yo SUTER : REVISION OF THE NEW ZEALAND POLYPLACOPHORA. 



Chiton aepeus, Reeve. 



This species belongs to what I will call the canaliculatus group, having 

 a coarse sculpture and the central area with strong longitudinal ribs and 

 grooves. Also C. stawjai. Reeve and C. limans, Sykes, are to \)e in- 

 cluded in this group. C. aereus may at once be separated from the others 

 by the longitudinal furrows of the pleural tracts being rubl)ed off in the 

 middle, not unlike those in Callochiton empleiinis, where however they are 

 much shorter. 



In my specimens the surface of the valves is microscopically sha- 

 greened, the girdle has mostly a few radiate white bands on the sides, and 

 the scales are faintly striate. 'I'here occurs a red variety, sometimes 

 yellowish-red, as in a specimen found by Miss Mestayer at Lyall Bay, or 

 bright cinnabar red, as in a specimen I found in Hauraki Gulf. This latter 

 specimen is also banded with white on the girdle, and the lateral areas of 

 valves 3 — 5 are clouded with light black. 



Hah. — Cape Egmont, west coast of North Island (R. Murdoch) ; Lyall 

 Bay (Miss Mestayer); Hauraki Gulf (H. S.). 



Chiton hutioni, Suter. 



This species will be described and figured in Trans. N. Zeal. Inst., 

 vol. xxxviii, to be published in 1906. This species also belongs to the 

 canalculafjis group, its usual colour is yellowish-olive, but a brick-red variety 

 is also met with. 



Aeanthopleura (Mausferia) g-ranulata, Gmelin, sp. 



Cliiton (jranulatus, Ginelin : Syst. Nat., 1790, vol. iii, pi. 16, p. 3205. 



Aeanthopleura ( Maugeria) granulata, Pilsbry : Man. Conch, (i), 1893, 



vol. xiv, p. 227, pi. Ix. 

 ,, „ corticata, Suter : Proc. Malac. Soc. Lond., 



1897, vol. ii, p. 198, figs. 12 — 17 in text. 



At the request of Dr. Pilsbry I sent him the valves and denuded girdle 

 of A. cortkafa, Hutton, for examination, and I was greatly astonished on 

 receiving from him the following information: — '^ A. corticafa, Hutton, is 

 merely a specimen of A. (iranulatu^, Gmelin, of the ^^'est Indies. That 

 species varies a good deal, and we have valves exactly like yours. Ry using 

 the key on page 2 1 7 of Manual you would have brought your specimen to 

 that species." That is quite true, but even if I had found it to be A. 

 granulata I would certauily have doubted the correctness of my identifica- 

 tion, for who would look for a West Indian Chiton in New Zealand ? How- 

 ever, Dr. Pilsbry is right. There is now a fine, perfect specimen in the 

 Colonial Museum, \N'ellington, which perfectly corresponds with specimens 

 from the West Indies kindly presented to me by Dr. Pilsbry. 



Another mollusc we share with the West Indies is Pecton mediuH, 

 Lamk., of which our P. iatiaMatuA, according to Hedley, is a synonym. 



