AMBERLEYA. 283 
Amb. densinodosa serves to connect the more eucycloid species of Amberleya 
with the Turbo-section through such a species as Amberleya Milleri. Intermediate 
forms occur. 
212. AmperLeya, cf. Mertant, Goldf., 1844, Plate XXIII, fig. 17. 
1844. Turso Mertant, Goldfuss. Petref., vol. iii, p. 91, pl. exciii, fig. 16. 
Bibliography, §c.—Goldfuss originally described Turbo Meriani 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-group, of moderate size and somewhat more elaborate ornamentation 
than the regular Amb. ornata. 
Length about : : . 20mm. 
Length of body-whorl to total Reont . = *60)2 100: 
Spiral angle : so Ars 
The whorls have four spirals (the Reconsdary 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 : . 39mm, 
Length of body-whorl to total een : . 00's 100, 
Spiral angle 3 46°, 
Shell eucycloid, turrited. Spire pointed, but aah an ayttine apex. Whorls 
seven or eight, sub-biangulate, suture wide. The first whorls on which ornaments 
