THE VIDTORIAN NATURALIST. 159 



been known to occur in South Australian waters, which has 

 usurped the Lamarckian title through an inexplicable blunder 

 of local naturalists. Thus, Angas in Proc. Zool. Soc, 

 1865, p. 165, says, "This species (that is, the South 

 Australian one) must not be confounded with the Tasmanian 

 species hitherto known also as V. undiilata, which has been lately 

 accorded specific rank by Mr. Sowerby under the name of 

 V. Angasi in the 'Thesaurus,' fig. 99, sp. 73;" and again, in 

 1867, loc. cit, p. 193, says, " The true V. undnlata^ Lamarck, is 

 from Port Lincoln." The Rev. J. E. Tenison-Woods, in " Proc. 

 Roy. Soc, Tasmania," 1877, says, "That this species Voluia 

 Angan, Sow., was long confounded with V. undulaia, which it 

 closely resembles." Petterd, in "Jour. Conchology," 1879, p. 342, 

 falls into the same error, recording V. undulata, Lamk., from 

 South Australian coast, and V. Angasi, Sow., from Tasmania, 

 Victoria, and New South Wales. Lastly, Tryon, in his " Manual 

 of Conchology," vol. iv., p. 92, suppresses the name of V, Angasi, 

 but as the figure to which he applies that name represents V. 

 undulata, it seems to me probable that he had not the two species 

 before him. 



It is pretty clear that the Voluia undulata of Lamarck, and of 

 Quoy and Gaimard, has had the name of V. Ajigasi giwen to it 

 by Angas, Woods, Petterd, and others, and that they have given 

 Lamarck's name to the South Australian shell. The rectification 

 of this blunder involves a new designation for the South Australian 

 volute. The synonyms of the two will stand thus : — 



1. VoLUTA UNDULATA. Lamarck, id Quoy, and Gaimard. 



V. Angasi. Sowerby and others. 



Hab., coasts of Bass Straits, Port Jackson, and Port 

 Stephens. 



2. VoLUTA Angasi, spec. nov. 



V. undulata. Angas and others (non Lamarck). 



Hab. Port Lincoln and Encounter Bay, South Australia. 



Whatever value we may attach to the differences between the 

 two shells, yet, for classificatory purposes, the differences are so 

 constant that it is not possible to make confusion : — Firstly, in 

 respect of shape, V. undulata has a shorter spire, smaller pullus, 

 and the last whorl is somewhat protuberant round the posterior 

 part, in consequence of which there is a slight concavely-depressed 

 area in front of the suture. The lip of the adult of V. Angasi is 

 slightly ascending posteriorly, and the post-angulation of the 

 aperture is not so pronounced as in V. undulata. Secondly, in 

 respect of colouration ; here the differences are very conspicuous. 

 The reddish-coloured transverse lines in V. undulata are sharply 

 and deeply plicate ; whereas, in V. Angasi, the undulations are 

 little more than somewhat sharp insinuations. 



The three following species, occurring in Bass Straits, are 



