440 ME. E. B. FEWTON ON TEE 



LaMELLTBEA-NCHIATA. 



OSTEEA PSEUDODIGITALINA, Fuchs. 



Ostreapseudodigitalina, Fuclis, Denkschr. K. xlkad. Wiss. 1879, vol. xli. 

 pi. 2, pi. 3. figs. 4-6, p. 107. 



This species is of elongate shape, pointed at the summit 

 and rounded basally ; it is related to O. digitata of Eichwald, 

 but appears to differ in possessing costae of considerably less 

 digitiform character. The upper valve is flat and ornamented 

 with prominent growth-lines. Other closely allied species are 

 O. Blioysi of Puchs, from the Siokuh mountains in Persia, and 

 O. digitalina var. Mholfsi of the same author, from the Miocene 

 beds of Egypt. The specimens are fragmentary ; representing 

 four lower valves and three upper valves. 



Euchs first recorded this species from the Miocene (=Schio- 

 Schichten) of the Siokuh mountains in Persia. 



Locality. la a grey marly matrix from the beach of the 

 island of Koyun Daghi. 



Formation. Miocene (Helvetian ?). 



OsTEEA LAMELLOSA, BrOCcM. 



Ostrea lamellosa, Brocchi, Conch. Foss. Subapennina, 1814, vol. ii. 

 p. 564 ; Abich, Mem. Ac. Imp. Sci. St. Petersbom-g, 1858, ser. 6, vol. vii. 

 pi. 5. fig. 3, p. 126 (68) ; Homes, Abhandl. k.-k. Gaol. Reiebs. 1870, 

 vol. iv. pi. 71. figs. 1-4, pi. 72. figs. 1, 2, p. 444. 



A single fragmentary upper valve is all that represents this 

 shell; and it seems to agree remarkably well with Abich's 

 interpretation of the species as illustrated in his " Steinsalz " 

 monograph. It is slightly convex near the summit, and the 

 external surface exhibits the regular concentric and lamellosa 

 striations characteristic of this species. It has been previously 

 recorded from Italy (Brocchi) ; Urmi (Abieh) ; Yienna Basin 

 (Homes) ; Asia Minor (P. Eischer in Tchihatcheff) ; Greece 

 (Gaudry), &c. 



Locality. In a grey marly rock from the beach of the island of 

 Koyun Daghi. 



Formation. Miocene (Tortonian or Helvetian). 



The species is distributed through the Miocene and Pliocene 

 periods, and still survives in the Mediterranean. 



Alectetoista Yieleti, Deshayes. 



Ostrea Virlfti, 0. excavata, 0. j^sendoedulis, Desliayes, Exped. Sci. 

 Moree, 1833, vol. iii. (ZooL), pi. 21. figs. 1-6, pp. 122-124. 



