FROM TANGANYIKA AND KENYA 15 



Sphaeriola madridi (d'Archiac) 

 Corbula asaharbitensis sp. nov. 

 Cuspidaria ayersi sp. nov. 



Unfortunately, the Asaharbito Beds have yielded no ammonites and on the basis 

 of the assemblage listed above it is not possible to say anything more definite than 

 that they are of Bathonian or Callovian age. The Grammatodon and Sphaeriola, 

 both species found in Europe, suggest a Bathonian age, but Trigonia brevicostata 

 occurs in India in the Callovian. Liostrea dubiensis is a widely distributed species 

 with an extended geological range. So far, the two species most characteristic of 

 the Bathonian rocks of Madagascar and N.W. India, Protocardia grandidieri (Newton) 

 and Corbula lyrata J. de C. Sowerby, have not been reported from East Africa. 

 Most of the previously described species identified in the Bathonian of this area have 

 also been found in Europe. Chlamys curvivarians (Dietrich), however, a form with 

 an extended geological range, is known only from E. and N.E. Africa, Arabia and 

 India. 



Callovian Assemblages 



Callovian rocks are well developed in Tanganyika and Kenya, but in this case 

 also it is not yet possible to determine exactly their upper and lower limits in the 

 field. Aitken (1961 : 19-27) has compiled a list of the Mollusca recorded by earlier 

 workers and collected by himself in beds in S.E. Tanganyika belonging to the "Upper 

 Bathonian-Oxfordian " part of his Mandawa-Mahokondo Series and has indicated 

 which of these are probably from the Callovian. The following list of Bivalvia and 

 Gastropoda from the Callovian of this area is based on material examined by the 

 present writer and on Aitken's records, marked with an asterisk in the case of species 

 not represented in this material (the " Ceromyopsis sp." of Aitken is here identified 

 as Cer atomy opsis basochiana (Def ranee)) : 



Grammatodon (Indogrammatodon) virgatus (J. de C. Sowerby) 

 *Lycettia indica Cox 

 *Modiolus glendayi Weir 

 Eopecten anbryi (Douville) 

 Entolium corneolum (Young & Bird) 

 Chlamys (Spondylopectenl) badiensis Cox 

 *Trigonia prora Kitchin 

 Trigonia elongata J. de C. Sowerby 

 *Trigonia aff. propinqua Kitchin 

 *Myophorella (Orthotrigonia) cf. katchensis (Kitchin) 

 * Astarte muelleri Dacque 

 Astarte unilateralis J. de C. Sowerby 

 Astarte aitkeni sp. nov. 

 *Ceratomya concentrica (J. de C. Sowerby) 

 *Ceratomya cf. wimmisensis (Gillieron) 

 *Ceratomyopsis basochiana (Defrance) 

 *Tellnrimya tellnris (Lamarck) 



