151 
Very often found covered with calcareous matter. I 
huve traced it from Port MacDonnell through both gulfs to 
St. Francis Island. Some beautiful dark-brown specimens 
came from Mr. Anderson, of Second Valley, and rich red 
(iyon-stained ?) ones from Cape Jafia. Its sculpture and 
rounded appearance easily differentiates it from other chitons. 
It, is our only South Australian Callistochiton. “This genus 
differs from Zschnochiton in the peculiar insertion-teeth, 
Which are curved into ribs as if festooned, in the relation of 
the slits to the external ribs, and in the tail valve, which is 
Otten peculiarly humped” (Pilsbry, Man. Conch., ser. i., vol. 
Xiv., p. 260). This chiton has a very wide range, and has 
been collected by the author in places as far apart as Queens- 
land and Western Australia. 
fam. CHITONIDIA, Pilsbry. 
25. Onithechiton ashbyi, Bednall and Matthews, 1906. 
Onithochiton ashbyi, Bednall and Matthews, Proc. Mal. Soc., 
London, vol. vii., part 2, June, 1906, p. 92. 
As far as I] am aware, only one specimen of this chiton 
has been discovered. It was found by Mr. Ashby at Aldinga, 
ayd to him I am indebted for the specimen. It is our only 
Onithochiton, and the eyes are of a pearly appearance set in 
its cream-coloured valves. The smooth warty appearance will 
easily distinguish this shell. 
i - 
AnpiwoeChiton tricostalis, Pilsbry, 1894. 
Chiton (canaliculatus, var. ?) tricostalis, Pilsbry: Nautilus, 
Vol. viii., 1894, p. 54. 
GQ. tricostalis, Pilsbry: Bednall, Proc. Mal. Soc., London, 
vol. ii., part 4, April, 1897. 
This “handsomely sculptured shell” assumes an endless 
variety of colour. I have specimens, red and green, pink and 
black, green and white, creamy, cream with black spots, 
yellow with black spots, etc. The second valve is often of a 
distinctive colour. It is bzcostalis in small specimens, the 
middle rib in the lateral areas begins when about half-grown. 
Some valves have four ribs. I have specimens from Capes 
Jaffa and Jervis, several places in Gulf St. Vincent, Southern 
Yorke Peninsula, and St. Francis Island. I have collected 
it in Western Australia, and have specimens from New South 
Wales. 
Ave2wechiton calliozon¥? Pilsbry, 1894, 
Chiton (Afreus, var.) calliozona, Pilsbry: Nautilus, vol. viii., 
1894, p. 565. 
C0. calliozona, Pilsbry: iden Proc. Mal. Soc., London., 
vol. ii., part 4, April, 1897, p. 151. 
FETS 
F564 
Fst) 
