R. Bullen Weuion — Miocene Shells from Egt/pt. 215 



Eemarks. — Three internal casts of a Venus with attached valves 

 are referred doubtfully to this species. They are of similar 

 proportionate size to the type, and preserve the same obliquely 

 curved outline of the dorso-posterior area. The lunula is large 

 and deeply excavated, whilst the escutcheon is long, wide, and 

 lanceolate. No pallial impression is seen, and the muscular scars 

 are nearly obsolete. 



Dimensions. — Height, 60 mm. ; length, 68 mm. ; diameter, 38 mm. 



Horizon. — Miocene (Burdigalian). 



Distribution. — Bordeaux ; Vienna Basin ; Island of Baixo, 

 Madeira. Egypt : Camp 6. Coll. Geol. Surv. Egypt, No. 1,002, 

 Box No. 4:7c. 



VENUS, sp. 



Remarks. — Eepresented by two imperfect casts, which exhibit 

 a deep excavation beneath the beaks corresponding to the lunule ; 

 on the other side is a prominent lanceolate depression representing 

 the escutcheon area. A concentric lamellose ornamentation is 

 somewhat obscurely seen in one of the specimens. They are 

 probably the moulds of Venus plicata, Gmelin. 



Dimensions. — Height, 35 mm. ; length, 40 mm. ; diameter, 23 mm. 



Horizon. — Miocene (Tortonian). 



Distribution. — Egypt : Camp 9. Coll. Geol. Surv. Egvpt, 

 No. 642, Box No. 53^ a. 



EXPLANATION OF PLATE VIII. 



TuRRiTELLA TEREBRALis, Lamatck. Helvetian of Jebel Geneffe. 

 Fig. 1. — Several examples on a small slab of yellowish sandstone. 



Pyrula condita, Brongniart. Helvetian of Camp 22. 

 Fig. 2. — Back view of specimen. 

 Fig. 3. — Front aspect, showing aperture. 



Cancellaria, sp. Helvetian : between Camps 19 and 22. 

 Fig. 4. — Front aspect of shell. 

 Fig. 5. — Back view of same specimen. 



Amussium cristatum, Bronn, sp. Tortonian: probably from Camp 21. 

 Fig. 6. — Fragment showing the internal surface of a valve and its pairs of costal 

 rays ; attached to a valve of Fecten acuticostatus. 



Lucina multilamellata ?, Deshayes. Helvetian : between Camps 19 and 22. 

 Fig. 7. — Cast of specimen with indications of radial striae. 



EXPLANATION OF PLATE IX. 



OsTREA FucHSiANA, sp. nov. TortoniEn : from Camp 19. 

 Fig. 1. — External view of lower valve, exhibiting the radial ridges and spines. 

 Fig. 2.- — Internal view of same specimen, showing small ligamental area and extensive 

 muscular scar. 



Cardium, sp. Tortonian : Camp 9. 

 Fig. 3. — Cast of a specimen showing vertical striation. 

 Fig. 4. — Umbonal view of same specimen. 



[The figures on both Plates are drawn natural size.] 



