PLATE 26 



Figs, la, b. Exelissa dodsoni sp. nov. Bathonian-Callovian, Bur Mayo Limestones. 

 Hagardulun, 25 miles N.E. of Tarbaj, N.E. Kenya, a, group of specimens, G. 79190, 

 showing holotype and numerous paratypes, X 1 ; b, part of same group, with holotype 

 near middle of left side of figure, x 4 . . . . . . . . p. 158 



Fig. 2. Purpuroidea aff. gigas (Thurmann & Etallon). Upper Kimmeridgian. £ mile 

 N.W. of Mbinga, Tanganyika. GG. 10328, X o-8 ...... p. 155 



Figs. 3a, b, c. Coelostylina stockleyi sp. nov. Bajocian. i\ miles N.N.W. of Kidugallo, 

 Tanganyika. Holotype, GG.10281 : a, x 1 ; b, apertural view, x 3 ; c, abapertural 

 view, x 3 ............. p. 152 



Figs. 4a, b, c. Pseudomelania (Oonia) kidugalloensis sp. nov. Bajocian. z\ miles N.N.W. 

 of Kidugallo, Tanganyika. Holotype, GG. 10280 ; a, x 1 ; b, apertural view, x 3 ; 

 c, abapertural view, X 3 . . . . . . . . . . .p. 149 



