108 POLYPLACOPHORA. 



posterior margins straight, produced into an acute central point; 

 lateral areas indistinct, the whole surface rather coarsely granular, 

 the granules smaller on the back. Length '45, breadth '2 inch. 

 Color pink, getting yellowish on the back. (Hutton.*) 



Cook Strait; Foveaux Straits (H. Filhol.) New Zealand. 

 Tonicia rubiginosa HUTTON, Trans. N. Z. Inst. iv, p. 180 (1872) ; 

 Man. N. Z. Moll., p. 114. Chiton rubiginosus SWAINSON in coll. 



ACANTHOPLEURA coMPLEXA Hutton. Oval ; margin broad, 

 velvety, with long spines scattered over it ; valves depressed, flat- 

 tened on each side, subcarinate ; posterior margins not covering the 

 next at the corners, rather convex, and pointed in the center; ante- 

 rior valve with radiating moniliform ridges; lateral areas of inter- 

 mediate plates gran u lose with two prominent, radiating, slightly 

 curved ridges on each side ; median areas with finely granular trans- 

 verse waved lines, which pass imperceptibly into the larger lateral 

 granulations; posterior valve small, like the intermediate ones; 

 centers of valves punctate internally. Length, 1 inch ; breadth '5 

 inch. (Hutton). 



Color: margin reddish-brown, varied with darker; valves grey- 

 ish, more or less varied with yellowish-white, yellow, or brown. 

 (Hutton^ 



Habitat unknown. 



Acanthopleura complex? HUTTON, Trans. New Zealand Institute 

 iv, p. 181 (1872). 



Hutton gives as synonyms " Chiton aculeatus Quoy and Gaim.,nec 

 Linn., nee Barnes. Acanthopleura aculeatus Gray, Dieff. N. Z., vol. 

 ii, p. 245 "; and in his Manual of N. Z. Moll., 1880, he places com- 

 plexa in the synonymy of Mopalia ciliata. It is obvious that the first 

 references are incorrect, Quoy's aculeatus being merely a form of 

 Acanthopleura spinigera, with which species Button's description 

 can in no way be made to agree. Whether complexa is astray spec- 

 imen of Mopalia (an exclusively North Pacific genus) can only be 

 decided by an examination of the type. Von Martens has so 

 affirmed (Zool. Rec. x, p. 151). 



9. West Indian species. 



LEPIDOPLEURUS CORROSUS Rochebr. Shell ovate, subcarinated ; 

 ashen, covered with minute black points. Anterior valve, posterior 

 area of posterior valve and lateral areas of intermediate valves cor- 



