146 
Many scores of specimens are in my cabinet from both 
Gulf St. Vincent and Spencer Gulf, also from Hopetoun and 
Albany, in Western Australia. I have dried specimens 
46 mm. long and 22 mm. broad. 
14. Ischnochiton variegatus, Adams and Angas, 1864. 477? 
Lepidopleurus variegatus, H. Adams and Angas, Proc. Zool. AY 
Soc., 1864, p. 192; Pilsbry, Man. Conch., ser. i., vol. xv., p. 102. 4°72 — 
Ischnochiton variegatus, Bednall, Proc. Mal. Soc., London, 4 43 | 
vol, ii., part 4, April, 1897, p. 146. , 
This species is found in Spencer and St. Vincent gulfs. 
It will probably be classed under J. crispus, which it closely 
resembles. Pilsbry has no plates of this variety in his 
Manual, and the description given would equally apply to 
I. crispus. Bednall says it attains a length of two-thirds of 
an inch. I have a number of specimens from the coasts of 
Yorke Peninsula, Port MacDonnell, Cape Jaffa, and Marino. 
It is probably a cream-coloured variety of crispus. 
cacleLd 
15. nen Quoy and Gaimard, 1834. laa 
Ohiton sulcatus, Quoy and Gaimard, Voy. ‘‘Astrolabe,’’ Zool., 
1834, vol. ifi§_p. 385. 
CG. decussatus, Reeve, Conch. Icon., 1847, pl. xviii., fig. 107. 
CG. castus, eve, op. cit., pl. xxii., fig. 146. 
Lepidopleurud,speciosus, Adams and Angas, P.Z.S., 1864, 
p. 192; 1865, p. 3. 
Gymnoplax urvi 
1880-1, p. 121. 
Ischnochiton sulcat Quoy and Gaimard: Pilsbry, Man. 
Conch., 1893, ser. i., vol. Xiv., p. 188; Iredale, Proc. Mal. Soc., 
London, vol. ix., part 2, June, 1910, p. 91. 
T. decussatus, Reeve: Bednall, Proc. Mal. Soc., London, 
1897, vol. ii., p. 146. 
The most beautiful of the South Australian IJschno- 
chitons may be easily distinguished by being broader in pro- 
portion to its length than the majority of Zschnochitons. It 
favours the edges of rocks, and is often found on top of stones 
and on the razor-like bivalve, Pinna inermis. The colours 
are very various—blue-green, rich brown, cream with brown 
dorsal areas, ochreous-yellow with splashes of purple, straw- 
colour with dark-brown splashes, brown and green with cream- 
white dorsal areas, and uniformly cream. I have dried speci- 
men, 46 mm. long and 27 mm. broad. Juveniles may be 
easily distinguished by the regular pustules in the anterior 
and posterior valves and the lateral areas of the median 
valves. ‘They are common in Spencer and St. Vincent gulfs, 
Streaky Bay, and West Coast. 






Rochebrune, Bull. Soc. Philom., Paris, 
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