Vol. 60.] THE DISTRICT SURROUNDING- THE DARDANELLES. 281 



and fragments of Mytilus edulis. The appearance of the last- 

 named among lacustrine species need not be wondered at, as it has 

 been recorded as living in the Caspian and Black Seas by S. P. 

 Woodward ' and other authorities. 



(A) List of lacustrine shells from the Gallipoli Conglomerate. 



Lamellibranchia. 



Dreissensia polymorpha (PalJas). 

 Drcissensia Tschaudce, Andrussov. 

 Didacna crassa, Eichwald. 



(B) List of lacustrine shells from the Hora Conglomerate (130 feet). 



Gastropoda. Lamellibranchia. 



Neritina fluviatilis (Linnasus). Dreissensia polymorpha (Pallas). 



Didacna crassa, Eichwald. 

 Mytilus edulis, Linneeus. 



Miocene (Pontian). 



The collection contains a few lacustrine mollusca, which prove 

 the presence of Pontian deposits in the region of the Dardanelles. 

 Prof. S. Stefanescu 2 appears to be the principal authority on the 

 Pontian and the succeeding Sarmatian groups of rocks, especially 

 in connection with Rumania, his latest researches being summarized 

 in a ' Thesis ' containing valuable faunistic lists, comparative tables, 

 and a comprehensive bibliography. 



By this it is evident that Dreissensia rimestiensis and Prosodacna 

 cf. stenopleura (both collected by Col. English) are characteristic 

 Pontian shells ; while an equally-typical shell of this stage of 

 the uppermost Miocene is the gastropod, Lyrccea Bonelli, which 

 Dr. Brusina 3 has recorded from Hungary and Servia. 



Species of Pontian age : — 



r Lyrccea Bonelli, Brusina. (PI. XXIV, figs. 5 & 6.) 



Dreissensia rimestiensis, Fontannes. (PI. XXIV, figs. 7 & 8.) 

 Prosodacna cf. stenopleura, S. Stefanescu. (PI. XXIV, figs. 

 i 9 & 10.) 



Locality. — Found in beds occurring above the Nummulitic Limestone, 

 ^ at a brook north of Teke-keui. 



Neritina. 

 Prosodacna. 



Drcissensia. 



Locality. — Keshan (Kara Kaya Dere). 



Planorhis. 

 Melania. 



Locality. — Xear Keshan (Hafus Hassan Tchiflik) 



Planorhis. Anodonta. 



Melania. Prosodacna. 



1 ' A Manual of the Mollusca ' 3rd ed. (1875) p. 69. 



2 These presentee a la Faculte des Sciences de Paris : 'Etude sur les Terrains 

 tertiaires de Rouuianie ' (Lille, 1897) pp. 124-26. See also Fontannes, ' Faune 

 raalacologique des Terrains Neogenes de Rouraanie ' Arch. Mus. Hist. Nat. 

 Lyon, vol. iv (1887) pp. 322-61 & pis. xxvi-xxvii. 



3 ' Iconogr. Moll. Fobs. Tert. Hungariae, &c.' 1902, p. 7 & pi. v, figs. 29-32. 



Q. J. G. S. No. 239. u ' 



