'90 ON THE CLASSIFICATOEY POSITION AND SYNONYMS, ETC. 



wrong, more especially as the sliells of the two species, 

 Eatoniella rufilahris and Potamopyrgus hadia, have mucli 

 resemblance to each other ; however, it must be admitted that 

 Hutton has not shown that Amnicola hadia (Gould) is a 

 Pofamopyrgus, though he has for M. corolla, which he regards 

 as the same species. 



Eatoniella is known by three species, inhabiting Kerguelea 

 Island, one New Zealand, and one Australia. 



The hahitats of the last are as follow : — Usually on sub- 

 merged weeds, or sheltering under stones at the margin in 

 water-courses subject to tidal influences, though occasionally 

 in fresh water, but rarely in waters wholly saline. It is a 

 characteristic estuarine shell, but is present in some inland 

 brackish waters ; is abundant throughout Southern Australia 

 and Tasmania, and extends to the Clarence Eiver in NeW 

 South Wales. 



The following references supply the chronological history 

 of the species :-^ 



FAMILY EISSOINlNiE. 



Genus Eatoniella. 

 Eatonia, E. A. Smith, 1875 (iiow Hall, 1857). 

 'Eatoniella, Dall, 1876 (nom. mut.). 

 Tatea, Tenison- Woods, 1879. 

 Bardania, Hutton, 1882. 



Eatoniella Eupilabeis. 



1863. — Diala rufilabns, A. Adams, Ann. Mag. Nat. Hist., 



p. 298. 

 1865. — Diala rufilahris, Angas, Proc. Zool. Soc, p. 174 



l875.—Hydrohia rufilahris, E. A. Smith, P.Z.S., p. 538. 



1876. — Byfhinia huonensis, Tenison- Woods, Eoy. Soc. 

 Tasmania for 1875, p. 77. 



1878. — Bythinia liuone7isis, Tenison- Woods, Eoy. Soc. 

 Victoria, vol. xiv., p. 62. 



1879. — Bitliynia huonensis, Petterd, Journ. Conch., vol. ii., 

 p. 93. 



1879. — Bithynella huonensis, E. M. Johnston, Eoy. Soc 

 Tasmania for 1878, p. 28. 



