XKRITID.E. O 



imifoi'ine curvato, postice (vel supra) anc^ulata, labio iiicrassato, 

 levissiine arcuato, supra paululmn dilatato, intra aiigustiore. 



Alt. 18, alt. iilr. aut". ad apert. "8, diam. maj. r'J, diaui. niin. 

 1 mm. 



Aperture : diam. "5 mm. 



Hab. Farm Caves, near Moulinein. 



Family NERITID.E. 



Subfamily NERITIN.E. 



Shell imperforate, subglobular or subpatelliform ; operculum 

 caLareotis, the internal surface furnished with' projecting apo- 

 physes, the internal margin being thus articulated to the columellar 

 septum. 



DistrUnit'ton. Temperate and Tropical Eegions of the World. 



Genus THSODOXIS [N'eritina']. 



Theoiloxis, de Montfnrt, Conch. Syst. ii, 1810, p. 350. 

 Aeritifut, Lamarck, 1822 [Neritine, 1809]. 



Type, T. lutetianus, de Montfort {flaviatUls, Linu.) ; Europe. 



Range. Temperate and Tropical Eegions of the World. 



Sliell globular, oval, or turriculated, smooth or spirally striated, 

 often adorned with vivid and varied colours; inner lip septiforra, 

 crennlated, rarely simple. 



0. Theodoxis perotetiana {Becluz). 



Xeritiiui ])e)-of.etiana, Recluz, Rev.Zool. Cuv. 1841, p. 333; Sowerby, 

 Thes. Conch, ii. pi. 115, fiirs. 200, 201 ; Reeve, Con. Icon., Ner. 

 sp. 124; II. & T., C. I. pi. 157, ligs. 2, 3. 



Original description: — Testa ovato-semiglobosa, fusco-nigricante, 

 tenuissime striata ; anfractibus tribus : ultimo superne coarctato ; 

 spira brevi, convexa, obtusata; apice pallido, sub-hyalino; aper- 

 tura extus rotundata ; labio piano, albido, in medio vix arcuato 

 obsoleteque crenato. 



Alt. 9, diam. 11 ram. 



JIab. JSti'eams of the Nilgherries. 



T. ceylonenfiis (Eecluz), J. Conch. 1851, p. 202, appears to be a 

 variety having an orange edge to the otherwise black operculum. 



10. Theodoxis fuliginosa {Theobald). 



Xerithia fuliijiiuxn (Theobald), J. A. S. B. xxvii, 1859, p. 315. 

 Neritina reticularis, var. capillvlata. Sow. The?. Conch, ii, pi. 156, 

 tigs. 265, 266 ; H. & T., C. I, pi. 157, figs. 8, 9. 



Original description : — Testa neritinseformi, subglobosa, spira 



