o J I RASSIC BIVALVIA AND (.ASTROPODA 



published two short papers in which he referred to the presence of Jurassic rocks 

 in the hinterland of Dar es Salaam and Bagamoyo, mentioning the occurrence of 

 fossil molluscs in them without citing any specific names. 



Futterer (1894) reviewed occurrences of Jurassic rocks in the hinterland of Mom- 

 basa, Tanga, Saadani and Dar es Salaam in the light of fossils sent to Germany by 

 Hildebrandt, Lieder and von dem Borne. Although mainly devoted to ammonites, 

 thought to belong to stages ranging from Callovian to Kimmeridgian or possibly 

 Tithonian, this paper may be noted particularly as containing the description of the 

 first supposedly new bivalve species from the East African Jurassic. It was a 

 Chlamys described (Futterer 1894 : 91, pi. 5, figs. 4, 4a) as Pecten bipartitus and 

 came from beds at Mkusi 1 , near Tanga, thought to be Oxfordian in age. In the 

 present work it is suggested that the form in question should be regarded as a syno- 

 nym of the European species Chlamys snbtextoria (Munster). 



The most important contribution to the Mesozoic palaeontology of East Africa 

 that had so far appeared was Midler's (1900) description of the fossils collected by 

 W. Bornhardt. This material came from 23 localities in Tanganyika. The beds at 

 nine of these were assigned to various stages of the Jurassic and those at 14 to the 

 Cretaceous, but it has since been suggested that two of the 14 belonged to the upper- 

 most Jurassic and a third to an earlier stage of that system. Most of the Jurassic 

 localities were situated in the hinterland of Kiswere, in the southern part of the 

 territory, but one lay to the north-west of Kilwa and others in the hinterland of 

 Dar es Salaam and Bagamoyo. The Jurassic bivalves and gastropods described by 

 Miiller included a number of forms definitely or tentatively referred to species pre- 

 viously known from Europe, but the following were regarded as new: Cucullaea 

 lasti, Isocardia subtenera, Ceromya acquatorialis , Avicula lieberti, Area uitenhagensis , 

 Trigonia beyschlagi, Protocardia schencki, Exogyra solea, Straparollus suprajurensis, 

 Nerinea credneri. In the present memoir some of these are regarded as synonyms 

 of species which had been described previously, and one or two are recorded from 

 further localities ; five, however, have not been encountered in the material studied. 



A note published by Menzel (1902) dealt with Jurassic fossils collected by Dantz 

 in Tanganyika. These included a number of bivalves, some of which were referred 

 to species already known from Europe ; two, however, to which the new names 

 Pecten muelleri and Gervillia dantzi were assigned, but which are not identifiable from 

 the brief descriptions, were recorded from beds thought to be Bathonian in age at a 

 locality near Kibwendere on the Ngerengere river. Koert (1904) recorded the 

 presence of Callovian beds, identified by their ammonites, near Tanga, but did not 

 list any other mollusca. Fraas (1908a) gave an account of his observations on the 

 dinosaur beds at Tendaguru and neighbouring localities in the Lindi hinterland, 

 mentioning the abundance of a trigoniid which he recorded as Trigonia beyschlagi 

 Miiller, and referring also to a limestone full of nerineids. He considered all the 

 beds to be Cretaceous in age. The same author (19086) also published a short 

 account of observations on Jurassic rocks exposed along the railway lines running 

 inland from Dar es Salaam and from Mombasa respectively. Among the sections 



\itkcn, in Quennell el al., 1956 : 157. 



