CHITON.—Piats XVI. 
Species 93. (Mus. Cuming.) 
CHITON TRUNCATUS. Chit. testd subelongato-ovati, valvis 
convexis, posticd terminali fortiter umbonatd et trun- 
catd, subasperis, sulcis superficiariis undulatis concen- 
tricé incisis ; luteo-albicante, viridi pulcherrimé varie- 
gatd, summitate umbonali plus minusve rosea ; liga- 
mento corneo, translucido. 
THE TRUNCATED Curton. Shell somewhat elongately 
ovate, valves convex, the posterior terminal being 
strongly umbonated and truncated, little rough, con- 
centrically carved with superficial waved grooves; 
yellowish-white, very beautifully variegated with green, 
unbonal summit, more or less rose; ligament horny, 
transparent. 
Sowersy, Pro, Zool. Soc., 1841. p. 61. 
Hab. Catbalonga, Island of Samar, Philippines (under 
stones at low water); Cuming. 
An extremely pretty species, having somewhat the ap- 
pearance of the C. crenulatus, from which it may be dis- 
tinguished by its different style of sculpture and prominent 
wumbonated growth of the posterior terminal valve. 
Species 94. (Mus. Cuming.) 
Curron Incrt. Chit. testd oblongo-ovatd, valvis termina- 
libus, posticd parva declivi, ceterarum areis lateralibus 
punctis perpaucis radiatis, centralibus sulcis longitudi- 
naliter arcuatis et undulatis exsculptis, summitate 
levibus ; lutescente, roseo nigricante-viridi viridique 
variegaté ; ligamento corneo, subarenaceo. 
Ince’s Curton. Shell oblong-ovate, terminal valves, the 
posterior being small and slanting, and the lateral 
areas of the rest radiated with a few punctures, cen- 
tral areas engraved with longitudinally curved grooves, 
smooth along the summit ; yellowish, variegated with 
pink, blackish green and light green; ligament horny, 
little arenaceous. 
Hab. Raines’ Island, Torres Straits (under stones at low 
water); Capt. Ince. 
Partaking in colour and more or less in other respects 
of the character of the preceding species, from which it 
differs in the absence of the umbonated truncated growth 
of the posterior terminal valve, whilst the sculpture, though 
approximating in design, is distinct, and the lateral areas 
are slightly punctured. 
Species 95. (Mus. Cuming.) 
CHITON concENTRIcUS. Chit. testé oblongo-ovati, umbo- 
nibus subrostratis, valvis terminalibus ceterarum areis- 
que lateralibus concentricé sulcatis, centralibus longitu- 
dinaliter liratis, liris subdistantibus interstitiis exca- 
vatis, valvd terminali posticéd umbonatd, ared parva 
trigond pland medio notaté; eruginosd ; ligamento, 
granoso-coriaceo, fusco tessellato. 
THE CONCENTRIC CuTTon. Shell oblong-ovate, umbones 
somewhat beaked, terminal valves and lateral areas 
of the rest concentrically grooved, central areas lon- 
gitudinally ridged, ridges rather distant, interstices 
hollowed, posterior terminal valve umbonated and 
distinguished in the middle by a small smooth trian- 
gular shield; bronzed; ligament granosely coriaceous, 
tessellated with brown. 
Hab. New Zealand; Harl. 
The arrangement of the sculpture of the terminal and 
lateral areas, present a rare exception, in this species, to 
the general rule, the grooves being transversely concentric 
instead of longitudinally radiate. 
Fig. 96. (Mus. Cuming.) 
The shell here represented proves to be merely a dark 
variety of the C. Siculus. 
For Species 96, see Pl. XVIII. 
