CHITON. 
Puate II. 
Species 5. (Mus. Cuming.) 
Curron Stcunus. Chit. testd ovatd, valvis terminalibus 
radiatim striatis, striis planatis, basen versus gradatin 
latioribus, valvd posticd superne umbonata, ceteris areis 
centralibus medio levibus, utrinque fortiter longitudi- 
naliter liratis, areis lateralibus radiatim elevato-stria- 
tis, striis par paria divergentibus ; pallidé spadiced, 
arearum lateralium marginibus anticis albipunctatis ; 
ligamento subtiliter granoso-coriaceo, spadiceo-rufo exi- 
liter marmorato. 
Tur Srcrutan Curron. Shell ovate, terminal valves 
radiately striated, strie flattened, gradually broader 
towards the base, posterior valve umbonated, the rest 
with the central areas smooth in the middle, strongly 
longitudinally ridged on each side, lateral areas 
radiately elevately striated, striee diverging in pairs; 
light drab, anterior edges of the lateral areas dotted 
white ; ligament finely granosely coriaceous, drab, 
faintly marbled with dull red. 
Gray, Spicilegia Zoologica, p. 5. 
Chiton squamosus, var. aactorum. 
Chiton Polit, Deshayes (not of Philippi). 
Hab. Sicily. 
Before the prolific discoveries of Chitons elicited the at- 
tention of naturalists to the minute, yet unerring distinctions 
of sculpture which are now presented to us, there were 
probably several species confounded under the old Lin- 
nean title sguwamosus. Amongst the number was that 
under consideration, an inhabitant of the Mediterranean, 
amply distinguished, notwithstanding its general resem- 
blance, from the original C. sguamosus of the West Indies. 
Lamarck, and even the expositor of the Mediterranean 
eonchology, Philippi, failed to discover the remarkable 
want of similarity in the detail of these species, and it is 
through the observations of Mr. Gray, whose secession from 
conchological pursuits, (in the elucidation of species, at 
least,) is to be deplored, that the difference was first noted, 
in his ‘ Spicilegia Zoologica’. M. Deshayes with his usual 
acumen appears to have made the same discovery, and, 
unacquainted with Mr. Gray’s researches, distinguished 
the Sicilian species by the new title of C. Polii; the 
honoured name of the Neapolitan anatomist, was, how- 
ever, already occupied by Philippi, in reference to another 
species. For particulars in which the C. Siculus and squa- 
mosus differ, see Sp. 16. 
Species 6. (Mus. Cuming.) 
CHITON MaARMORAtUS. , Chit. testd ovaté vel oblongo- 
ovata, valvis omnibus levigatis aut minutissimé creber- 
rime puncturatis ; cinereo-albida, olivaceo-nigricante 
peculiariter variegaté et marmorata ; ligamento squa- 
mato-coriaceo, cinereo-albo, nigricante plus minusve 
marmorato. 
THE MARBLED Curron. Shell ovate or oblong-ovate, all 
the valves smooth or very minutely closely punc- 
tured; cinereous white, peouliarly variegated and 
marbled witholive-black; ligament squamately cori- 
aceous, cinereous white, more or less marbled with 
black. 
GMELIN, Syst. Nat. p. 3205. 
Hab. > 
Though a species of comparatively ancient date, it is 
not one of common occurrence ; the surface of the valves 
has a smooth polished appearance, but upon examining it 
with the assistance of the lens, it will be found to have a 
minute shagreen appearance, or studded with the finest 
and closest possible superficial punctures. The coriaceous 
grains of the ligament are of an oval squamate form. 
Species 7. (Mus. Cuming.) 
CHITON articuLatus. Chit. testd suborbiculari-ovata, 
valvis omnibus levibus aut minutissimé et creberrimée 
puncturatis ; olivaced, medio virescente, nigro ad wn- 
bones et utrinque maculata, arearum lateralium mar- 
ginibus posticis pallide olivaceo nigroque articulatis ; 
ligamento squamato-coriaceo, olivaceo-virescente, ma- 
culis grandibus saturatioribus marmorato. 
THE ARTICULATED CuiTon. Shell somewhat orbicularly 
ovate, all the valves smooth, or very minutely and 
closely punctured; olive, greenish in the middle, 
blotched at the umbones and on each side with black, 
posterior edges of the lateral areas articulated with 
black and pale olive; ligament squamately cori- 
aceous, olive-green, marbled with large blotches of a 
darker tint. 
SoweErsy, Pro. Zool. Soc., 1832. p. 59. 
Hab. St. Blas, Bay of California (under stones at low 
water); Cuming. 
This species is perfectly distinct from the preceding, but 
partakes very much nevertheless of its characters; the 
valves are smooth yet alike distinguished by that minute 
February, 1847. 
