BY W. L. MAY AND W. G. TORR, LL. D., ETC. 31 



Coast, and in Frederick Henry Bay, where, however, 

 but few specimens have yet been taken. It may be re- 

 cognised by its peculiar colour markings, which vary great- 

 ly, some having black terminal valvos, and creamy white 

 central valves, the jnajority are black, brown or dark 

 green, splashed with creamy white. The thimble-like 

 appearance of the valves under a strong magnifying power 

 is easily seen, and the pearly girdle scales help to dis- 

 tinguish it. 



12. ISCHNOCHITON (HAPLOPLAX) MAYII. 



(Pilsbvy.) 



/ mayii, Pilsbrj, ' 'Nautilus," VIIL, p. 128, 1895. 



I. mayii, Hedlev and Hull, Rec. Aus. Mus., Vol. VII., 

 No. 4, 1909. 



This black rounded chiton seems almost peculiar to the 

 South Coast of Tasmania. Several examples have been 

 taken near Kelso, Tamar Heads. Some specimens of a 

 greenish hue, with black girdle, were found at Bruni 

 Island. The breadth is three-fourths of the length, and 

 this striking feature, with its uniform colour of jet black 

 or pPvle green, makes it easily distinguishable. It has not 

 been reported elsewhere in Australian waters. Habitat : 

 Frederick Henry Bay, Pirate Bay (type specimen), Nor- 

 folk Bay, and D'Entrecasteaux Channel, and Tamar Heads, 

 also plentiful at Maria Island. 



13. ISCHNOCHITON AUSTRALIS. (Sowerby.) 



/, atiafralis, Sowerby; Pilsbrj: Man. Conch., Ser. I., 

 Vol. XIV., p. 144, 



C. ausfralis, Sowerl>y; Lophyrus aiisf rail's, An gas; C. 

 evanidus, Sowerby ; C met alliens, Reeve. 



This shell occurs abundantly on the East Coast, at 

 Kelvedon, near Swansea, and at Maria Island, more spar- 

 ingly in Frederick Henry Bay. This species is dis- 

 tinguished from /. 7WVLe-hollandice bv the loneritudinal 

 riblets in the pleural area of /. australis. The separation 

 of these species emphasises the Bass-Isthmian of Mr. 

 Hedley, because /. novce-hollandice is found in abundance on 



