54 ON THE NAIADES, 



thickness and reflection of the h'p. The last whorl is very round — 

 the umbilicus large and partly covered. 



Helix mamilla. Plate XIX. fig. 64. 



Testa solidd, elevata, obtuso-conica, inferne rotundata, imjierforata, colore colum- 

 bino tincid, longitudinaliter nitide striata, fasciis duabits obsoletis indutd, apice 

 subrtifo ; anfractibus qiiinis, rotundatis ; spirci exserta ; apertiira subrt/fd, ovatd ; 

 labro subrejlcxo, crasso, prope basin majori ; columella Ixvi, ad basin subconcavd. 



Shell solid, elevated, obtusely conical, rounded below, imperforate, dove coloured, 

 transversely and finely striate, with two obsolete bands, pink at the apex ; whorls five 

 and rounded ; spire elevated ; aperture pink, oval ; outer lip somewhat reflected, thick, 

 enlarged towards the base; columella smooth, at the base impressed. 



Hab 



My Cabinet. 

 Diam. -8, Length -7 of an inch. 



Remarks. — I have rarely met with a more beautiful and interesting 

 species of the genus than the above. It is eminently distinguished by 

 its solidity, its thick, smooth and beautifully coloured lip, its fine deli- 

 cate colour, and its elevated and red tipped spire. The columella is 

 somewhat thickened and deeply impressed at the base. 



It is to be regretted that the habitat of this species is not known. 

 It was met with accidentally at a dealer's. 



Helix diaphana. Plate XIX. fig. 65. 



Testa lata, svperne depressa, inferne inflatu, longitudinaliter et nitide striata ; 

 subluted, obscure bifasciatd super medium anfractum, ximbiUcatd ; anfractibus 

 quaternis ; spird planulaia ; apertura magna et subrotundd; labro simplici; colum- 

 ella brevissimd Ixvique. 



Shell wide, depressed above, inflated below, longitudinally and finely striate, pale 

 yellow, obscurely banded above the centre of the whorl, umbilicated ; whorls four; 



