CHITONID, III 
Genus, CHITON—Linneus. 
Mantle covered with regularly disposed, smooth, imbricate, roundish, 
conspicuous scales. Shell with the valves external, transverse, broad ; 
the hinder valve with the apex superior. 
GC. pellis-serpentis, Quoy; Voy. Astrolabe, iii., p. 381, pl. 74, f- 
17-22; Reeve, Conch. Ic., f- 84; Chenu, f. 2850. Oval; mantle with 
moderate sized scales; valves elevated, rounded, solid, opaque ; pos- 
terior margins curved, meeting in an obtuse point on the back ; terminal 
areas with radiating moniliform lines; lateral areas of intermediate 
valves with curved radiating ribs, concave behind, and crossed by curved 
longitudinal furrows, which are concave upwards ; median areas slightly 
longitudinally striated ; dorsal line smooth and polished on the anterior 
parts of the valves, but striated on the posterior parts ; mantle yellowish 
or greenish-white, with about twenty transverse black bands; valves 
generally greenish-black, passing into yellowish on the back, and with a 
triangular black spot, with its apex pointing backwards, along the dorsal 
line of all the intermediate valves ; it is generally much eroded, but the 
size and colour of the scales on the mantle are always sufficient to dis- 
tinguish it from other New Zealand species. 
Length, 1'5 ; breadth, °75. 
Abundant on rocks between high and low watermarks. 
Pitt’s Island. Auckland to Dunedin. 
GC. sinclairi, Gray, Dieff. N.Z, ii, p. 263; Voy. Erebus and 
Lerror, pl. i, f. 17; Hutton, Trans. N.Z. Inst.,w., ~. 177. Pale brown, 
polished, the terminal valves with many, and the lateral areas with few 
indistinct broad nodulose ridges, the central area polished, with pale 
longitudinal streaks, and with a few short, deep irregular longitudinal 
grooves on the hinder edge of the sides (Gray.) 
Great Barrier Island. ‘Tasmania (Bednall and Reeve.) 
Tenison-Woods says the Tasmanian habitat is doubtful. Differs 
from C. pellis-serpentis in being polished, and in having the central plates 
smooth, except at the outer angles. 
C. stangeri, Reeve, Conch. Ic., f- 150. Shell ovate, terminal 
valves, and lateral areas of the others, rayed with rows of closely packed 
square appressed granules ; central areas smooth in the middle, closely 
ridged on each side ; interstices rather deep; yellow and green, tes- 
selated with green spots ; ligament squamosely coriaceous (Reeve.) 
Perhaps a variety of the last. 
GC. concentricus, Reeve, Conch. Ic., f. 95 ; Hutton, Trans. N.Z. 
Inst., i., p. 176. Shell oblong, ovate, umbones somewhat beaked, 
terminal valves and lateral areas of the rest concentrically grooved ; 
central areas longitudinally ridged ; ridges rather distant; interstices 
hollowed ; posterior terminal valve umbonated and distinguished in the 
middle by a small smooth triangular shield ; bronzed ; mantle granuo- 
sely coriaceous ; tessellated with brown (Reeve.) 
Australia. (Bednall.) New Zealand. (Earl.) 
