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GASTEROPODA OF THE INFERIOR OOLITE. 



227. Ambeeleya, cf. pinguis, Deslongchamps, 1860. Not figured. 



18G0. Eucyclus pinguis, Desl. Bull. Soc. Linn. Norm., v, p. 145 (p. 30 sep. 



c °py)» pi- xi > fig- 7 - 



Mr. Tawney found an indifferently preserved specimen of Amberleya at Midford, 

 which he referred to Amb. {Turbo) princeps, Romer. Recently Mr. Wilson has 

 found another specimen, which is not calculated to throw much additional light on 

 the subject. These fossils more resemble Eucyclus pinguis, Desl., than any other 

 figured species. The calcareous beds at Midford are mainly within the Parkin- 

 soni-zoue. Eucyclus pinguis is quoted from the primordialis-zone. 



There are one or two other ill-defined forms of Amberleya, which I have 

 concluded not to notice on the present occasion. 



Genus — Littoeina, Ferussac, 1821. 



Shell turbinate, thick, pointed, few-whorled ; aperture rounded ; outer lip acute, 

 columella rather flattened, imperforate. 



Tectarius, Valenciennes, 1833. Shell muricated or granulated, sometimes with 

 am, umbilical fissure ; columella callous, partially toothed at the base. 



Echinella, Swainson, 1840. Shell granulated, thick; base of the columella 

 toothed. 



From what has already been said, the true affinities of the shells about to be 

 described are somewhat uncertain. They differ from the Amberleyas principally 

 in having a small and thick shell. Most of them seem to have more affinity with 

 Tectarius or Echinella than with Littorina, nor can I in all cases strictly define 

 the difference between Amberleya and Littorina. It must be understood that in 

 the succeeding pages Littorina is used partly in a conventional sense. 



228. Littorina (Eohinella) prtetoe, Goldfuss, 1844. Plate XXIV, fig. 8. 



1844. Turbo praetor, Goldf. Petref., pi. cxciv, fig. 8. 



Cf. also Turbo Meriani, d'Orb.. non Goldf., T. J., ii, pi. cccxxxv, fig. 5, non 



figs. 2—4. 



Description : 



Length . . . . .25 mm. 



Length of body- whorl to total height . . 52 : 100. 



Spiral angle .... 55°. 

 Shell pyramidal. Number of whorls about seven, flat, increasing under a 

 regular spiral angle, and well separated by the suture. The ornaments consist of 



