IKEDALE : NOTES ON POLYPLACOPHOKA . 125 



(p. Ill) Nierstrasz catalogued PlaciphoreUa peiasa, lleeve, as being 

 on record, from the locality, with the remark "PlaciphoreUa peiasa, 

 Reeve, von Stroomen Kap, N. W. Celebes stellt ebenso eine isolierte 

 Form dar". The recognition of Chitofi petasus, Reeve, as referable 

 to Craspedochiton, and not to PlaciphoreUa, removes one of the few 

 apparent geographical anomalies present when tlie distribution of the 

 Polyplacophora is studied. 



In this place I might point out that Nierstrasz (p. 23) introduced 

 a new species of Ischnochiton with the species-name variegatus. 

 I cannot see that amendment has yet been made, though one of the 

 commonest Australian Ischnochitons bears that species-name, and has 

 the prior right. Reverting to geographical anomalies, I would cite 

 a paper by Merstrasz in the Tijdschr. der Nederl. Dierk. Vereen, 

 ser. II, vol. X. In that paper Nierstrasz, through the acceptance of 

 inaccurate Museum records, has perpetuated some incorrect generic 

 determinations, and introduced others. These will mostly be dealt 

 with in their places, but the admission of Cryptoplax to the 

 Neozelauic Fauna, the reference to Mangeria of specimens from the 

 Straits of Magellan and the Cape of Good Hope, as also Tonicia from 

 New Zealand, will be refused without the slightest hesitation until 

 perfectly authenticated examples are procured. 



Kierstrasz also referred to Heterozona the species Hedley described 

 (Proc. Linn. Soc. N.S.W., vol. xxiii, p. 100, 1898) under the name 

 Ischnochiton araucarianus. 



Thiele (Revision, p. 96) suggested the reference of this species to 

 Sclerochiton. Judging from figures I agreed, and it seemed difficult 

 to separate this from Chiton (^Sclerochiton) tniles, Pilsbry, described 

 from Torres Straits. With his usual generosity, Mr. Hedley 

 forwarded me paratypes of his species, and without doubt it is 

 very close to S. miles. I have received a fair collection of Chitons 

 made by my friend Mr. Robin Kemp at Cape York, Torres Straits, 

 and therein was included many specimens of S. curtisiamis (Smith), 

 proving that that species extends from Port Curtis northwards to 

 Cape York, thus apparently confirming my subjection of Thiele's 

 S. aruensis (Proc. Jdalac. Soc, vol. ix, p. 103, 1910). Nothing like 

 Pilsbry's S. miles has yet been seen from Torres Straits, so that 

 it is quite possible the locality is erroneous, and that the shell 

 may have come from New Caledonia. I hope to revert to this 

 matter again soon. 



Two other incorrect determinations may be here rectified. In the 

 Report on the Polyplacophora of Ceylon (Ceylon Pearl Oyster Fisheries 

 Suppl. Reports, p. 178, 1903) Sykes recorded CallochiUm platessa, 

 Gould ? This would seem to be confirmed by the admission by Smith 

 into the Fauna of the Maldives and Laccadives, p. 619, of the same 

 species, C. platessa. 



This species is fairly familiar to me, as I have collected it both in 

 New Zealand and Australia, and though both Smith's and Sykes' 

 shells, which I have examined, are undoubtedly referable to the genus 

 Callochiton [sensu lato), tliey are just as certainty not specifically 

 identical with Gould's C. platessa. 



