BEDXALL : SOUTH AUSTRALIAN POLTPLACOPHORA. 141 



"With the exception of the doubtful species, authentic specimens of 

 all the foregoing have passed through my hands. It will be seen 

 that when Mr. Adcock's list was published in 1893 only twenty-two 

 species were credited to our waters, and amongst these all the doubtful 

 ones. In the short space of less than three years I have been enabled 

 to augment the list to thirty-seven known, and six doubtful species, in 

 fact to all but double the number, which it must be admitted is good 

 evidence of the richness of South Australia in Polyplacophora. 



1. Lepidopleurus mauiNATus (Reeve). 



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



Lepidopleurm lirutus, H. Adams & Angas : Proc. Zool. Soc. 1864, 

 p. 192; Pilsbry, Man. Conch., ser. I, vol. xv, p. 101. 



A small elongate species, ornamented dorsally with fine, longitudinal, 

 microscopically-closely-beaded riblets, which become coarser and 

 somewhat divergent on the side slopes ; and with the terminal and 

 lateral areas concentrically sulcate, the lateral areas especially so. 

 The colour is not constant, varying from dirty yellow to dark 

 brown. The South Australian examples which have been taken 

 do not exhibit the brown spots on the summits of the valves that 

 are present in New Zealand ones, and as shown in the figure given in 

 the Conch. Icon. Length 10, breadth 3 mm. 



Huh. — East and west sides of Southern Yorke Peninsula, South 

 Australia ; Port Phillip, Victoria ; Tasmania ; also New Zealand 

 (Suter, Nautilus, ix, p. 108). 



A small Chiton obtained amongst a great number of specimens 

 collected in company with Mr. E. H. Matthews in March, 1895, 

 was forwarded to Mr. Pilsbry, with another and larger unnamed 

 example that had been obtained from Hobson's Bay, Victoria. An 

 examination of the shell had shown me that it was a Lepidopleurns, 

 but I was not prepared for the discovery, by comparison with the 

 types, that it was conspecific with Reeve's C. inquinatus, since I had 

 concluded that a colour variety of Lepidopleurus \_IscIinochiton^ 

 variegattis, Ad. & Aug., would prove to be synonymous with that 

 species. 



2. Callochiton platessa (Gould). 



Chiton platessa, Gould: Proc. Boston Soc. Nat. Hist., vol. ii (1846), 

 p. 143; Pilsbry, Man. Conch., ser. I, vol. xiv, p. 49, 

 pi. X, figs. 1-5. 



A single specimen of this well-known New South "Wales species 

 was obtained at Port "Willunga, St. Vincent's Gulf, by Mr. W. 

 Kimber. The coloration of the South Australian specimen is ruddy 

 brown, with cloudy patches of white on the margins of the valves, 

 near the girdle ; the umbones of the fifth, sixth, and seventh valves 

 are bright orange-red, the same colour showing beneatli the brown 

 tint of the valves anterior to them, but not on the posterior valve : 

 on this there are a few white spots. 



