141 



Messrs. Maughan, Torr and Ashby, and Bednall and 

 Matthews have brought up the list to fifty-two species, and 

 this paper will raise the number to sixty-one identified 

 species. Some of the names have had to be changed owing 

 to Dr. Thiele and Mr. Tom Iredale's observations of the 

 original specimens of Blainville and others. 



My collection of chitons extends over practically the 

 whole of the South Australian coastline from Port MacDonnell 

 to Nuyt Archipelago in the Australian Bight. 



The South Australian Polyplacophora include the follow- 

 ing families : — Lepidopleuridce, Pilsbry ; Ischnochitonidce, 

 Pilsbry; Mopaliidce, Pilsbry; Acanthochitidce, Pilsbry; 

 Cryptoplacidce, Dall ; and Chitonidce, Pilsbry. 



The order of exposure of South Australian Polyplacop- 

 hora, mutatis mutandis, is P. albida, Blainville, on exposed 

 rocks at or near high-water mark, sometimes accompanied 

 by P. costata, Blainville, with P. matthewsi, Iredale, under 

 rocks in deeper water. 7. crispus is in abundance almost 

 everywhere a foot or two below high-water mark, sometimes 

 accompanied by 7. thomasi or 7. vergatus. The Acantho- 

 chites are found in sheltered pools on sandy weed - covered 

 rocks. In deeper pools 7. contractus, I. cariosus, I. ustulatus, 

 I. sulcatus, and other Ischnochitonidae are found, and deeper 

 still 7. smaragdinus, I. ptychius, Lorica volvax, Loricella 

 angasi, I. pilsbryi, and most of the true chitons, jugosus, 

 tricostalis, exoptandus, calliozona, and torrianus. On the 

 west side of St. Vincent Gulf I have found true chitons on 

 exposed rocks in shallow pools at low water. 7. tateanus, 

 C. verconis, A. verconis, and G. bednalli are, as a rule, 

 obtained only by dredging. 



Fam. LEPIDOPLEURIDCE, Pilsbry. 



1. Lepidopleurus inquinatus, Reeve, 1847. 



Chiton inquinatus, Reeve, Conch. Icon., sp. 154. 



Ischnochiton inquinatus, Reeve: Pilsbry, Man. Conch., ser. 

 i., vol. xiv., p. 90. 



Lepidopleurus liratus, H. Adams and Angas, Proc. Zool. Soc, 

 1864, p. 192; Angas, loc. cit., 1865, p. 187;' Pilsbry, Man. Conch., 

 ser. i., vol. xv., p. 101. 



L. inquinatus, Bednall, Proc. Mai. Soc, London, vol. ii., 

 part 4, April, 1897, p. 141; Sykes, Proc. Mai. Soc, London, vol. 

 ii., part 2, July, 1896, p. 86. 



Specimens of this diminutive chiton have been found all 

 along the coast of South Australia extending from Port 

 MacDonnell to St. Francis Island, Nuyt Archipelago. The 

 writer has specimens from Corney Point, Wool Bay, Marino, 



