J88().] LAND-SHELLS OF MENTON. 10;") 



yated, quite central, the six and a lialf whorls moderately convex, and 

 increasing very gradually and regularly, the last one very abruptly 

 deflected, not dilated near its termination, as in the preceding, more 

 convex at its base ; umbilicus a good deal less open ; aperture per- 

 fectly rounded, instead of laterally produced, with columeliar margin 

 nearly straight, instead of very oblique. 



Alt. 13}, diam. 19f ; aperLalt. 10, lat. 9 millims. From deposit C. 



Hyalina (Retinella) likes, n. sp. 



T. depressa, superficie late ac aperte umbilicata, supra distincte 

 subregulariterque striata ; anfractus 5|, vix convexi, ultimo rapide 

 crescente, late dilatato, haud descendente, ad peripheriatn suhan- 

 gulariter compresso, ad basimfere applanato, vix convexo ; aper- 

 tura paulidum comp)ressa, lunato-ovata, margine columellari re- 

 flexo, perobliquo. 



Easily distinguished from all varieties of Ihj. oUvetorum, in espe- 

 cial by the sliallow, instead of solariform, umbilicus; the last whorl 

 also is much more narrowly compressed, flatter at base, and not de- 

 flected J the whorls are fewer, the spire much more depressed, with 

 the sculptured striae more distinct. Of rare occurrence in deposits 

 A and B, abundant in D ; unfortunately always in bad preservation, 

 and apparently the greater number young specimens. I also found 

 it by no means rare at Cape Vieille (?zone of H. paretiana). 



Alt. 9, diam. (prox.) 13; apert. alt. (prox.) 7, lat. 8 millim. 

 From deposit A. 



Alt. 5|, diam. 1 1 milHm. Common form, ?young, from deposit 1). 



Type, Indian Museum, Calcutta ; also in coll. of M. J. R. Bour- 

 guiguat. 



Hyalina glabra, Studer. 



T. spira paululum elevata, peranguste perforata, cornea, nitidissima, 

 supra (sub lente) delicate striatula ; anfractus 5^, hand co?ivexi, 

 ultimo rapide crescente, ad peripheriam subangulato, basi vix con- 

 vexo ; apertura perumpla, lunato-ovata, margine externo pro- 

 ducto, yradatim rotundato, margine columellari reflexo, subrecto. 

 Alt. 7f, diam. 14^; apert. alt. 6, lat. 7f millim. 

 This species was very rare in deposit C, did not occur at all in A, 

 B, E, or F, but was very common in D, unfortunately always in bad 

 preservation and more or less broken. It appears to vary scarcely at 

 all as regards elevation of the spire, distinct but very narrow per- 

 foration, and the large laterally produced aperture. 1 did not find 

 any recent specimens ; nor is it recorded from the deposit by Risso. 

 Type, Indian Museum, Calcutta ; also in coll. of MM. Eourguio-nat 

 and Williams. ^ 



Hyalina blondiana, Bourg. (Desc. Moll, Alpes-Marit. 1869, 

 near Grasse, as Zonites, sp. ; alt. 6, diam. 1 5 millim.). 



Moderately abundant in the vicinity of Menton, agreeing exactly 

 with the original description ; the diff"erence in height, ^recorded 

 below, is perhaps owing to our having diff"ercnt methods of measure- 



