38 THE POLYPLACOPH-^RA OF TASMANIA, 



25. CKYPTOPLAX STlilATUS (LAMK), 

 VAR. GUNNII. 



Chitonellus gunnii, Reeve: Conch. Icon., sp. 5. 



Cryptoplax striatus, vai-. gunnii, Pilsbry : Man. Conch. 

 Ser. I., Vol. XV., p. 54. 



This vermiform shell occurs commonly on the East and 

 North-West Coasts. The first two valves are wider and 

 more rounded than the others. These are narrower than 

 the valves of C. striatus. The valves are long and nar- 

 row, and are embedded in the girdle, which is five or 

 six times as large as the valves. The dorsal area is 

 smooth, narrow, homy, and is sometimes smaller towards 

 the middle than at each end. The ridges in the latero- 

 pleural area may be regular or irregular, sometimes (in 

 young specimens) beautifully pustulose. The girdle is 

 generally covered with seal-like hair. Some are leathery 

 or smooth. These are probably worn specimens. Length 

 of dried specimen, 45, breadth 9 m.m. 



26. CHITON JUGOSUS, Gould. 



Chiton Jugosus, Gould : Proc. Boston Soc. Nat. Hist II. 

 (1846), p. 142. 



Chiton concentricus, Reeve : Conch. Icon. (1847), sp. 95. 



Specimens of this very beautiful true chiton have been 

 found at Ulverstone, Bumie and Stanley, on the North- 

 West Coast, and at Frederick Henry Bay, and the estuary 

 of the Derwent, on the South Coast. It loves the 

 smooth rocks in deep water, about 3 feet below low tide. 

 The colour markings of the Tasmanian s-pecies are more 

 like the South Australian specimens than those of New 

 South Wales. In the Records of the Australian Mus- 

 eum, Vol. VII., No. 4, 1909, Hedley and Hull give an 

 interesting comparison between jugosus, torrianus and coxi. 

 Measurement : Length 49, breadth 24 m.m. 



27. CHITON PELLIS-SERPENTIS. Q. et G. 



Chiton pellis-serpentis, Q. and G., Vov. Astrolabe, III., 



1835, p. 381, Pilsbry: Man. Conch., Ser. I., Vol. XIV., 

 p. 173 



