﻿HuTTON. — On a Sjiecimen of Mus rattus. 183 



Genus Cryptoconchus. Guildiug. 



Mantle large, enveloping the greater part of tlie valves ; exposed portions 

 of valves longer than broad, 

 California, 



Crtptoconchus Zelandicus. 



Chiton Zelandicus, Quoy and Gaim., "Yoy. AstroL," Vol. III., p, 400. 

 Chiton Zelandicus, Desk, " Anim. sans Vert.," Yol. YIL, p. 518. 

 Chitonellus Zelandicus, Gray, " Dieff. N.Z.," Yol. II., p. 246. 



Elongated oblong ; margin scaly, with a row of short spines round the 

 edge ; mantle lai'ge, continuous under the apex of each valve ; valves depressed, 

 rounded, sub-carinate ; posterior margin concave with an acute point ; exposed 

 portions of valves small, smooth on the dorsal line, granulose on each side ; 

 nine tufts of spines on each side, situated over the valves. 



Length, "45 inch ; breadth, '15 inch. 



Colour. — Blackish brown ; exposed portion of the valves yellowish ; spines 

 yellowish brown. 



Two specimens are in the Colonial Museum, locality not stated ; obtained 

 by dredging. 



Cryptoconchus monticulakis. 



Chiton monticularis, Quo J and Gaim., "Yoy. AstroL," Yol. III., p. 406. 

 Chiton monticularis, Desh., " Anim. sans Yert.," Yol. YIL, p. 519. 

 Amicula vnonticularis, Gray, "Dieff. N.Z.," Yol. II., p. 246. 



Oblong ; mantle smooth, covering the whole body except a small linear 

 opening at the apex of each valve ; valves depressed, rounded ; posterior 

 margins convex and emai-ginated ; exposed portions of valves smooth ; nine 

 bundles of spines on each side, situated over the valves. 



Length, 1 inch ; breadth, -45 inch. 



Colour. — Dark reddish brown when dry ; inside greenish grey. 



Two specimens are in the Colonial Museum, locality not stated ; obtained 

 by dredging. 



Art. XXIY. — Description of a Specimen of Mus rattus, L. in the Colonial 

 Museum. By Captain F. W. Hutton, F.G.S. 



\Read before the Wellington Philosophical Society, 28th October, 1871.] 



Front feet with four, and hind feet with five toes ; thumb of the hind foot 

 with a short claw. Tail considerably longer than the head and body, scaly, 

 covered with short black hairs to the tip. Ears long, rounded at the tip, 



