257 



Descriptions of Nkmvt Species of Australian 

 MoLLUSGA, Recent and Fossil. 



By Professor Ralph Tate, F.L.S., F.G.S. 



[Read September 8, 1891.] 

 Plate XI. 



Genus Siphonalia. 



It is generally admitted that Siphonalia dilatata, Quoy and 

 Gaimard, and aS'. Tasmaniensis, Adams and Angas, are two 

 sufficiently distinct species ; with respect to a third species, 

 S. maxima, Try on, in Manual Conch., 1881, p. 135, t. 54, fig. 

 355, some doubt has been expressed as to its validity, and after 

 lengthened study of considerable material, having traced-up 

 specimens of S. Tasmaniensis from three-fourths of an inch in 

 length to those of seven inches, I have no hesitation in regarding 

 S. maxima as the senile stage of S. Tasmaniensis. 



The species inhabiting South Australian waters are : — 



Siphonalia dilatata ; Fums dUatatus, Quoy and Gaimard, Voy. 

 Astrolabe, t. 34, figs. 15-16. 



This is recorded from Encounter Bay by Angas, 1865, where 

 it is rare. 



Siphonalia Tasmaniensis, Adams and Angas (Fusus), Proc. Zool. 

 Soc, 1863, p. 421, t. 37, fig. 1. 



S. 7naxima, Tryon, op. cit. 



This has a much longer spire than the preceding, narrower 

 body-whorl, less sharply angulated, with more numerous and 

 obtuse tubercles on the keel. 



The species was first recorded by Angas from Hardwicke Bay, 

 where it is a common shell ; it also lives among stones at ex- 

 treme low- tides in Encounter Bay. 



Siphonalia pyPUlata, Reeve (Fusus), Icon. Conch., t. 13, figs. 50a-506 

 The type is from Tasmania, but it also occurs in Port Phillip 

 Bay, and, according to Angas, in Spencer-Gulf. 



Siphonalia sulcata, Lamarck, sp. 



Fusus sidcatus, Lamarck, An. s. Yert., vol. 7, p. 125, 1822. 



Siphonalia ( Austrofusus ) stdcata, Tryon, Man. Conch., 1881,. 

 p. 138, t. dQ, fig. 380. 



Fusus ustulatus, Reeve, Icon. Conch., t. 17, fig. 66; id.y 

 Tryon, loc, cit., p. 66, t. 39, fig. 170. 



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