NBBITIDA 5 



uniforme curvato, postice (vel supra) ansrulata, labio incrassato, 

 levissime arcuato, supra paululum dilatato, infra angustiore. 



Alt. 18, alb. ult. anf. ad apert. '8, diam. inaj. 1*2, diain. min. 

 1 mm. 



Aperture : diam. *5 mm. 



Hab. Farm Caves, near Mouhneiu. 



Family NERITID2E. 



Subfamily NERITINJS. 



Shell imperforate, subglohular or subpatelliform ; operculum 

 calrareous, the internal surface furnished with projecting apo- 

 phvses, the internal margin being thus articulated to the coluinellar 

 septum. 



Distribution. Temperate and Tropical Regions of the "World. 



Genus THEODOXIS [Neritina']. 



Theodoxis, de Montfort, Conch. Syst. ii, 1810, p. 350. 

 JVeritina, Lamarck, 1822 [Neritine, 1809]. 



TYPE, T. lutetianus, de Montfort (fluviatilis, Linn.) ; Europe. 



Range. Temperate and Tropical Regions of the World. 



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

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

 crenulated, rarely simple. 



9. Theodoxis perotetiana (Reduz). 



Neritina perotetiana, Recluz, Rev.Zool. Cuv. 1841, p. 333; Sowerby, 

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

 sp. 124 ; H. & T., C. I. pi. 157, figs. 2, 3. 



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

 tenuissime striata ; anfractibus tribus : nltimo superne coarctato ; 

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

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

 obsoleteque crenato. 



Alt. 9, diam. 11 mm. 



Hab. Streams of the Nilgherries. 



T. ceylonensis (Recluz), J. Conch. 1851, p. 202, appears to be a 

 variety having an orange edge to the otherwise black operculum. 



10. Theodoxis fuliginosa (Theobald). 



Neritina fuliginosa (Theobald), 3. A. S. B. xxvii, 1859, p. 315. 

 Neritina reticularis, var. capillulata, Sow. Thes. Conch, ii, pi. 156, 

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



Original description : Testa neritinaeformi, subglobosa, spira 



