lO PALrDESTRIXin^, 



Orir/inal descr!2'>iion : — Testa parva, subglobosa, rimata, longi- 

 tiidiiialiter nodoso-costata ; apertura late ovata, supenie et ad 

 basin effusa : peristomate continuo, incrassato, duplicato. 



156. Bithynia (? Fossariilus) costigera, K'dster. 



Bithynia (? Fossandns) costit/eir/, Kiister, Concb.-Cab., Paludina, 



p.';i.3, pL7, fi^-.^. 18, la 

 Valvata sidccda, Eyd. & Soul., Vov. ' Boiiite,' Zool. p. ."ilT, pi. 31, 



figs. ld--n ; H. & T., C. I. pL lol, fig. 10. 



Original description : — Testa perforato-rimatn, ovato-coiiiea, 

 turrita, solidula, pallide flava ; spira acuta; aufractibiis 6 con- 

 vexis, siibtiliter conceutrice lineatis, lougit-udinaliter striatis. 

 siipenie planulatis ; superioribus lineis tribiis, ultimo numerosis 

 lineis elevatis, transversis obsitis ; apei'tui'a subrotuada, peristo- 

 mate recto, niargine angulato. 



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



Jfab. Bengal. 



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



A sliort form, apparently constant, w itli tbe spire less produced 

 or exserted. 



Alt, 6*5, diam, 5*5 mm, 

 JIab. Banjialore, 



Subgenus HYDROBIOIDES. 



Jdi/drobiuides, Nevill, Hand List, 1884, pt. 2. p. -i-J. 



TvPE, Bith)/nia'? iurrita, Blanford ; Burma, 



Bauge. India ; Burma, 



Shell solid, turrite, riinate ; aperture ovate; the margins ol' the 

 peristome united by a parietal callus, 



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



? Bithynia (Hydrobioides) turrita (Blanford), P. Z. S. 18G9, p. 446 



(as Fidrbanlxia (an Bithynia)). 

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



diiring Yunnan Exp., Calcutta, ls78 [1879], p. 890, pi. 80, 



tigs. 4, 4 a. 



Original descri^'ttion : — Testa subperforata, turrita, solidula, 

 fulva, glabra, nitidula. Spira elongate- conica, sutura impressa. 

 Anfr, 7, convexi, ultimus aniice subascendens, subtus rotundatus. 

 Apertura ovata, postice vix angulata, varice externa mediocri 

 instructa ; peristoma undique expansiusculum, marginibus callo 

 junetis, externo leviter arcuato, columellain obliquo, antice cum 

 basali subangulatim junctu. Operc. — ? 



