﻿AMBERLEYA. 



283 



Amb. densinodosa serves to connect the more eucycloid species of Amberleya 

 with the IVr&o-section through such a species as Amberleya Milleri. Intermediate 

 forms occur. 



212. Amberleya, cf. Mbeiani, Gold/., 1844. Plate XXIII, fig. 17. 



1844. Turbo Meeiani, Goldfuss. Petrel'., vol. iii, p. 91, pi. csciii, fig. 16. 



Bibliography, fyc. — Goldfuss originally described Turbo Merloni as from the 

 Upper Lias of Altdorf and the Inferior Oolite of Normandy. He also quoted it 

 from the Oxford Clay of Dives. Subsequently it has been regarded mainly as an 

 Oxfordian species. It seems, on the whole, to answer to one of those more or 

 less recurrent forms which do occasionally show themselves on more than one 

 horizon. 



Description. — The form to which I now draw attention is evidently a member 

 of the ornata-gromp, of moderate size and somewhat more elaborate ornamentation 

 than the regular Amb. ornata. 



Length about . . . .20 mm. 



Length of body-whorl to total height . . 60 : 100. 



Spiral angle . . . 46°. 



The whorls have four spirals (the secondary spirals mentioned by Goldfuss 

 not always to be seen), and the tuberculations are proportionately large. The 

 aperture ovate, but with the columellar lip produced anteriorly (not rounded off 

 as in Goldfuss's figure). The body-whorl is ventricose, and longer in proportion 

 to the spire than is usual with members of the ornata- group. 



Relations and Distribution. — There are smaller varieties which seem to connect 

 with Littorina Phillipsii, which is probably nothing more than a variety. Occurs 

 at Weldon and Ponton in the Lincolnshire Limestone, and in the Scarborough 

 Limestone at Cloughton Wyke. 



213. Amberleya cygnea, sp. nov. Plate XXIV, fig. 10. 



Description : 



Length, full size . . . .35 mm. 



Length of body- whorl to total height . . 50 : 100. 



Spiral angle .... 46°. 



Shell eucycloid, turrited. Spire pointed, but with an obtuse apex. Whorls 

 seven or eight, sub-biangulate, suture wide. The first whorls on which ornaments 



