100 



and the roundly elliptical forms. The opinion expressed in 

 Trans. Roy. Soc. South Aust., 190G, vol. xxx., p. 207, as to tlie- 

 identity of these two species is confirmed. 



Genus Helcioniscus, Dall. 

 H. limbatus, Philippi. 



Futella iimbata, Philippi, Abbild. und Besch. Conch., vol. iii.,- 



E, 71, pi. iii., f. 2, 1849; Reeve, Conch. Icon., vol. viii., pi. xiii., 

 , 29, a, b, 1854; Angas, Proc. Zool. Soc. Lond., 1865, p. 185 j 

 Ten. Woods, Proc. Roy. Soc. Tasmania, 1877 for 1876, p. 48; also 

 1879 for 1878, p. 45; Pritchard & Gatlifif, Proc. Roy. Soc. Vict., 

 vol. XV. (new series), part 2, p. 192, 1903. 



Patella (Helcioniscus) Iimbata, Phil., Pilsbry, in Tryon's Man. 

 Conch., 1891, vol. xiii., p. 143, pi. Ixxi., f. 53 to 56, and pi. xvii.^ 

 f. 28, 29. 



Flah. — That of the type is given by Philippi as ''New 

 Holland" (Largilliert) ; Reeve records it from ''Signet Bay, 

 North Australia : Dring" ; Angas, "Port Lincoln, South Aus- 

 tralia" ; Ten. Woods, "Southport, Tasmania" ; Pritchard and 

 Gatliff, "Cape Otway, Victoria." It has been taken at the 

 Neptunes and Thistle Island, and in Spencer Gulf by Dr. 

 Torr ; on Yorke Peninsula by Mathews ; at Encounter Bay by 

 myself. I did not find it at Kingston, Robe, Beachport, or 

 MacDonnell Bay. 



I) if}). — The largest dimensions given by Ten. Woods are 

 71 mm. by 64 by 32 ; but one from Yorke Peninsula measures 

 77 by 64 by 33. 



Philippi, Reeve, Angas, Pilsbry, and Pritchard & Gat- 

 liff regard it as a good species : but Ten. Woods in 1878 wrote : 

 "I regard this shell as a variety, or not even a variety, of the 

 preceding fP. tramose?'icus. Martyn). The somewhat broader 

 ribs may distinguish it." Tate & May in their census of 

 the Marine Moll, of Tasmania, Proc. Linn. Soc. of New South 

 Wales, vol. xxvi., 1901, p. 141, accept this view. Among the 

 shells collected by Dr. Torr in Spencer Gulf is a facsimile of 

 Philippi's type figure, in shape, size, colour, and erosion. 

 Others, up to 55 mm. in length, have the apex perfect. In- 

 stead of being yellowish they may be of a deep salmon tint, 

 and instead of 32 may have only 22 ribs, much broader than 

 in the type, and thus differ still more than this from P. fra- 

 moserira, Mart. On the other hand, a unicoloured salmon-tint- 

 ed shell from Beard Peninsula, West Coast of South Austra- 

 lia, in its ribbing comes between both species ; and a small shell 

 from Encounter Bay in its shape and flat rounded ribs ap- 

 proaclies //. litnhdius, and yet in its 44 ribs and red, yellow, 

 and black radial markings is allied to H. tr am o serious. I 

 lean to the view of identity with extreme variation ; but my 

 series is not very large, and does not furnish such gradations 

 as to warrant an absolute conclusion. 



