146 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Julie 17, 



97- Cyprina naviculata, sp. nov. PI. IX. fig. 6, a-c. 



Shell oblong, the anterior extremity rounded, posterior very acute ; 



cardinal teeth 2, and a posterior lateral tooth. 



Dimensions. — Height -^-ths, breadth -j%ths of an inch. 



Loc. Quarantine Harbour. The fossils here have their valves 



united ; a fortunate fracture in one specimen exposes the hinge. 



98. Cyprina? triangulata, sp. nov. PI. IX. fig. 9. 



Shell suborbicular, concentrically striated ; umbones prominent 

 and oblique ; muscular impressions oval, pallial line simple. 



Dimensions. — Height 1, breadth 1-^j inch. 



This species is doubtfully referred to the genus Cyprina, none of 

 the specimens showing the hinge, being mostly casts ; but, as it is 

 one of the most numerous of the fossil bivalves from these deposits, 

 it was thought advisable to figure and describe it. 



Loc. It has been collected from Sevastopol by Major Cooke; from 

 Iphigenia and the Monastery by Captain Cockburn (in bed R). 



99. Astarte pulchella, sp. nov. PI. IX. fig. 10, a-c. 



Shell small, suborbicular, concentrically striated ; two cardinal 

 teeth. 



Dimensions. — Height ith of an inch, breadth the same. 



Loc. Nine specimens of this beautiful little species were collected, 

 having both valves united, from the Gorge of Iphigenia (bed J of 

 the section), associated with other small shells. The left valve of a 

 specimen being fortunately removed, the mould and hinge are shown. 



100. Astarte quadrata, sp. nov. PI. IX. fig. 7, a-d. 



Shell very thick, oblong, depressed, somewhat square, concentric- 

 ally striated ; umbones forming a sharp angle ; hinge with two car- 

 dinal teeth, lateral teeth obscure ; pallial line deep, simple. 



Dimensions. — Height ^yths of an inch, breadth 1 inch. 



Loc. Four specimens of this very thick shell were obtained from 

 the Monastery, being fragments of the upper part containing the 

 hinge of both valves well preserved. Several supposed casts of this 

 species (fig. 7, d) were obtained from the same locality. 



101. Venus semiplana, sp. nov. PI. IX. fig. 5, a, b. 



Shell oblong, depressed, concentrically striated, posterior side sub- 

 angular ; umbones anterior and acute ; hinge of right valve with 

 three cardinal teeth (the central one prominent) and one lateral 

 tooth. 



Dimensions. — Height ^ths, breadth -^ths of an inch. 



A single specimen of the right valve only, in good preservation. 



Loc. Gorge of Iphigenia. 



102. Venus minima, sp. nov. PI. IX. fig. 12, a-c. 



Shell elongated oval ; umbones anterior. 



Dimensions. — Height ^ths, breadth j-|th of an inch. 



Three specimens of this very small and beautifully preserved shell 

 with both valves united, were collected from the Monastery and Gorge 



