148 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jlllie 17, 



109. Helix Bestii, sp. nov. PI. X. fig. 2, a-c. 



Shell small, depressed above, forming an obtuse angle on the body- 

 whirl ; under-side tumidly convex ; about four whirls ; umbilicus 

 moderately sized and deep ; slightly reflected peristome. 



Dimensions. — Diameter y^ths, elevation y<jths of an inch. 



This species was found associated with Helix DuBoisii and Bulimus 

 Sharmani, &c, in light-brown marl. 



Loc. Gorge of Iphigenia. 



Dedicated to Edward Best, Esq., of the Geological Survey of 

 Great Britain. 



110. Bulimus Sharmani, sp. nov. PI. X. fig. 3, a, b. 



Shell small, obtusely turreted ; whirls 5 to 7, more or less irre- 

 gular in form and number ; aperture oval. 



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



Loc. Gorge of Iphigenia. 



Dedicated to George Sharman, Esq., of the Geological Survey of 

 Great Britain. 



111. Planorbis obesus, sp. nov. PI. X. fig. 5, a-c. 



Shell small, orbicular, and very stout, having six whirls, which 

 almost cover each other ; aperture compressed and oblique. 



Dimensions. — Diameter yth, thickness of outer whirl y\ftfi of an 

 inch. 



Found associated with the previously described land-shells, Nos. 

 108, 109, and 110. 



Loc. Gorge of Iphigenia. 



112. Planorbis cornucopia, sp. nov. PI. X. fig. 4, a, b. 



Shell large, formed of four nearly round volutions separated by a 

 deep suture, the outer volution having two or three transverse con- 

 strictions. 



Dimensions. — Diameter 1 inch, thickness of outer whirl -^-ths of 

 an inch. 



Loc. Of this elegantly formed freshwater shell, the finest spe- 

 cimen is in the Woolwich Royal Artillery Institution, collected from 

 before Sevastopol by Major Anderson, R.A. One other specimen 

 was obtained by Captain Cockburn from the Gorge of Iphigenia 

 (bed P of the section). 



113. Cyclostoma reticulatum, sp. nov. PI. X. fig. 6, a, b. 



Shell turbinated; surface spirally striated and crossed by very 

 fine transverse lines ; axis perforated ; aperture nearly circular ; 

 whirls 4 or 5. 



Dimensions of imperfect cast. — Axis y^-ths, diam. y^ths °f an mcn * 



This cast retains a portion of the shell attached, showing distinctly 

 its reticulated sculpture. 



Loc. Gorge of Iphigenia (bed C of the section). Associated with 

 the land-shells before described. 



Prosobranchiata. 

 114. Turbo, sp. Casts of a large turbinated shell, which may 



