n. JURASSIC BIVALVIA AND GASTROPODA 



Thracia viceliacensis d'Orbigny 

 Pseudorhytidopilus lonjiensis sp. now 

 Pseudomelania aspasia (d'Orbigny) 

 Bourguetia saemanni (Oppel) 

 Harpagodes aff. oceani (Brongniart) 

 Ampullospira quennclli sp. nov. 

 Akera tanganyicensis sp. nov. 



According to Hennig's (1924 : 56) profile, Callovian beds are exposed along the 

 Central Railway in Tanganyika in the cuttings from about 2 km. to nearly 4 km. 

 east of Magindu Station, but he ignored the fact that Kinkelin's Callovian fossils, 

 described by Dacque (1910), came from very close to Magindu Station (see p. 7). 

 As summarized by Aitken {in Quennell et al., 1956 : 180), Hennig (1924 : 57-92) 

 recorded a number of molluscan species from these beds, but some of the determina- 

 tions need revision. The following Callovian species from this part of the railway 

 are recorded in the present memoir : 



Liostrea (Catinida) alimena (d'Orbigny) 



Trigonia (Frenguelliella) tealei Cox 



A start e mnelleri Dacque 



Ceratomyopsis basochiana (Defrance) 



Ceratomya pittieri (de Loriol) 



Pholadomya lirata (J. Sowerby) 



To these may be added the following species, obtained from rocks of about the 

 same age in the district south of Tarawanda, north of Magindu : 

 Grammatodon (1 ndogrammatodon) stockleyi Cox 

 Meleagrinella echinata (Smith) 

 Chlamys subtextoria (Miinster) 

 Protocardia consobrina (Terquem & Jourdy) 

 Neritoma (Neridomns) aff. gea (d'Orbigny) 



At localities near Tanga, in the extreme N.E. of Tanganyika, Callovian beds 

 yielded the following species : 



Grammatodon (I ndogrammatodon) virgatus (J. de C. Sowerby) 



Modiolus bipartitus J. Sowerby 



Oxytoma inequivalvis (J. Sowerby) 



Chlamys (Spondylopecten?) badiensis Cox 



Trigonia [Frenguelliella) tealei Cox 



Goniomya trapezicostata (Pusch) 



In N.E. Kenya, at localities near the Daua river, the Rukesa Shales of Joubert 

 (i960 : 13) are dated as Callovian on the evidence of a nautiloid cephalopod referred 

 to Paracenoceras and of the bivalve assemblage. The presence of Eligmus rollandi 

 Douville suggests that the succeeding Muddo Erri Limestones are at least in part not 

 later than Callovian, although brachiopod evidence has been considered to indicate 

 that these beds extend upwards into the Lower Oxfordian. Joubert (i960 : 14-15, 

 17 18) has compiled lists of molluscs and other invertebrates which have been cited 



