BEDNALL : SOUTH AITSTEALIAN POLYPLACOPHOKA. 145 



8. IscHNOCHiTON CEispus (Rceve). 

 Chiton crispus, Reeve: Concli. Icon., sp. 120; Pilsbry, Man. Conch., 



ser. I, vol. siv, p. 89, pi. xxiv, figs. 98, 99. 

 Inchnochiton ITaddoni, Pilsbiy : Man. Conch., ser. I, vol. xiv, p. 88, 



pi. xxii, figs. 67-73. 



This species, until its description by Mr. Pilsbry in the Manual 

 of Conchology as /. Haddoni, was quoted by Mr. Angas in his List of 

 South Australian Shells, and accepted by Australian conchologists, 

 as Lepidopleurus longicymha, Blainville, and distributed by them as 

 such. In shape it is elongately oval, and decidetUy carinate on the 

 dorsal ridge — /. longicymla being rounded — with finely decussated, 

 striated central valves, concentrically granulate tenninal valves, and 

 longitudinally striated lateral areas : it attains to a length of about 

 an inch. This species is extremely variable in coloration, and the 

 remarks of Reeve with regard to /. longicymha are equally applicable 

 to it. He says : "It would be vain to attempt to describe the 

 variations which this species exhibits in colour and design of painting ; 

 in this respect it is of all Chitons the most variable, but the sculpture 

 is unifoiTu throughout." The most conspicuous form is black, with 

 a broad white dorsal band. 



Hah. — Encounter Bay, Rapid Bay, Port Willunga, Marino, Southern 

 Yorke Peninsula, and many other localities in South Australia ; Port 

 Pairy, Victoria ; New South Wales ; Tasmania. It appears to occur 

 generally along the southern coast of Australia from Port Jackson, 

 in New South Wales, to Port Lincoln, in South Australia, including 

 Tasmania, and to represent in Australia the New Zealand /. longicymha. 



9. IscHNOcniTON FRUTicosus (Gould). 



Chiton f rut ico-ins, Gould: Proc. Boston Soc. Nat. Hist., ii, p. 142; 

 Pilsbry, Man. Conch., ser. I, vol. xiv, p. 91, pi. xxiii, 

 figs. 78-80. 



A specimen of this Ischiochiton, which is common in New South 

 Wales, has very recently been obtained by Mr. E. H. Matthews 

 on Southern Yorke Peninsula. It is of the normal size. 



10. IscHNocHiTON coNTEACTus (Reove). 



Chiton contractus, Reeve: Conch. Icon., sp. 78; Pilsbry, Man. Conch., 

 ser. I, vol. xiv, p. 93, pi. xxiii, figs. 81, 82. 



Chiton pallidus, Reeve: Conch. Icon., sp. 92; Pilsbry, Man. Conch., 

 ser. I, vol. xiv, p. 89, pi. xxiii, fig. 91. 



The identification of this species has given me much trouble, 

 because I could not satisfactorily assign it to either the description 

 or figure of C. co7itractus in the Conch. Icon., while at the same time 

 I seemed constrained to look upon C. pallidus as the representative of 

 the shell. It is, however, accepted on the authority of Mr. Pilsbry, 

 Nautilus, vol. viii, 1895, p. 129, where also it is stated that "Mr. 

 Sykes considers pallidus, Rve., a synonym." Dr. Caipenter's notes 

 on the British Museum specimens, as given by Pilsbry (Manual of 



