a, b. Homomya rakmuensis sp. nov. Oxfordian, Rahmu Shales. Uacha, 6 miles 

 S. of Rahmu, N.E. Kenya. Holotype, L. 92260 : a, right valve ; b, dorsal view, both 

 xi p. 128 



Fig. 4. Homomya hortulana Agassiz. Upper Kimmeridgian, Nerinella Bed. N. of 

 Kipande, Tendaguru, Tanganyika. L. 51 177, x 1 . . . . . .p. 128 



Fig. 5. Pholadomya hemicardia Roemer. Upper Oxfordian. Mandawa-Lonji creek 

 traverse, Mandawa area, Tanganyika. LL. 35156, x 1 . . . . .p. 127 



Fig. 6. Pleuromya uniformis (J. Sowerby). Upper Kimmeridgian. Kinjele, 5 miles 

 W. of Mtapaia, Tanganyika. L. 51934, x 1 ....... p. 131 



Fig. 7. Ceratomya concentrica (J. de C. Sowerby). Callovian [?-Lower Oxfordian], 

 Muddo Erri Limestones. Kulong, 2 miles S.W. of Muddo Erri, N.E. Kenya. L.92084, 

 X 1 .............. p. 132 



Fig. 8. Pholadomya livata (J. Sowerby). Callovian. 2 miles E. of Magindu Station, 

 Tanganyika. L.54120, x 1 . . . . . . . . . .p. 126 



Fig. 9. Pleuromya calceiformis (Phillips). Upper Oxfordian. Mandawa-Lonji creek 

 traverse, Mandawa area, Tanganyika. LL. 35158, x 1 ..... p. 132 



Fig. 10. Ceratomya excentrica (Roemer). Kimmeridgian, Hereri Shales. Hereri river 

 crossing 3, miles S. of Melka Kunha, N.E. Kenya : L. 92200, x 1 . . . p. 135 



