•^02 Mr. Pv. B. Newton on Fossil Molhr^ca (G;c. 



It is possible that this fragment may belong to Roudairaia 

 rfr?a' oF Muniei-Chalmas*, tlie type of that genus and the 

 equivalent of Coquand's anressensis, a well-known shell 

 ranging from Senonian to Danian times, as found in various 

 African localities^ e-pecially in Tunis and Egypt. So Ear as 

 can be seen, the specimen appears to differ from VenieVa 

 forhesiana of Stoliczka f, an allied species of Lower Senonian 

 age from India, Zululand, &c., in being narrower and more 

 delicately constructed in the umbonal region and in possessing 

 tlie horizontal character of the ridges ; the specimen also 

 would appear to have been more compressed, especially near 

 the carination. 



The other related species from India are Cyprina cristata 

 and cordiniis of Stoliczka, described and figured in the same 

 work. 



It is of interest to note that Dr. Solger \ has determi;ied 

 some bivalves from the " Mongokreide " of the Cameroons 

 as belonging to this genus, with resemblances to Roudaireia 

 a>i7'essensfs, Coquand, sp., but without illu-frations, which 

 would indicate that the Ui)per Cretaceous rocks of that area 

 are continued into Southern Nigeria. 



For the present, however, it is considered best to refer 

 Mr. Parkinson's fragment to the species auressensis with a 

 query, until further material is forthcoming for fuller con- 

 firmation as to its true specific relations. In the meantime 

 the specimen is of great ,2;eological interest, as its presence 

 indicates the existence of Upper Cretaceous deposits belonging 

 somewhere between the Upper Senonian and the Danian 

 stages of that period. In this late portion of the Cretaceous 

 the species has been recorded from x\Igeria, Tunis, Tripoli, 

 Egypt [Of^trea overwegiheh of the Libyan Desert), Palestine, 

 and Syria §, and a related form from the (Jameroous 

 ( = Kanierun). 



(C) An Orhitoidal Limestone fro III Southern Ni<jeria. 



Mr. Parkinson's geological specimens from Southern 

 Nigeria include a piece of limestone of yellow-ochreous 

 colour madeup entirely of what appears to be one form of 



* 'Mission M. le Com. liOiidaire Cliotts Tiuiisiens,' 1881, pis. iv. & v, 

 pp, 74-77. 



t See R. B. Newton, Trans. Royal Soc. South Africa, 1909, vol. i. 

 p. 67. 



I " Die Foss. Mongolireide Kamerun," in Ur. Enist Esch's ' Reitiiige 

 zur Geologie von Kamerun,' 1904, p. 280. 



§ Blanckeuhorn, ' Beitrage zur Geologie Syriens,' 1890, pp. 24, 25, 27. 



