ASHBY : NOTES ON THE GENUS STENOCHITON. 263 



Through some mishap the unique type of C. longicymba, Bl., 

 must have been mislaid, and Quoy and Gaimard must have been 

 shown Blainville's Chiton lineolatus as being longicymba. Had they 

 carefully reread Blainville's original description they would at once 

 have recognized the error. 



I have often been asked how it was possible for Quoy and Gaimard 

 to have made such a mistake ? I think the evidence adduced 

 above is conclusive, a reference to their description demonstrates at 

 once that it was Blainville's C lineolatus that they thought was con- 

 specific with their New Zealand shell, and they marked one of their 

 varieties as a variety of that shdl ; probably the true longicymba 

 had come off its card and a shell of the other species had been wrong- 

 fully placed upon it. 



Blainville and Rochebrun both affirm that the type of Chiton 

 longicymba was collected by Peron and Lesueur at lie King. It was 

 probably a specimen washed up on the beach ; I have seen similar 

 ones come ashore in South Australia. Of course, until it is redis- 

 covered in King Island, the locality must be a little uncertain, for 

 I myself saw in the Museum in Paris specimens of Chiton hirtosus, 

 Peron, = Liolophura georgiana, Q. and G., and Acanthopleura 

 gemmata, Blain., both under the name of Chiton hirtosus, Peron, 

 and both stated in Peron's handwriting as having come from " lie 

 King ", whereas they had most certainly been collected later on 

 in Western Australia. 



Stenochiton FALLENS, Ashby, 1900. 



(Trans. Roy. Soc. of S. Austr., vol. xxiv, 1900, p. 86, Ashby ; loc. 



cit., vol. xlii, 1918, pp. 75, 76, pi. xiv, fig. 14a, b) = S. juloides, 



Ad. and Aug., of Sykes (Proc. Malac. Soc, vol. ii, pt. 2, July, 



1896, p. 86), Gatliff and Gabriel (Proc. Roy. Soc. of Vict., 



vol. XXX, pt. 1), Ashby (Proc. Roy. Soc. of Vict., xxxiii, N. Ser., 



1921). 



The few known specimens of this very distinct Stenochiton have all 



with one exception been dredged by Sir Joseph Verco in South 



Australia ; the exception is in the Bracebridge Wilson Collection, 



dredged in Victoria, and wrongfully referred to the previous species 



by Sykes. 



The general coloration is cream, and while we cannot affirm for 

 certain that they live on " Sea-Grasses ", there is ample justification 

 for our assuming that they do so. 



A protective coloration is common to all the other known 

 members of this genus, and we may assume that this species lives 

 on old or dying leaves of " Sea-Grasses ", or that it belongs to such 

 depths that the usual green colour of these plants is much modified. 

 The great breadth in proportion to the longitudinal length of the 

 anterior valve easily distinguishes this species from its congeners. 



