﻿- HuTTON. — On the New Zealand Chitonidse. 181 



ACANTHOPLEURA COMPLEXA. sp. nov. 



Chiton aculeatus, Quoy and Gaim., nee Lin. nee Barnes. Acantliopleura 

 aculeatus, Gray, " Dieff. N.Z.," Yol. II., p. 245. 



Oval ; margin broad, velvety, with long spines scattered over it ; valves 

 depressed, flattened on each side, sub-carinate ; posterior margins not covering 

 the next at the corners, leather convex, and pointed in the centre ; anterior 

 valve with radiating moniliform ridges ; lateral areas of intermediate plates 

 grannlose with two prominent, radiating, slightly curved ridges on each side ; 

 median areas with finely granular transverse waved lines, which pass imper- 

 ceptibly into the larger lateral grauiilations ; posterior valve small, like the 

 intermediate ones ; centres of valves punctate internally. 



Length, 1 inch ; breadth, "5 inch. 



CofoMr.— Margin reddish brown, varied with darker ; valves greyish, 

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



From the collection of the late Mr. "W". Swainson, locality not stated. 



ACANTHOPLEURA NOBILIS. 



Acanthopleura nohilis, Gray, "Dieff, N.Z.," Vol. II., p. 245. 



Mantle rugose, rough, with scattered long tapering brown bristles ; valves 

 brown, convex, evenly rounded, with very minute dots like shagreen, the 

 lateral area slightly marked with three or four indistinct rays ; inside white ; 

 length three inches (Gray). 



I have only seen a single valve. 



Genus Acanthochcetes. Leach. 



Margin of the mantle spinulose, with nine bundles of spines along each 

 side. 



Australia, Europe. 



ACANTHOCHiETES BIRAMOSUS. 



Chiton biramosus, Quoy and Gaim., " Voy. Astrol.," Vol. III., p. 378. 

 Chiton biramosus, Desh., "Anim. sans Vert.," Vol. VII., p. 516. Acantho- 

 chcetes biramosus, Gray, "Diefi". N.Z.," Vol. II., p. 246. 



Oval, reddish, surrounded with twice branched hairs, margin rough ; 

 valves nearly flat, greenish red or white, transversely striated in. front. 

 Kemarkable for having its mantle covered with very short hairs of an intense 

 brownish red. Upon the mantle are placed rough and bifurcating hairs, 

 forming a double rank ; the valves are nearly straight, and have no keel on 

 the back ; they are greenish white and surrounded by a circle of reddish 

 brown (Deshayes). 



I have seen no specimens. 



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