BY W. L. MAY AND W. G. TORR, LL.1>., ETC. 33 



Specimens taken at Bumie and other places on the 

 North-Wcst Coast, Frederick Henry Bay, and all round 

 the South and East Coasts. This shell was common- 

 ly known as P. glauca, and is so named by W. T. Bednall, of 

 South Australia, and is distinct from P. alhida, formerly 

 known as P. petholata, by the latter liaving distinct corrugated 

 markings. 



17. PLAXIPHORA ALBIDA (Blainville). 



C. albidus, Blain., Diet., Sci. Nat.. 1825, Vol. XXXVI., 

 p. 547; Pilsbry, Man. Conch, 1893, Vol. XV., p. 105. 



C. glaticus, Q. and G., Voy. Astrolabe, Zoo)., 1834, 

 Vol. III., p. 376. 



C. peth olatus, Sow. 



Chaetopleura conspersa, Ad. and Ang. 



P. albtda, Blain. : Thiele, Zool. Chuu, 1909, Heft VI. p. 24. 



P. fasmanica, Blain.: Thiele, loc. cit., p. 25. 



P. bedyialli, Blain. : Thiele, loc. cit., p. 25. 



P. alhida, Blain., Tredaie : Proc. Mai. Soc, Loud., Vol. 

 IX., Part II., June, 1910, p. 98. 



We have had seme difficulty in satisfying ourselves that 

 Iredale is right in his conclusions with regard to P. 

 alhida and P. costata. The question we had to decide 

 was whether the South Australian glauca, which accord- 

 ing to W. T. Bednall, Proc. Mai. Soc, London. Vol, II., 

 Part 4, April, 1897, pp. 154-5, is not corrugated like P. 

 petholata, is /. costata. Iredale says, loc cit., p. 98: " South 

 Australian glauca were easily costatar If that is so, our 

 nomenclature is right. P. alhida is the one with zigzsig 

 corrugations in the pleural and lateral areas, and is found 

 well distributed on our coasts. 



18. PLAXIPHORA MATTHEWSI (Iredale.) 



Plaxiphora conspersa (Non. Ad. and Ang.), Bednall, Proc. 

 Mai. Soc, 1897, Vol II , p. 154. 



