158 



F. glauca, Quoy and Gaimard : Bednall, Proc. Mai. Soc, 

 London, vol. ii., part 4, April, 1897, p. 154; Pilsbry, Man. 

 Conch., ser. i., vol. xiv., p. 325; Suter, Journ. Mai., 1905, vol. 

 xii., part 4, p. 66. 



Plaxiphora costata, Blainville: Iredale, Proc. Mai. Soc, 

 London, vol. ix., part 2, June, 1910, p. 97; Thiele, Zool. Chun., 

 1909, Heft lvi., p. 24. 



Mr. Gatliffe, of Victoria, identifies this shell with P. 

 bednalli, Thiele. 



I have specimens from Port MacDonnell, Robe, Middle- 

 ton, Bluff, Encounter Bay, Second Valley, Noarlunga, Wool 

 Bay, Troubridge, Hardwicke Bay, Spencer Gulf, and St. 

 Francis Island. Only an occasional specimen is found 

 on the South-East coast. Numbers were found at Port 

 Noarlunga by Mr. F. L. Saunders. It is more com- 

 mon in Spencer Gulf, and is abundant on St. Francis 

 Island. I have also collected it in Tasmania and in several 

 places in Western Australia. Blainville's description of this 

 shell, in Pilsbry 's Manual, loc. cit., is very unsatisfactory. 

 Quoy and Gaimard' s description of P. glauca does not corres- 

 pond with my specimens in every particular. I can find no 

 marginal striae in the anterior portions of the valves. The 

 whole of the shell in unworn specimens is covered with minute 

 microscopic granulations or reticulations. Some specimens 

 have beautiful parallel longitudinal lines of green and black 

 on the median valves. It has seven or eight riblets on the 

 anterior valves. 



Fam. ACANTHOCHITID^E, Pilsbry. 



41. Acanthochites asbestoides, Smith, 1884. 



Chiton ( Acantho chiton) asbestoides, Carpenter, MS. : Smith, 

 Zool. Coll. "Alert," p. 83, pi. vi., fig. 6; Pilsbry, Man. Conch., 

 ser. i., vol. xv., p. 17. 



Acanthochites asbestoides, Carpenter : Pilsbry, Proc. Acad. 

 Nat. Sci., Philad., 1894, p. 79; Bednall, Proc. Mai. Soc, London, 

 vol. ii., part 4, April, 1897, p. 155. 



Pilsbry's description of the Fam. Acanthochitidce is very 

 helpful. The South Australian species are constantly being 

 increased, and a splendid opportunity awaits a student who 

 will make this field a special study. The Acanthos. differ from 

 nearly all other chitons by having tufts at the sutures, by the 

 large fleshy girdle, and there being little or no distinction 

 between the lateral and pleural areas. 



The golden or silvery tufts of asbestoides, lying neatly 

 along the suture between the valves, easily distinguishes it 

 from other Acanthos. 



I have found it in numbers in a sheltered cave at high- 

 water mark on Kangaroo Island. I have specimens from 



