﻿180 Transactions. — Zoology. 



TONICIA RUBIGINOSA. 



Chiton ruhiginosus. Swains. Ms. 



Oblong ; margin slightly tomentose ; valves rather elevated, sub-carinate, 

 flattened on each side ; 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 inch ; breadth, -2 inch. 



Colour. — Pink, getting yellowish on the back. 



This species is named from a specimen from the late Mr. W. Swainson's 

 cabinet, and now in the Colonial Museum, which is labelled as coming from 

 the island of Kapiti. I do not know whether Mr. Swainson ever published a 

 description of it, but have retained the name written on it to prevent confusion, 

 if such should have been the case. It is also in. the Colonial Museum 

 collection from Kapiti. 



TONICIA ZIG-ZAG. Sp. nOV. 



Oblong ; mantle slightly tomentose ; valves slightly flattened on each side, 

 but not keeled ; posterior margins sloping backwards into a point, crenulated 

 on the sides ; anterior valve with 9 radiating ridges, crossed by fine concentric 

 zig-zag striae ; lateral areas with two, on each side, radiating ridges crossed by 

 fine zig-zag striae ; posterior and median areas with very fine oblique strise 

 diverging from the dorsal line outwards and forwards, crossed by others 

 diverging outwards and backwards, forming an " engine-turned " patt(?rn. ' 



Length, "88 inch ; breadth, -31 inch. 



Colour. — Mantle white ; valves greyish black, with a white stripe on each 

 side of the dorsal line ; interior greenish blue. 



A single specimen is in the Colonial Museum, locality not stated. 



TONICIA CORTICATA. Sp. nOV. 



Oval ; margin naked ; valves much depressed ; posterior margins slightly 

 concave ; lateral areas bounded on either side by a flatly nodulose ridge, the 

 space between being obliquely striated, the strise running outward and back- 

 ward ; median areas rugose, without either distinct lines or granules. 



Length, 1-25 inch ; breadth, 1*13 inch. 



Colour. — Margin black when dry j valves grey ; inside white, covered 

 over with white coralline growth, and small marine algse. 



Founded on a specimen in the Colonial Museum, locality not stated. 



Genus AcantJwpleura. 

 Mantle covered with long spines. 



