72 A REVISED CENSUS OF THE TASMANIAN FLUVIATILE MOLLUSCA, 



26. elongatus, Sp. Nov. Shell narrowly elongate, colour, 



dull brownish black on the spire, shining light brown 

 on the body whorl, finely axially striate, whorls 6i, 

 much rounded, suture well impressed. Aperture 

 roundly ovate, lip entire, backed by a distinct um- 

 * bilical chink. Long. 3, Lat. 1 mill. Hab. Apsley 

 River, near Bichcno, collected by E. Mawle. It is 

 with some diffidence that I add another member to 

 this over-described genus, but I cannot match the 

 species with any of the others. It comes nearest to 

 P. gunnii, but it is much longer, and narrower, with 

 very rounded whorls. The habitat is a small isolated 

 river on the middle East Coast. PI. XI., f. 21. 



27. marginata, Petterd, P. and P. Roy. Soc. Tas., 1888, 



p. 73, pi. 1, f. 9. Hab. Stream near Heazlewood 

 River. Very distinct from all our other species. PI. 

 XL, f. 22. 



28. nigra. Quoy and Gaim. Zool. Astrolabe, iii., 1835, 



p. 174, pi. 38, f. 9-12. Hab. D'Entrecasteaux Channel. 



= Ji. leyrandiana and wisemanniaiw,, Brazier, Proc. 

 Zool. Soc, 1871, p. 678. PL XL, f. 23. 



— B. petterdiana, Brazier, P.L.S. N.S.W., 1, 1875, p. 

 19. • • 



= legrandi, Ten. Woods, P. and P. Roy. Soc. Tas., 

 "1875, p. 76. PI. XL, f. 24. 



=unicarinata, Ten. Woods, op. cit. PI. XL, f. 25. 



= tasmanica, Ten. Woods, op. cit. p. 77. PI. XL, 



f. 26. 



= exigua, Ten. Woods, op. cit. for 1878, p. 71, op. 

 cit, 1879, p. 71-72. 



Petterd, op. cit. for 1888, p. 69-71. Widely distri- 

 buted in rivers and creeks, both North and 

 South. 



29. smitMi, Petterd, Proc. Roy. Soc. Tasm. for 1888, p. 



72, pi. 1, f. 10. Hab. Rivers of the North-West, 

 Heazlewood, Arthur, Waratah, and Castray Rivers. 

 Perhaps only a large form of P. dyeriana. PI. XL, 

 f. 27. 



30. tasmanica, von Martens, Hydrobia, Weig. Arch. Nat. 



Sci., 1, 1858, p. 185, pi. 5, i. 12 = A. diemense, Frauen- 

 feld, Verhandl. Zool. Bot. Ges. Wien, XV., 1865, p. 

 529, pi. X., 2 fis>'s. Hedley. P.L.S. N.S.W., xxxviii., 

 1913, p. 284, pi. 17, f. 52 = #. dulrerfonrusis, Ten. 

 Woods, P. and P. Roy. Soc. Tas., 1875, p. 77. PI. 



