CHITON. 
Prats VI. 
Species 28. (Mus. Cuming.) 
CHITon FovEoLatus. Chit. testé ovatd, valvis utrinque 
peculiariter excavatis, terminalibus, posticd umbonatd, 
granoso-radiatis, granis solitariis, ceterarum areis late- 
ralibus solidis, elevatis, granoso-liratis, sulcis intersti- 
tialibus subexcavatis, arearum lateralium declivitatibus 
anticis aut levibus aut oblique corrugato-striatis ; viri- 
descente, olivaceo-fusco varia, vel olivaceo-nigricante, 
areis lateralibus hic illic pallidioribus ; ligamento 
squamato-coriaceo, olivaceo-viridt. 
THE PITTED CurToN. Shell ovate, valves peculiarly ex- 
cavated on each side, terminal valves, the posterior 
umbonated, granosely radiated, grains solitary, lateral 
areas of the rest solid, raised, granosely ridged, inter- 
stitial grooves somewhat hollowed, anterior declivities 
of the lateral areas either smooth or obliquely ridged, 
centrai areas smooth in the middle, obliquely corru- 
gately striated on both sides; greenish, variegated 
with olive-brown, or olive-black, the lateral areas 
being here and there paler; ligament squamately 
coriaceous, olive-green. 
SoweErsy, Mag. Nat. Hist., 1840. Conch. Illus. f. 60. 
Eadem var. Chiton excavatus, Gray ? Sowerby, Conch. Ill. 
f. 131. 
Hab. Jamaica. 
This species is extremely variable in colour and general 
style of painting, though mostly of rather a sombre hue ; 
but it may be readily distinguished by the deeply exca- 
vated recesses between the lateral areas. Although the 
figures of C. foveolatus and excavatus in Mr. Sowerby’s 
‘Conchological Illustrations,’ present such a different 
aspect, I have no doubt of their specific relation, the for- 
mer having been described and figured from an inferior 
example. 
Species 29. (Mus. Cuming.) 
CHITON cRENULATUS. Chit. testd oblongo-ovatd, anticé 
subattenuatd, valvis terminalibus, posticd umbonatd, 
retusa, ceterarum areis lateralibus, rugoso-granulatis, 
granulis irregularibus, vix radiantibus, areis centralibus 
medio unicarinatis, utringue concentrice striatis, striis 
elevatis, undulatis, quasi corrugatis ; albido-rosed, u- 
trinque viridescente, lineis nigro-viridis undulatis, con- 
centricis ornatd ; ligamento corneo, translucido. 
THE CRENULATED CurTon. Shell oblong-ovate, a litle 
attenuated anteriorly, terminal valves, the posterior 
umbonated and retuse, and lateral areas of the rest 
roughly granuled, granules irregular, scarcely radi- 
ating, central areas with a single keel along the mid- 
dle, concentrically striated on both sides, strize raised, 
waved, as if wrinkled; whitish rose, greenish on each 
side, ornamented with very dark green concentric 
waved lines; ligament horny, transparent. 
Broperip, Pro. Zool. Soc., 1832. p. 27. 
Hab. Panama, Central America (under stones below low 
water mark); Cuming. 
The concentric striz of this species form an oblique 
crenulated range, on each side the umbonal eminences, 
which is very characteristic. 
Species 30. (Mus. Cuming.) 
CuHIton patuLus. Chit. testé subabbreviato-ovatd, valvis 
terminalibus ceterarum areisque lateralibus liris brevi- 
bus interruptis decussatim reticulatis, areis centralibus 
tenuissime granuloso-liratis ; anthracind, maculd rudt 
oblonga albida utrinque summitatem umbonalem ; liga- 
mento granoso-coriaceo, granis grandibus, atro. 
THE WIDE CuiTon. Shell somewhat abbreviately ovate, 
terminal valves and lateral areas of the rest decus- 
sately reticulated with short interrupted ridges, cen- 
tral areas very finely granosely ridged; coal-black, 
with a rude oblong whitish blotch on each side the 
wmbonal eminence; ligament granosely coriaceous, 
grains large, jet black. 
SowerBy, Mag. Nat. Aist., 1840. 
Hab. ? 
Conch. Illus. f. 134. 
The difference between the C. patulus and granosus is 
sufficiently manifest, notwithstanding their identity of 
colour and general aspect; the terminal valves and lateral 
areas of the former are rayed with granules, whilst in the 
latter they are characterized by a distinct net-work; the 
C. patulus and Stokesii scarcely differ, except in form and 
obesity, and I very much doubt if they are more than 
local varieties of the same species. I have hesitated, how- 
ever, to adopt this opinion, because Mr. Cuming has 
specimens of each, easily to be recognized from the other 
without any intermediate state. 
February, 1847. 
