132 MR. G. NEVILL ON THE [Feb. 17, 



Clausilia (Iphigenia ?) BizARELLiNA, Bourg. Hist. Clausil. 

 France, 1877. 



I am indebted to M. Bourguignat for the above identification. 

 Specimens of this group abounded in countless curious varieties 

 (? species) in all the deposits A, B, C, D, E, and F. We did not 

 find any living forms of this subgenus ourselves ; but numerous 

 species have been described from the higher elevations in the neigh- 

 bourhood by Risso and Bourguignat. 



Clausilia (Iphigenia?), sp. 



A certainly distinct form from the preceding, and which I only 

 found in deposit D. As I have already said, it is hopeless to attempt 

 to identify these species without figures. There can be little doubt 

 this is one of the many new species of this group described by 

 M. Bourguignat, loc. cit., from the department. 



Clausilia (subgenus ?) paulucciana, n. sp. (Plate XIV. fig. 1 . ) 

 Testa parva, rimata, fusiformis, tenuiuscula, cornea, hand nitens, re- 

 gulariter ac eleganter costulata, costulis distantibus, subrectis ; 

 apex obtusiusculus, turgidus at quasi mamillatus ; anfr actus 10, 

 supremi 3 convexi, IcBvigati, tumidi et mamillati, 3 sequentes con- 

 tract!, plus minusve convexi, sensiin crescentes, 4 ultimi subtumidi, 

 convexi, fere aquales, ultimus subglobulosus, oblique rugoso-cos- 

 tulatus, basi acute ac distanter cristatus ; apertura subpyrifor- 

 mis, haud eversa, lamella parietali superiore subrecta, plica spirali 

 inconspicua ; lamella parietalis inferior valde ascendens, remota, 

 postice subbifurcata ; plica subcolumellaris immersa, inconspicua ; 

 plica palatalis unica, supera, sat conspicua ; perist. sensim solutum, 

 continuum, expansiusculum ac reflexiusculum. 

 Long. 8|— 9, diam. 2; apert. long. l|minim. 

 This charming little species appears to have been very rare. 

 However we managed to procure about thirty specimens after much 

 searching. It only occurs in deposits B and C. It is one of the 

 most distinct and curious of all the Western-European forms. It 

 varies a trifle in the greater or less convexity of the whorls ; other- 

 wise it appears to be wonderfully constant, especially as regards the 

 three peculiar apical whorls, the general sculpture, and the aperture. 

 The apical whorl is small and subobtuse, the next two swollen, 

 tumid, and submamillate, all three being perfectly smooth ; the 

 next two are smaller (more contracted), regular, scarcely convex, 

 and of almost equal size ; the other five whorls are more or less 

 rapidly swollen, the last three being of approximately equal height. 

 The last whorl is more or less subglobose (varying somewhat) ; the 

 sculpture is fairly constant, the last seven whorls being beautifully 

 and distinctly costellated with nearly perpendicular, distant, subacute 

 ribs ; these on the last whorl, however, become more oblique, and 

 near the peristome are very acute (" cristate " as it were). The 

 aperture is detached from the last whorl in a very characteristic 

 manner, though not everted ; it becomes in old specimens sub- 

 callose. 



