83 



It is certainly deserving of subspecific rank. My material is 

 rather limited, so that it may on further examination and 

 comparison with a more extended series be found to deserve 

 full specific rank. Anterior valve. — The radial ribbing in 

 this valve is in straight lines, somewhat broken, giving a 

 shallow, nodulose appearance to these ribs, whereas the 

 sculpture of the dominant form (mawlei) is wavy. Median 

 valves. — The broken concentric ribbing of the lateral area 

 easily distinguishes it from typical mawlei. In this sub- 

 species the sculpture is very coarse. The concentric ribs are 

 better described as exceptionally coarse nodules, more or less 

 running into one another; this feature is especially marked 

 towards the posterior margin of this area. Posterior valve. — 

 The sculpture of this valve behind the mucro is much coarser 

 than is the case in the dominant form (mawlei). In other 

 respects the characteristics seem to accord. I am naming 

 it in honour of Mr. F. L. Saunders, who is an earnest South 

 Australian collector, and to whom belongs* the credit of 

 having first noticed the "host plant" of Stenochiton 

 cymodocealis, Ashby. 



Distribution of Australian Polyplacophora. 



Order POLYPLACOPHORA. 



Suborder LEPIDOPLEURINA. 



Family Lepidopleuridae, Pilsbry 



Genus Lepldopleurus. 



Subgen. Terenochiton, Iredale. 



liratus, Ad. and Ang., 1864 



matthewsianus, Bednall, 1906 

 badius, Hedley and Hull, 1906 ... 

 norfolcensis, Hedley and Hull, 1912 

 catenatus, Hedley and Hull, 1912 

 columnar ius, Hedley and May, 1908 

 niger, Torr, 1911 



Subgen. Choriplax. 



grayi, Ad. and Ang 



Suborder CHITONINA. 

 Family Callochitonidae, Thiele 



Genus Callochiton. 



platessa, Gould, 1846 



rufus, Ashby, 1900 



mayi, Torr, 1912 



elongatus, May, 1918 



Genus Eudoxochiton. 



Subgen. Eudoxoplax, Iredale and May 



inornatus, Ten. Woods 



Subgen. Chaetoplettra. 



biarmata, Rochebrune, 1882 ... 





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