144 



8. Ischnochiton (Heterozona) cariosus, Carpenter, MS. : 



Pilsbry, 1873. 



Heterozona cariosa, Carpenter, MS. : Pilsbry, Man. Conch., 

 ser. i., vol. xiv., p. 65; vol. xv., p. 82. 



Ischnochiton (Heterozona) cariosus, Pilsbry : Bednall, Proc. 

 Mai. Soc, London, vol. ii., part 4, April, 1897, p. 143; Sykes, 

 Proc. Mai. Soc, London, vol. ii., part 2, July, 1896, p. 87. 



This shell is widely distributed. It is abundant in Spen- 

 cer and St. Vincent Gulfs, and the writer has collected it 

 on St. Francis Island and all around the coast of Western 

 Australia as far as Fremantle. It is often covered with 

 Serpularia and has a carious appearance, hence its name. 



9. Ischnochiton pilsbryi, Bednall, 1896. 



Ischnochiton pilsbryi, Bednall, Proc. Mai. Soc, London, vol. 

 ii., part 4, April, 1897, p. 143. 



Found at Sultana Bay (Bednall) and at Hickey Point, 

 Y.P., and St. Francis Island by the writer. Most of the 

 specimens were found on rocks embedded in the sand. At 

 first sight it might be mistaken for crispus or cariosus, but 

 markings and girdle scales are very distinct, and all the 

 specimens are "uniform ochraceous-yellow." 



10 Ischnochiton ustulatus, Reeve, 1847. 



Chiton ustulatus, Peeve, Conch. Icon., sp. 102; Pilsbry, 

 Man. Conch., ser. i., vol. xiv., p. 96. 



Ischnochiton ustulatus, Carpenter, MS. : Bednall, Proc Mai. 

 Soc, London, vol. ii., part 4, April, 1897; Sykes, Proc. Mai. 

 Soc, London, vol. ii., part 2, July, 1896, p. 88. 



Lepidopleurus ustulatus, Angas, P.Z.S., 1867, p. 222. 

 When alive this shell is very brilliant, almost crimson ; 

 but it loses its colour in formalin, methylated spirits, or when 

 dry, and retains its singed appearance from which it derives 

 its name. The writer has traced it all around the coast from 

 Cape Jaffa to St. Francis Island. He also found it in Wes- 

 tern Australia. An abnormal specimen was found by Mr. 

 F. L. Saunders at Second Valley. It is much broader than 

 the -usual types; it measures 37x18 mm. 



This chiton easily changes its habitat. Scores of 

 specimens seen by Mr. Matthews on Yorke Peninsula one 

 week were not able to be discovered the week following. 



11. Ischnochiton crispus, Reeve, 1847. 



Chiton crispus, Reeve, Conch. Icon., sp. 120; Pilsbry, Man. 

 Conch., ser. i., vol. xiv., p. 89. 



Ischnochiton haddoni, Pilsbry, Man. Conch., ser. i., vol. xiv., 

 p. 88. 



