MIOCENE MOLLtrSCA OE LAKE UUMI. 447 



Brongniart's original example of this species was obtained from 

 the Oligocene (Tongrian) rocks of Castel Gomberto of Nortli 

 Italy (this correlation being according to Lapparent, ' Traite 

 de Geologie,' 1893, p. 1292). Under the name of V. granosa it 

 has been recorded from tlie Miocene (G-aj series) deposits of 

 Cutch, India (J. de C. Sowerby) ; it occurs in the Vienna Basin 

 at Gauderndorf &c. (Homes), in the Lower Miocene or Burdiga- 

 lian stage ; " Urmia Plateau " (Abich) ; Asia Minor (P. Fischer); 

 Saucats ; Turin, &c. 



Locality. Guverjin Kala, north end of Lake Urmi. Specimen 

 having a reddish-brown colour externally; the matrix within 

 appearing to be a grey, marly, calcareous rock. (Collected by 

 the Eev. C. Labaree.) 



Formation. Miocene (Burdigalian or Aquitanian). 



Mebeteix PEESiEisrsis, n. sp. (Plate 30. figs. 3-5.) 



Shell transversely ovate, inequilateral, anterior end truncate 

 and short, posterior extremity rounded and produced ; valves 

 convex, dorsal margin rounded and long, surface ornamented 

 with concentric sulcations ; beaks very anterior, incurved, having 

 beneath, a small, fairly deep, cordiform lunule ; escutcheon 

 lanceolate. 



i)^»^ews^o;^s (in millimetres). Height = 28; length =45; depth 

 =29. 



This species is represented by one specimen having both its 

 valves united. It appears to differ from other forms of this 

 genus in its transverse shape, the very anterior position of the 

 umbones (which come beyond the shell-margins below), and 

 the very convex rounded valves, which slope obliquely to the 

 posterior and ventral margins. 



The specimen is quite free from external matrix, its lithological 

 aspect being similar to that observed in the forms of Venus 

 Aglauroe and Meretrix like incrassata. 



Locality. Guverchin Kala. (Collected by the Eev. C. Labaree.) 



Formation. Miocene (Burdigalian or Aquitanian). 



Meeeteix allied to inceassata, J. Soioerby. (Plate 30. 

 figs. 6 & 7.) 



Venus incrassata, J. Sowerby, Mineral Conchology, 1817, vol. ii. pi. 155. 

 figs. 1, 2. _ 



Cytherea incrassata, Deshayes, Desc. Coq. Foss. Paris, 1825, vol. i. 



