CHITON.—P.ate XVIII. 
Tt not unfrequently happens that the central areas of a | 
species are smooth, whilst the terminal and lateral areas 
are sculptured, but rarely the reverse of this as in the 
present instance. 
Species 111. (Mus. Cuming.) 
Curron Prorzus. Chit. testd oblongo-ovatd, valvis termi- 
nalibus ceterarum areisque lateralibus radiatim liratis, 
liris subnodulosis, hic illic bifurcatis, posticis numerosis 
brevibus postic® divergentibus, areis centralibus minute 
reticulatis, ad latera elevato-striatis ; olivaceo-viridi 
aurantio-coccineoque variegata ; ligamento squamato- 
coriaceo, tessellato. 
Tue Prorgan Curron. Shell oblong-ovate, terminal 
valves and lateral areas of the rest radiately ridged, 
ridges slightly nodulous, here and there bifurcated, 
the posterior numerous, short, diverging posteriorly, 
central areas minutely reticulated, elevately striated 
at the sides; variegated with olive green and orange- 
scarlet ; ligament squamately coriaceous, tessellated. 
Hab. Newcastle, Australia; Dr. Dieffenbach. 
This very pretty species of which there are numerous 
examples in the British Museum is closely allied to C. lon- 
gicymba, and presents the same picturesque varieties of 
colouring ; its sculpture is more forcibly developed, and on 
the lateral areas, exhibits a bifurcated divergent character. 
Species 112. (Mus. Cuming.) 
CHITON FORTILIRATUS. Chit. testd ovatd, valvis medio sub- 
rostratis, posticd terminalt umbonata, retusa, areis late- 
ralibus concaviusculis, anticé granulatis, centralibus 
fortiter arcuate liratis; lutescente, viridi variegaté, 
medio rufescente tincta ; tigamento corneo. 
THE STRONG-RIDGED CurIton. Shell ovate, valves some- 
what beaked in the middle, posterior terminal valve 
umbonated, blunt, lateral areas rather concave, granu- 
lated anteriorly, central areas strongly arcuately 
ridged; yellowish, variegated with green, stained 
with red in the middle; ligament horny. 
Hab. Raines’ Island, Torres Straits; Capt. Ince, 
The ridges of the central areas of the valves are curved 
in a somewhat concentric style from the umbonal summit ; 
another peculiarity in the species is that only an anterior 
slip of the lateral areas are granulated. 
Species 113. (Mus. Cuming.) 
CHITON cLaTHRATUS. Chit. testd ovatd, elevatiusculd, 
valvis terminalibus ceterarum areisque lateralibus ra- 
diatim rugoso-granatis, centralibus peculiariter crebri- 
clathratis ; nigricante-viridi ; Vigamento subtiliter gra- 
noso-coriaceo, obscure tessellato. 
THE LaTTicED Curton. Shell ovate, rather elevated, 
terminal valves and lateral areas of the rest radiately 
roughly grained, central areas peculiarly closely 
latticed; blackish green; ligament finely granosely 
coriaceous, obscurely tessellated. 
Hab. p 
Distinguished by the closely latticed sculpture of the 
central areas. 
Fig. 114. (Mus. Cuming.) 
The shell here represented is somewhat peculiar in form, 
and the surface appears to be very minutely reticulated ; 
being eroded, however, and the character much obscured, 
I must hesitate to describe it as new. 
For Sp. 114 see Plate XXV. 
Species 115. (Mus. Cuming.) 
CHITON RUGOsUS. Chit. testd oblongo-ovaté, valvis utrin- 
que biradiatim costatis et obseuré corrugatis, medio 
levibus, depressiusculis, valvd anticdé terminali decem- 
costatd, posticé parvd, declivi; albidi aut lutescente, 
rufescente viridique marmoratd, macula parvit nigra hic 
illic notaté; ligamento corneo, setis duris brevibus 
sparsim obsito. 
THE RouGH CurTon. Shell oblong ovate, valves with 
two radiating ribs, and obscurely wrinkled, on each 
side, smooth and rather depressed in the middle, 
anterior terminal valve ten-ribbed, posterior small, 
slanting ; whitish or yellowish, marbled with faint 
red or green and marked here and there with a small 
black spot; ligament horny, sparingly beset with 
hard short bristles. 
Gray, Sowerby Conch. Illus. Cat. no. 6. f. 49. 
Chiton bicolor, Adams. 
Hab. St. Vincents and Trinidad, West Indies (on exposed 
rocks ); Guilding. 
So closely allied in colour and sculpture to the C. setosus 
of Guacomayo, it is important to notice that in that species 
the posterior terminal valve is umbonated and abruptly 
retuse whilst in this it is slanting. 
