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GASTEROPODA OF THE INFERIOR OOLITE. 



The aperture is wide, subcircular, with scarcely any trace of anterior canalicu- 

 lation, though slightly flattened in front. 



Relations and Distribution.— -Differs from Amberleya turbinoides in its more 

 globose character, and in its freedom from angularity in the whorls of the spire. 

 Less trochiform, and with finer and more nodular ornaments than Amb. Milleri. 

 The eucycloid character is almost at a minimum. Rare at Dundry, and not 

 found elsewhere in England. 



N.B. — Mr. Tawney relied upon the alternate arrangement of the markings to 

 differentiate Turbo Stoddarti from Turbo cyclostoma, a well-known but much 

 smaller Liassic species. It is not improbable that, after all, Turbo Stoddarti, as 

 interpreted in the present instance, is to a certain extent little more than an 

 amplification of a Liassic form. Lately Mr. Wilson has found some specimens 

 of Turbo cyclostoma which show traces of the nacreous layer. Hence, though not 

 really a Turbo, it is likely to be one of the Turbinidse. The bearing of this upon 

 Amberleya generally and associated forms must not be lost sight of. 



225. Amberleya (Tuebo) elongata, sp. nov. Plate XXIII, figs. 8, 9. 



Cf. Tuebo terebbatus, Milnst. Goldf., Petref., pi. cxciv, fig. 6. 

 Description : 



Length, full size . . . . .60 mm. 



Length of body-whorl to total height . . 45 : 100. 



Spiral angle . . . .36°. 



Shell conical-elongate, turbinate, turrited. Number of whorls about nine, 

 convex, widely separated by the suture ; axial stride fine and numerous. 



Smaller Specimen. — Five spirals in the earlier whorls, six in the penult and 

 body -whorl, the fourth being slightly the most prominent ; base full and orna- 

 mented by numerous plain spirals. Aperture ovate-elongate, with a straight 

 pillar-lip and indications of a shallow anterior canal. 



Larger Specimen. — The penult has seven spirals, the body-whorl about eight, 

 exclusive of the spirals in the base, which are numerous. The body-whorl is 

 ventricose ; aperture apparently subcircular. 



Although the differences between the smaller and larger specimens are 

 considerable, yet they may be regarded most probably as representing different 

 stages of the same species. The rotund outline of the whorls, the elongate spire, 

 and the character of the ornamentation are greatly similar. The spiral angle, 

 too, is almost the same, if we exclude the ventricose projection in the body-whorl 

 of the larger specimen. 



