FROM TANGANYIKA AND KENYA 17 



from these formations. Species represented in the collections examined by the pre- 

 sent writer may be listed as follows (R, Rukesa Shales ; ME, Muddo Erri Lime- 

 stones) : 



Brachidontes (Arcomytilus) asper (J. Sowerby). ME 



Brachidontes (Arcomytilus) laitmairensis (de Loriol). ME 



Eligmus rollandi Douville. ME 



Entolium corneolum (Young & Bird). ME 



Eopecten aubryi (Douville). R, ME 



Camptonectes auritus (Schlotheim). ME 



Chlamys curvivarians (Dietrich). R, ME 



Lima (Plagiosioma) cf. schardti de Loriol. R, ME 



Lima (Plagiostoma) cf. jumaraensis Cox. ME 



Lima (Plagiostoma) muddoensis sp. nov. ME 



Pseudolimea duplicata (J. de C. Sowerby). ME 



Lopha costata (J. de C. Sowerby). R, ME 



Lopha gregarea (J. Sowerby). R, ME 



Liostrea (Catinida) alimena (d'Orbigny). R, ME 



Lucina cf. lirata Phillips. ME 



Mactromya aequalis Agassiz. R, ME 



Cer atomy opsis basochiana (Defrance). R, ME 



Anisocardia minima (J. Sowerby). R 



Pholadomya lirata (J. Sowerby). R 



Pholadomya ovalis (J. Sowerby). ME 



Homomya inornata (J. de C. Sowerby). R 



Cer atomy a concentrica (J. de C. Sowerby). R, ME 



Cer atomy a wimmisensis (Gillieron). ME 



If these lists of Callovian species are examined it would appear that the East African 

 assemblages during that stage differed less from those living contemporaneously in 

 Europe than during the Bajocian and Toarcian. The number of species, whether 

 new or previously described, unknown from Europe is relatively small. Previously 

 described species in these lists known only from East Africa are Grammatodon 

 (Indogrammatodon) stockleyi, Trigonia (Frenguelliella) tealei and Astarte muelleri. 

 Species common to India and East Africa but unknown from Europe are Grammato- 

 don (Indogrammatodon) virgatus, Lycettia indica, Modiolus glendayi, Eopecten aubryi, 

 Chlamys curvivarians, Chlamys (Spondylopectenl) badiensis, Trigonia prora, and 

 Astarte unilateralis (omitting those forms of which the identifications are qualified). 

 The incoming of the subgenus Indogrammatodon, abundant in this region as well as 

 in Arabia and N.W. India but unknown in Europe, may be particularly noted at this 

 stage. 



Oxfordian Assemblages 



Aitken (1961 : 21) has listed a series of ammonites which establish the Upper 

 Oxfordian age of part of the succession in the area of southern Tanganyika dealt 

 with in his paper, but the only identified bivalve species collected by him at one of 



