PALUDESTRINID^E. 67 



Family PALUDESTRINID^ [=HytooNUU]. 



Subfamily PALUDESTRININ.E. 



Shell small, corneous, fusiform, narrowly rimate or imperforate. 

 Distribution. World-wide. 



Genus PALUDESTRINA. 



Hydrobia, Hartmann, 1821, nee Leach in Ooleoptera, 1817. 

 Paludestrina, d'Orbigny, Voy. Amer. Merid., Moll. 1840, p. 381. 



TYPE, P. auberiana, d'Orb. ; S. America. 



Itange. World- wide. 



Animals having no eyes on the tentacles, these being placed 

 outwardly at their base ; operculum horny, spiral, resembling 

 Littorina. An inhabitant of both fresh and brackish water. 



Subgenus BELGRANDIA. 



Belgrandia, Bourgtiignat, Cat. Moll. Ter. Fluv. Env. Paris, 1869, 

 p. 15. 



TYPE, Bithinella gibba, Drapernaud ; France. 



Range. Europe; Asia. 



Shell having one or two rounded swellings on the last whorl, 

 these, as the author explains at some length, being quite different 

 from those caused by rest periods. 



135. Paludestrina (Belgrandia) miliacea, Nevill. 



Paludestrina (Belgrandia} miliacea, Nevill, J. A. S. B. xlix, pt, 2, 

 p. 161; op. cit., 1, p. 158, pi. vii, fig. 7; Nevill, Hand List, 

 pt. 2, p. 52 [as Hydrobia (Bythinella)]. 



Original description: Testa minuta, vix rimata, conico- 

 elongatula, solida, parum nitida, albido-viridula, laevigata ; spira 

 paululum producta, apice minuto, acutiusculo ; anfr. 5, con- 

 vexiusculi, ultimis duobus rapide accrescentibus, ultimo basi 

 subplanulato, ad aperturam gibbositate crassa circumscripto ; 

 apertura ovato-rotundata, iutus incrassata, peristoma continuum, 

 valide incrassatum, raargine externo arcuato, basi sinuato, mar- 

 gine columellari subangulatiin contorto, subrefiexo. Operculuui 

 sat prot'imde immersum, tenue, pellucidum, vitreum. 



Alt. about 2-75, diam. 1-75 mm. 



Hab. Port Canning (Nevill, Mainwaring). 



Type in Indian Museum, Calcutta. 



Subvar. gibbosula. 



Hab. Port Canning (Stoliczka), 



