71 



Geelong, named then by me, Bytliinia Victories. It will now 

 stand as Bythinella VidoricB. Its minute size, silky appear- 

 ance, fine longitudinal striae, and turbinately conical form, 

 distinguish it from all its Australian congeners. The list of 

 the genus for Tasmania will stand thus for the future : — 



Genus. 



Bythinella Moquin-Tandon, 1855. 



f The name Legrandi is pre-oecu- 



-r, 1 J , ■ ! pied by restoring Brazier's 



„ EXIGUA. =Paludestrina I ^^^^^^ ^^ Bythffda umcari^ 



legrandiana (Brazier). =Bythi-^ ^^^^^^ j^ (^ ^j^^ smallest Tas- 



nia legrandi nobis. | ^^^^^^-^^ ^ species-hence the 



(^ name exigua. 

 Bythinella simsoniana. =Bythi- ^ 



nia pontvillensis nobis. =Amni- > Brazier, 

 cola simsoniana ; 



Bythinella dulvertonensis. = ) 

 Bythinia dulv. nob. ) 



Bythinella legrandiana. ■^= Pa- } gj^^zier 

 ludestrina legrandiana. f 



= Bythinia unicarinata nobis. 

 Bythinella dlt^-robinensis. =By- ) 

 thinia dunrob. nob. ) 



Bythinella wisEMANiANA. =Palu- } -d„„ •„„ 

 T , • • . > jDiaziei. 



ciestrma wisemaniana. ) 



= Bythinia tasmanica nobis. 



It seems to me also not altogether improbable that this 

 may turn out to be Gould's Amnicola egena, of New Zealand, 

 or Hydrohia preissii (Phil.). 



Thus far the shells are all of one type, and may possibly 

 be varieties — a matter to which local naturalists are earnestly 

 invited to give their attention, as well as to the animal, about 

 which too little is known. The operculum is yellowish horny, 

 with certain dark, black, and oi^acjue spots, which I consi- 

 dered to be calcareous. There is another species to which I 

 have not referred, because it is of such a different type : — 



Bythinia huonensis, nobis. 



This shell. Professor Tate considers, should be made the 

 type of a new genus. The animal was carefully observed by 

 tiie Professor, who kindly placed his notes at my disposal. 

 The foot is broadly ovate, truncate under the head. The 

 muzzle is reddish brown, with a colorless lip. Tentacles 

 long, subulate, eyes enclosed with brown near ti^). Oper- 

 culum calcareous, with a vertical submarginal claw. This 

 peculiarity, combined with the turretted pyramidal form of 

 the shell, makes it the type of a new genus, which I have 



* This is, according to Mr. R. M. Johnston, only a variety of B. 

 vnsemaniana. 



