PLATE 23 



Figs. 1a, b. Bathrotomaria aitkeni sp. nov. Middle-Upper Kimmeridgian. N. bank 

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

 GG. 10306 : a, apertural view ; b, base, both x 1 . . . . . . p. 138 



