I1i4 CHITONID. 
terior, pointed and emarginate ; anterior valve, and lateral areas, with 
radiating moniliform ribs ; posterior and median areas widely, but rather 
irregularly, deeply longitudinally furrowed, with narrow ridges between ; 
margin grey, with broad irregular reddish-brown transverse bands ‘ 
valves greyish-brown ; interior greyish-white. 
Length, 1°75 ; breadth, 75. 
Founded on a specimen in the Colonial Museum, locality not 
stated. 
Genus, TONICIA—Gray. 
Margin of the mantle simple, naked, nearly smooth, or velvety ; last 
valve entire ; valves external, transverse, broad ; the hinder valve with 
the apex superior; lamin of insertion of the terminal valves many 
lobed, those of the middle bi-lobed. 
T. undulata, Quoy,; Voy. Astrolabe, iii., ~, 393. pl. 75, J: 19-243 
Adams, Gen. Moll., pl. 54, f- 3. Oval; valves rounded, polished, sub- 
carinate ; posterior margins straight, produced into a rather acute 
central point ; terminal area of anterior valve, and lateral areas of inter- 
mediate valves, with indistinct radiating moniliform ridges ; posterior 
valve, and median areas of anterior and intermediate valves, with waved 
transverse strize; mantle reddish-brown ; valves generally green, inclin- 
ing, more or less, to yellowish on the back, with the waved strize brown ; 
sometimes the valves are greyish-green, with many of the undulating 
strie white. 
Length, 1°15 ; breadth, °55. 
Auckland to Dunedin. Chatham Islands. ‘Tasmania. 
Not uncommon under stones at low water. 
T. rubiginosa, Hutton, Trans. N.Z. Inst, iv., p. 180. 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 granu- 
lar, the granules smaller on the back; pink, getting-yellowish on the 
back. 
Length, :45; breadth, :2. 
Cook Straits. Foveaux Straits. (H. Filhol.) 
T. lineolata, Zrembly ; Zool. Jour., iii., p. 204; Reeve, Conch. Lc, 
SF 343; Chenu, f. 2867. Shell oblong, ovate, somewhat attenuated 
anteriorly ; terminal valves and lateral areas of the rest very minutely 
granulated ; central areas smooth ; yellowish fulvous, regularly painted 
with reddish-chestnut concentric waved lines, and more or less blotched 
with the same colour; ligament horny, transparent (Reeve.) 
Dunedin. Auckland Islands. Campbell Island. Chili. 
The New Zealand specimens have the valves coloured dark purple- 
black, as in Reeve’s figure, 34 b. 
T. atrata, Sowerby, Mag. Nat. Hest., 1840; Conch. Lllus., f. 57-58; 
heeve, Conch. Lc., f. 103. Shell oblong, ovate; valves smooth ; the ter- 
minal posterior truncated, and lateral areas of the rest obscurely 
