54 MOLLUSCA FROM THE GREAT OOLITE. 



Shell small, turbinated, acute; whorls very convex, and thrice carinated; carinae 

 crenulated, the upper one placed near to the suture ; the others about the middle of the 

 whorl, and near together; the last whorl has near to its base very fine encircling lines; the 

 aperture is small, and nearly orbicular. 



In this minute shell the largeness and roundness of the carinae, and the great convexity 

 of the whorls are the most prominent features. 



Locality. We have procured two specimens from the white stone of Bussage ; but in 

 this, and probably other instances of minute shells, the small number known may indicate 

 rather our defective observation than the true relative numbers which they present. 



RISSOINA? L^VIS, Sow. Plate IX, fig. 16. 



RISSOA LEVIS, Sow. 1829. Min. Con., t. 609, fig. 1. 



Brown. Illust. Foss. Conch., p. 79, t. 38, fig. 12. 

 Bronn. Index Paheont., p. 1092. 



R. Testa pared, turritd, leevi, subcylindricd; anfractibus (6) subplanatis; anfractu 

 penultimo, et ultimo subcylindrico ; aperturd parvd, obliqud. 



Shell small, turreted, pointed, smooth, and subcylindrical ; whorls (6) rather flattened ; 

 the last whorl, and also the penultimate whorl, are nearly cylindrical ; aperture small and 

 oval, oblique. Length 2| and 3 lines. 



Locality. Ancliff ; also very rarely at Minchinhampton Common, where it has been 

 found in the planking. 



This species scarcely exhibits the anterior notch characteristic of Rissoina. 



PAGODUS, Gray. 



Sub-genus AMBERLYA. 



P. Testa turritd, turbinatd, apice acuto; anfractibus superne plants, infra convexis et 

 nodulatis; anfractu ultimo ventricoso; aperturd ovatd, integrd, labio interno calloso umbili- 

 cum vix obtigente ; suturis profunde impressis; columelld nulld. 



Shell turreted, turbinated, apex acute ; whorls flattened above, convex, and nodulated 

 beneath, the last whorl ventricose ; aperture ovate, entire ; inner lip thickened, and nearly 

 covering a small umbilicus ; sutures deeply impressed ; no columella. 



The whorls are received into the concavity of those which succeed, the latter at then- 

 junctions being slightly overwrapped by the former, after the manner of Scalaria ; the 

 aperture is oval and oblique ; the outer lip thin ; the figure varied somewhat according to 

 the stage of growth, the last one or two volutions in adult specimens becoming more tumid 

 than the others ; in such examples, therefore, the spire acquires a slightly concave figure. 



