284 STUDIES ON AUSTRALIAN MOLLUSCA, xi., 



In the British Museum are a series of this and of the following 

 species, which are probably the types or cotypes. There are in 

 Australia few copies of the work in which it is described, and per- 

 haps none in Tasmania. So I present drawings of the London 

 specimens. These Tasmanian species have not been recognised 

 locally, and have probably been redescribed. Perhaps L. gunnii is 

 Potamopyrgus woodsii Petterd. 



Littoridina diemensis Frauenfeld. 

 (Plate xvii., fig. 52.) 

 Amnicola diemense Frauenfeld, Verhandl. Zool. Bot. Ges. Wien, 

 xv., 1865, p. 529, PI. x. (2 figs.) ; Id., Petterd, Proc. Roy. Soc. Tas 

 mania, 1888 (1889), p. 81. 



This is also drawn from a specimen in the British Museum Pet- 

 terd suggests that Amnicola diemense will prove to be Beddomeia 

 launcestonensis Johnston. 



Iravadia clathrata A. Adams. 

 (Plate xvii., fig.53.) 



Pyrgula clathrata A. Adams, Proc. Zool. Soc, 1853 (1855), p. 

 185. 



In the original description this hitherto unfigured species is cited 

 from "North-east Australia (Jukes)." But specimens in the Brit- 

 ish Museum, possibly types, but not so marked, are labelled "Bac- 

 layon, Philippines." Because of this casual and perhaps erroneous 

 reference to Australia I present a figure of the British Museum 

 example. And as Pyrgula, Christofori and Jan,* is usually in- 

 cluded in the Hydrobiidse I transfer the species to Iravadia. 



Obtortio Hedley. 



Finella A. Adams, Ann. Mag. Nat. Hist., (3) vi., 1860, p. 336; 

 err. type for Fenella A. Adams, Ann. Mag. Nat. Hist. (3) xiii., 

 1864, p. 39; Id., Crosse, Journ. de Conch, xvi., 1868, p. 46. Not 

 Fenella Westwood, Synopsis of Genera of British Insects, 1840, p. 

 54. 



Obtortio Hedley, Mem. Austr. Mus. iii., 1899, p. 412. 



♦Stimpson, Smithsonian Miscell. Coll., 201, 1865, p.47. 



