652 ME. R. B. NEWTON ON [Nov. I9II, 



Alectryonia cf . plicatula (Gnielin). 

 Miocene (Helvetian-Tortonian). Gubah. (See p. 626.) 

 Fig. 11. External view of a lower valve, showing the tubular character of 

 the plications. 



Anadara cf. turonica (Dujardin). 

 Miocene (Helvetian-Tortonian). From Merj Plain to Wadi Hamema. 

 Fig. 12. Outer aspect of a left valve. 1 Q r9s 



13. Surface-structure. X 3. J ^ ee P ' °^ 



Strombus cf. coronatus Defrance. 

 Miocene (Helvetian-Tortonian). Gubah. 

 Fig. 14. Dorsal view of natural cast, (See p. 626.) 



Plate XLIV. 



Ostrea cf. caudata Minister. (See p. 629.) 

 Miocene (Aquitanian). East of shrine of Sidi Mahomet Mahridi, 

 east of Slonta. 

 Fig. 1. External view of a lower valve, showing attachment-surface. 



Spondylus cisalpinus Brongniart. 

 Miocene (Aquitanian). Ain Sciahat (above camp). (See p. 630.) 

 Fig. 2. External view of specimen, showing the surface of the larger valve. 



Oopecten rotundatus (Lamarck). 

 Miocene (Aquitanian). Wadi Umzigga. (See p. 634.) 

 Fig. 3. External view of a valve with an imperfect apical region. 



Mquipecten cf. pasinii (Meneghini). 

 Miocene (Aquitanian). Ain Sciahat (above camp). (See p. 632.) 

 Fig. 4. Outer view of a left valve. 



5. Portion showing details of sculpture. X 3. 



Mquipecten haueri (Michelotti). 

 Miocene (Aquitanian). Birlibah. (See p. 634.) 

 Fig. 6. External view of a fragmentary valve. 



Plate XLV. 

 Ostrea crassicostata G. B. Sowerby. (See p. 630.) 

 Miocene (Aquitanian). East of shrine of Sidi Mahomet Mahridi, 

 east of Slonta. 

 Fig. 1. External view of a lower valve, half the natural size. 

 2. Inner view of same specimen, half the natural size. 



Pecten vezzanensis Oppenheim. 

 Miocene (Aquitanian). Ain Sciahat. (See p. 631.) 

 Fig. 3. External view of specimen. 



4. Sculpture details of the same. X 3. 



Mquipecten camaretensis (Fontannes). (See p. 633.) 

 Miocene (Aquitanian). Fountain of Apollo, Cyrene. [B.M. — L 16341.] 

 Fig. 5. View of a well-preserved valve. 



6. Sculpture details of the same. X 3. 



