162 



49. Acanthochites (Notoplax) wilsoni, Sykes, 1896. 



Acanthochites (Notoplax) wilsoni, Sykes, Proc. Mai. Soc, 

 London, vol. ii., part 2, July, 1896, p. 92, pi. vi., figs. 2, 2a. 



A. verconis, Torr and Ashby, Trans. Roy. Soc, S.A., 1898, 

 p. 217, pi. vi., figs. 4a-/. 



I have to thank Mr. Hedley for drawing my attention 

 to the similarity between .4. wilsoni and A. verconis. I have 

 gone through a number of specimens. There is a great differ- 

 ence between the small and large specimens in colour- 

 markings, the smaller being pearly-white mottled with rose- 

 pink and seemingly more carinated, while the larger speci- 

 mens are reddish to a deep maroon tint. 



Taken in dredgings in St. Vincent and Spencer gulfs 

 by Dr. Verco, by Mr. Ashby at Aldinga, Mr. Kerrison at 

 Cape Jaffa, by Mr. Basset Hull on Long Reef (New South 

 Wales), and by the writer at Robe, Marino, Kingscote, and 

 Minlacowie. 



Sykes' description is ably assisted by Mr. Hedley's draw- 

 ings in Torr and Ashby 's paper, loc. cit. 



50. Acanthochites maughani, Torr and Ashby, 1898. 



Acanthochites maughani, Torr and Ashby, Trans. Roy. Soc, 

 S.A., 1898, p. 218, pi. vii., figs. 5a-f ; Hedley and Hull, Records 

 Australian Museum, vol. vii., No. 4, 1909, p. 265. 



This species has been found only at Port Victor 

 (Maughan), Bottle and Glass Reef, and Freshwater Bay, 

 New South Wales (Hedley and Hull). I have a number of 

 New South Wales specimens in spirits. 



Acanthochites lachrymosus, May and Torr, just being 

 published (1912) by the Royal Society of Tasmania, is some- 

 what similar to A. maughani. The shell is much larger, 

 26x10 mm., but on comparing a co-type with the type of 

 maughani, though there is a striking resemblance in detail, 

 there are decided differences. 



51. Acanthochites exilis, Torr and Ashby, 1898. 



Acanthochites exilis, Torr and Ashby, Trans. Roy. Soc, S.A., 

 1898, p. 218, pi. vii., figs. 6a-/. 



Three specimens of this very diminutive chiton were 

 dredged by Dr. Verco in 15 fathoms in Spencer Gulf. It is 

 the smallest of all our South Australian Polyplacoyhora, and 

 may be easily distinguished by the bright-red dorsal area of 

 the third valve. One very handsome specimen, measuring 

 3x2 mm., was dredged by Dr. Verco in 15 fathoms off 

 Wallaroo. 



