146 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Conchology, vol. xiv, p. 89), fully describe this species, although I 

 have not yet seen a South Australian specimen streaked with any 

 other colour than olive. Length 42, breadth 18 mm. 



Hah. — Encounter Bay ; St. Vincent's Gulf (Eapid Bay, "Willunga, 

 Marino) ; Troubridge Shoal ; east and west sides of Southern Yorke 

 Peninsula, under stones, low-water mark ; also Port Pairy, Victoria. 



Not included in Angas' Molluscan Pauna of South Australia, 

 Proc. Zool. Soc. 1865. 



11. ISCHNOCHITON VAEIEGATTIS (Ad. & Aug.). 



LejiidopJeurus variegatus, H. Adams & Angas: Proc. Zool. Soc. 1864,' 

 p. 192 ; Pilsbry, Man. Conch., ser. I, vol. xv, p. 102. 



A small species attaining a length of two-thirds of an inch. It is 

 oblong in form, and the coloration appears to be peculiar to it amongst 

 the South Australian Chitons. Some are cream-coloured, with just 

 a few dots of brown, especially along the dorsal ridge and the outer 

 edge ; others, again, are blotched with green and irregularly dotted 

 with brown, and a large proportion are blackish-brown throughout, 

 except for a j)ale longitudinal streak along the dorsal ridge, which is 

 almost always maculated with the prevailing colour. 



Not known to Mr. Pilsbry, who, however, on receipt of specimens 

 from me, wrote that he had no doubt of the identification. The 

 original description is, I think, sufficient to enable the student to 

 recognize this species, if in his possession, but probably it is not to be 

 found in many collections. 



Hah. — Plentiful at Sultana Bay, Yorke Peninsula; also at Hard- 

 wicke Bay, Spencer Gulf. 



12. IsCHNOCHITON DECUSSATUS (RcCVe). 



Chiion decussatm, Eeeve : Conch. Icon., sp. 107 ; Pilsbry, Man. Conch., 

 ser. I, vol. xiv, p. 93, as a synonym of /. contractus, Peeve. 



Chiton cafitus, Eeeve: Conch. Icon., sp. 145. 



Lepidopleurus speciosus, H. Adams & Angas: Proc. Zool. Soc. 1864, 

 p. 192. 



Shell oval, fiill-grown specimens measuring nearly two inches in 

 length by an inch in width. Colour greenish or yellowish white, 

 painted on, and in the vicinity of, the summits of the valves with 

 elongated triangular patches of brown, the apices pointing posteriorly. 

 Some specimens dark brown throughout. The end valves and lateral 

 areas are ornamented with concentric rows of closely-set but perfectly 

 distinct granules, irregular in size ; central valves carinate, finely 

 decussately striate on the summit, thence to the outer margin diver- 

 gently flexuously striated. Girdle brown, sometimes mottled with 

 white, covered with small closely imbricating scales. 



Hah. — Sultana Bay (fine specimens) ; Troubridge Shoal ; Port 

 Willunga, in St. Vincent's Gulf ; also Port Lincoln (Angas), and Hard- 

 wicke Bay, in Spencer Gulf. 



