Vol. 70.] REMAINS FROM THE VICTORIA MTAlfZA REGION. 193- 



Distribution. — This is a characteristic mollusc of localities in 

 North-Eastern Africa and was originally described from Lake 

 Mareotis. Dr. Jickeli refers to a number of places where the shell 

 has been found, mostly in the Nile waters. According to E. von 

 Martens, the species is not known to exist in the Victoria Nyanza 

 or in the other lakes of that part of Eastern Equatorial Africa ; it 

 has, however, been recorded from Lake Rudolf by Xeuville & 

 Anthony. 1 



Occurrence. — The specimens were found in a brownish marl- 

 stone, associated with Ampullaria and Lanistes, in Bed 32 ; and 

 in Bed 31 associated with Ampullaria and Limi color io. 



L o c a 1 i t y. — Nira . 



Cleopatra exarata (E. von Martens). (PI. XXX, figs. S & 9.) 



Paludomus exarata §" cingulata E. von Martens, Monatsber. K. Preuss. Akad. 



Wissenscb. 1878, p. 297 & pi. ii, figs. 14-16 { — cingulata of the plate). 

 Cleopatra exarata Bourgnignat, 'Moll. Afrique Equator.' 1889, p. 164; E. von 



Martens, 'Bescbalte Weichthiere Ost-Afrikas — Deutscb-Ost-Afrika' (K„ 



Mobius) vol. iv (1898) p. 189. 

 Cleopatra (Zanguebaria) exarata W. Kobelt, Abhandl. Senckenberg. Naturf.. 



Gesellsch. vol. xxxii (1909) p. 80. 



Original diagnosis: — Testa conieo-oblonga, perforata, solida, civgnlis spiralibus 

 elevatis confertis, circa 9 in anfr. penultimo conspicuis, ultra 20 in ultimo, non- 

 nullis bifidis, sculpta, nigricans decollata ; anfr. superstites 4, vix convexiusculi y 

 sutura, mediocri discreti ; apertura subperpendicularis, oblongo-auriformis, 

 superne acutangula, margine externo angulatim arcuato, basali auriculatim 

 producto et effuso, columellari subdilatato, expanso,fulvicante. 



Remarks. — There are several fragmentary examples of this 

 species, in which the characteristic and spirally-banded costae are 

 well preserved. The most complete specimen has escaped anything- 

 like erosion of the spire, so frequently the case among recent forms. 

 This has a length of 15 and a diameter of 8 millimetres ; it is 

 fumished with seven or eight whorls, the protoconch being rounded 

 smooth, and depressed, the two succeeding whorls being more or less- 

 smooth, erect, and carinated in the centre ; the later whorls are of 

 more plano-convex structure, with the exception of the last, which 

 is elongately inflated. The peristome is incomplete, on account of 

 the outer lip being fractured ; the base is, however, well preserved, 

 and shows the produced character of the lip of the columella, 

 together with indications of a narrow perforation. It should be 

 mentioned also that the einordate costae are crossed bv innumer- 

 able, fine, microscopical striations, which give rise to a delicately- 

 decussated surface. 



Distribution. — The species appears to be restricted to the 

 Zanzibar and Mombasa regions of Eastern Africa, the type-locality 

 being Finboni. It does not occur in the Victoria Nyanza, although 

 mentioned incidentally by Bourguignat in his ' Especes Xouv. 

 Oukerewe & Tanganika ' 1885, p. 7. 



Occurrence. — Examples are found in Bed 1G in a greyish 

 sandstone matrix, accompanied by opercula of Ampullaria, Hyra- 

 coid, Chelonian, and Crocodilian remains ; again in Bed 19 in 

 a greyish sandstone, associated with coprolites, Chelonian and 



1 Bull. Soc. Philom. Paris, ser. 9, vol. viii (1906) p. 275. 



