1867.] TATE SOTrTH-APEICAN" FOSSILS. 165 



The generic grouping is such as obtains in the Jurassic strata ; and 

 though no genus present in the Uitenhage series is exclusively of 

 that age, yet the following point to such an age : — Belemnites (of the 

 section Canaliculati), Actceonina, Neritopsis, Alaria, Fleuromya, Pla- 

 Gunopsis, Oervillia, and Isasfrcea. 



The genus Alaria is eminently, but not exclusively, characteristic 

 of Jurassic rocks ; eight speciesj however, have been recorded from 

 beds of Cretaceous age. I have no knowledge of the genus Placu- 

 no]psis having ever been identified from rocks newer than the Lower 

 Oolites, though its occurrence in the Coal-measures of Illinois has 

 lately been recorded by Messrs. Meek and Worthen : and though 

 Isastrcea ranges from the St. Cassian beds to the Tertiary, yet it is a 

 good Jurassic genus. 



On the other hand, Hamites and Crassatella, which are repre- 

 sented in the Uitenhage beds, may be thought to indicate Creta- 

 ceous affinities ; yet I attach very little value to their presence as 

 indicative of Cretaceous age, unless they be supported by more re- 

 stricted genera. Such a one apparently is Crassatella, which hitherto 

 has not been met with below the Lower Greensand ; and its re- 

 stricted range favours the supposition that the Secondary fauna of 

 Uitenhage, or a part of it, is of Cretaceous age ; but that too much 

 value should not be placed on an isolated case receives confirmation 

 in the newly ascertained occurrence of a Crassatella (C. oolitica) in 

 the Inferior Oolite of England : the presence of the genus as marking 

 a Cretaceous facies is materially lessened by this discovery. 



The Uitenhage fauna under notice does not contain a single genus 

 unknown in the Jurassic Series. Krauss, it is true, created the 

 genus Anojplomya on South-African shells ; but it is clearly syno- 

 nymous with Pleuromya. 



jSTone of the fossils enumerated by the late D. Sharpe are identical 

 with any known European species ; but amongst those subsequently 

 added to our collection are two European forms, Trigonia Cassioj^e, 

 D'Orb., and T. Goldfussi, Agassiz. Serjnda Jilaria and S.plicatilis 

 are the other European species. 



A very large number of the Jurassic Mollusca of South Africa have 

 their representatives in the Oolites of Europe and the equivalent 

 beds in India. The following Table exhibits those from Uitenhage 

 which are analogous to Secondary species in other parts of the 

 world. 



