214 R. Bullen Newton — Miocene Shells from Egypt. 



MEEETRIX, alUed to HAGENOWI, Bunker, sp. 



Cytherea Hagenowi, Bunker: Novitates Conchologicse, 1865, pt. ii, No. 2, p. 13, 

 pi. iv, figs. 13-15; Zeitschr. Malakozoologie (Menke & Pfeiffer), 1849, p. 184. 



Description. — Shell characterized by its rounded posterior 

 margia and rather shallow valves, ornamented with numerous 

 regular, concentric, and rather obsolete plications. 



Eemaeks. — An imperfect right valve contained in this collection 

 appears to be closely allied to this species, and differs chiefly in 

 exhibiting a strongly pronounced concentric sculpture. It, however, 

 compares favourably with a recent specimen from the Red Sea in 

 the British Museum identified as this species. 



Dimensions. — Height, 50 mm. ; length, 60 mm. ; diameter, about 

 12 mm. 



Horizon. — Miocene (Burdigalian). 



Distribution. — Egypt : Camp 6. Coll. Geol. Surv. Egypt, 

 No. 640, Box No. 51^ a. 



MERETRIX LAMARCKI, Agassiz, sp. 

 Cytherea nitidula, Basterot, " Besc. Geol. Tert. Sud-Ouest France": Mem. Soc. 



Hist. Nat. Paris, vol. ii (1825), pt. 1, p. 91, non Lamarck. Goldfuss: Petre- 



facta Germanise, vol. ii (1840), p. 239, pi. cxlix, fig. 11. 

 Cytherea LamarcM, Agassiz, " IconograpMe Coquilles Tertiaires " : Nouv. Mem. 



Soc. Helvetique Sci. Nat., vol. vii (1845), p. 39, pi. vii, figs. 1-4. Hoernes, 



" Foss. Moll. Tert.-Beck. Wien" : Abhandl. k. k. geol. Reichs., vol. iv (1861), 



p. 153, pi. xviii, fig. 5. 



Description. — Species ovate, transverse, ventricose, inequilateral ; 

 wide and round anteriorly and in rear ; lunule prominent ; posterior 

 area lanceolate ; margins closed. 



Dimensions. — Height, 44 mm. ; length, 56 mm. ; diameter, 28 mm. 



Remarks. — An internal cast of both valves in sitH represents this 

 shell. Its careful comparison with the excellent figures of Agassiz 

 and Hoernes leaves no room for doubt that it belongs to this form. 

 The elegant rounded and ventricose character of this species is well 

 maintained in the specimen. 



Horizon. — Miocene (Burdigalian). 



Distribution. — Bordeaux ; Westphalia ; Vienna Basin, etc. 

 Egypt : Camp 6. Coll. Geol. Surv. Egypt, No. 641, Box No. 52^ a. 



[BIVALVE : INBETERMINABLE.] 



Remarks. — A badly preserved specimen — not identifiable, but 

 probably belonging to the genus Meretrix. 



Horizon. — Miocene (Burdigalian). 



Distribution. — Egypt : Camp 6. Coll. Geol. Surv. Egypt, 

 No. 640, Box No. 51^ a. 



Genus VENUS, Linnseus. 

 Systema Naturae, lOth ed. (1758), p. 684. 

 Type. — Yenus chione, Linnseus. 



VENUS BURBIGALENSIS ?, Mayer-Eymar. 

 Venus Burdigalensis, Mayer-Eymar : Journ. Conchyliologie, ser. ii, vol. iii (1858), 

 p. 298; ibid., ser. ii, vol. iv (1860), pi. v, fig. 4 ; Syst. Verz. Foss. Reste 

 Madeira, etc., 1864, p. 19. Hoernes, "Foss. Moll. Tert.-Beck. Wien": 

 Abhandl. k. k. geol. Reichs., vol. iv (1861), p. 129, pi. xv, fig. 1. 



