101 
me from Eyre Patch, Western Australia, not far from the 
South Australian boundary. It is often found high and dry 
in crevices of rocks at and above high-water mark. It is 
remarkable that no specimens have been discovered in South 
Australian waters when it is so common in Western Aus- 
tralia. It occupies a similar position in Western Australia 
to that taken by Plaxiphora albida in South Australia. 
The figure in Pilsbry, vol. xiv., plate 53, figs. 36-40, 
shows the concentric marking and the beaks of the valves 
very distinctly. My specimens are nearly all much worn, 
and only a few valves retain the beak; the more perfect 
‘specimens show both the beak and rows of concentric polished 
pustules on the anterior valve, radiating from the apex. 
, pe 
Scciiles Ana 
25. OnrrHocurron quEnornus,” Gould, 1846. ESI4 
Chiton quercinus, Gould, Proc. Bost. Soc. Nat. Hist., 1846, 
vol. il., p. 142; U.S. Expl. Exped. Moll., p. 312, figs. 437, 487a; 
‘Otia, Conch., p. 3. 
C. (Onithochiton) quercinus, Gould, Otia, Conch., p. 242. 
C. Incti, Reeve, Conch. Icon., 1847, No. 94. 
Onithochiton rugulosus, Angas, P.Z.S., 1867, pp. 115, 223. 
O. Incii, Angas, P.Z.S., 1867, p. 223. 
0. Lyelli (non Sow.), Pilsbry, Man. Conch., vol. xiv., p. 247. 
O. quercinus, Gould; Pilsbry, Man. Conch., vol. xiv., p. 248. 
O. rugulosus, Angas; Pilsbry, Man. Conch., vol. xiv., p. 
249; Proc. Acad. Nat. Soc., Phil-, 1894, p. 88 
O. Incii, Reeve; Thiele, Zoologica Chim., Heft, lvi., p. 99. 
O. guercinus, Gould; Tredale, Proc. Mal. Soc., London. vol. 
adx., part 2, June, 1910. 
Specimens of this very beautiful chiton were taken at 
Esperance. Albany, Ellenbrook, and Rottnest Island. On 
the outlying reefs at Rottnest they could be seen crawling 
over the reefs very energetically. Gould’s type specimen was 
a small one—length, 22 mm.; breadth, 15 mm. T have a 
‘dried specimen, slightly curled, taken at Port Esperance—- 
length, 52 mm.; breadth, 23 mm. It is beautifully coloured. 
Those found on exposed rocks were covered with foreign 
matter. I have to thank Messrs. Hedley and Hull for the 
identification of this species. 
Unfortunately I have not had access to a description of 
Onithochiton Scholvieni, Thiele, Zool. Chun. 1909. Heft. 
Wvi., p. 99. Mr. Iredale says in the paper quoted that the 
specimens in the British Museum are labelled “West Aus- 
tralia.” He thinks that is correct. My specimens of O. 
quercinus vary considerably. It is possible that I may be 
able to place some of them with Scholvieni. 
