158 
P. glauca, Quoy and Gaimard: Bednall, Proc. Mal. Soc., 
London, vol. ii., part 4, April, 1897, p. 154; Pilsbry, Man. 
Conch., ser. i., vol. xiv., p. 825; Suter, Journ. Mal., 1905, vol. 
xii., part 4, p. 66. 
Plaxiphora costata, Blainville: Iredale, Proc. Mal. Soc., 
London, vol. ix., part 3, 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-Hast 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. TI have also collected it in Tasmania and in several 
places in Western Australia. Blainville’s description of this 
shell, in Pilsbry’s Manual, Joc. 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 striz 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 , Pilsbry. 
4 
41. Acanthochites asbesteides, Smith, 1884. AS /¢ 
Chiton (Acanthochiton) asbestoides, Carpenter, MS.: Smith, 
Zool. Coll. ‘‘Alert,” B. 83, pl. 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. Mal. Soc., London, 
vol. ii., part 4, April, 1897, p. 155. 
Pilsbry’s description of the Fam. Acanthochitide 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 haying tufts at the sutures, by the 
large fleshy girdle, and there being’ httle*or no distinction 
between the lateral and pleural areas. ~ f 
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 

