PLATE 27 



Figs. la, b. Cryptaulax bussagensis (Cossmann). Bathonian (?). 2 miles W. of 

 Tengeni, Tanganyika. GG. 10464 : a, x 1 ; b, x 3 . . . . . . p. 160 



Figs. 2a, b. Exelissa africana sp. nov. Bajocian (?). Depth 58-60 feet, Mandawa well 

 no. 6, Tanganyika. Paratype, GG. 10296 : a, x 1 ; b, x 4 . . . . p. 157 



Figs. 3a, b. Same species. Bajocian (?). Depth 52-54 feet, Mandawa well no. 6, 

 Tanganyika. Paratype, GG. 10294 '■ a, x 1 ; b, x 4 . . . . . p. 157 



Figs. 4a, b. Same species. Bajocian (?). Depth 58-60 feet, Mandawa well no. 6, 

 Tanganyika. Paratype, GG. 10297 '■ a, x 1 ; b, x 4 . . . . . p. 157 



Figs. 5a, b. Same species. Bajocian (?). Depth 58-60 feet, Mandawa well no. 6, 

 Tanganyika. Holotype, GG. 10295 '■ a, x 1 ; b, x 4 . . . . . p. 157 



Figs. 6a, b. Paracerithium lonjiense sp. nov. Lower Kimmeridgian. Mandawa-Lonji 

 creek traverse, Tanganyika. Paratype, GG. 10299 '■ a, x 1 ; b, x 8 . . . p. 159 



Figs, ja, b. Pietteia stockleyi sp. nov. Bajocian (?). Depth 58-60 feet, Mandawa well 

 no. 6, Tanganyika. Paratype, GG. 10300 : a, x 1 ; b, x 4 . . . . p. 160 



Figs. 8a, b. Same species. Bajocian (?). Depth 60-62 feet, Mandawa well no. 6, 

 Tanganyika. Paratype, GG.10301 : a, x 1 ; b, x 4 . . . . . p. 160 



Figs, ga, b. Procerithium {Rhabdocolpus) mandawaense sp. nov. Bajocian (?). Depth 

 62-64 feet, Mandawa well no. 6, Tanganyika. Paratype, GG.10291 : a, x 1 ; b, x 4 p. 156 



Figs. 10a, b. Same species. Bajocian (?). Depth 46-48 feet, Mandawa well no. 6, 

 Tanganyika. Paratype, GG. 10292 : a, x 1 ; b, x 4 . . . . . p. 156 



Figs. 11a, b. Same species. Bajocian (?). Depth 48-50 feet, Mandawa well no. 6, 

 Tanganyika. Paratype, GG. 10293 '. a, X 1 ; b, x 4 . . . . . p. 156 



Figs. 12a, b. Same species. Bajocian (?). Depth 46-48 feet, Mandawa well no. 6, 

 Tanganyika. Holotype, GG. 10290 : a, x 1 ; b, x 4 . . . . . p. 156 



Figs. 13a, b. Paracerithium lonjiense sp. nov. Lower Kimmeridgian. Mandawa-Lonji 

 creek traverse, Tanganyika. Holotype, GG. 10298 : a, x 1 ; b, x 8 . . . p. 159 



Figs. 14a, b, c. Pietteia stockleyi sp. nov. Bajocian (?). Near site of Mandawa well 

 no. 1, Tanganyika. Holotype, GG. 10359 : a, x 1 ; b, apertural view, x 4 ; c, abaper- 

 tural view, X 4 ............ p. 160 



Fig. 15. Purpuroidea aff. gigas (Thurmann & Etallon). Upper Kimmeridgian. f mile 

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



Figs. 16a, b, c. Pietteia dusseensis sp. nov. Upper Oxfordian, Seir Limestones. Dusse, 

 i£ miles S.E. of Rahmu, N.E. Kenya. Holotype, G. 76405 : a, x 1 ; b, apertural view, 

 X 3 ; c, abapertural view, x 3 ......... p. 162 



