73 PALUDESTRIXIDjE. 



Original description: Testa parva, subglobosa, rimata, longi- 

 tudiaaliter nodoso-costata ; apertura late ovata, superrie et ad 

 basin effusa : peristomate continue, incrassato, duplicate. 



156. Bithynia (? Fossarulus) costigera, Kiister. 



Bithynia (? Fossarulus) costigera, Kiister, Conch.-Cab., Paktdina, 



p. 33, pi. 7, figs. 18, 19. 

 Valmta sulcata, Eyd. & Soul., Voy. ' Bonite,' Zool. p. 517, pi. 31, 



figs. 19-21 ; H. & T., C. I. pi. 151, fig. 10. 



Original description : Testa perforato-rimata, ovato-conica, 

 turrita, solidula, pallide flava ; spira acuta ; anf ractibus 6 con- 

 vexis, subtilifcer concentrice lineatis, longitudinaliter striatis, 

 superne planulatis ; superioribus lineis tribus, ultimo numerosis 

 lineis elevatis, transversis obsitis ; apertura subrotunda, peristo- 

 mate recto, margine angulato. 



Alt. 7*5, diam. 5-5 mm. 



Hob. Bengal. 



Var. curta, Nevill, Hand List, pt. 2, p. 42. 



A short form, apparently constant, with the spire less produced 

 or exserted. 



Alt. 6-5, diam. 5-5 mm. 

 Hab. Bangalore. 



Subgenus HYDROBIOIDES. 



Hydrobioides, Nevill, Hand List, 1884, pt. 2, p. 42. 



TYPE, Biihynia*! turrita, Blanford ; Burma. 



Range. India ; Burma. 



Shell solid, turrite, rimatc ; aperture ovate ; the margins of the 

 peristome united by a parietal callus. 



157. ? Bithynia (Hydrobioides) turrita (Blanford). 



? Bithynia (Hydrobioides} turrita (Blanford), P. Z. S. 1869, p. 446 



(as Fairbankia (an Bithynia)). 

 Bithynia turrita, 'Nevill, in J. Anderson's Anat. & Zool. Researches 



during Yunnan Exp., Calcutta, 1878 [1879], p. 890, pi. 80, 



tigs. 4, 4 a. 



Original description: Testa subperforata, turrita, solidula, 

 fulva, glabra, nitidula. Spira elongato-comca, sutura impressa. 

 Anfr. 7, convex!, ultimus antice subascendens, subtus rotundatus. 

 Apertura ovata, postice vix angulata, varice externa mediocri 

 instructa ; peristoma undique expansiusculum, marginibus callo 

 junctis, externo leviter arcuato, columellari obliquo, antice cum 

 basali subangulatim juncto. Operc. ? 



