CHITON. 
Puate LV. 
Species 19. (Fig. a, 6,c. Mus. Cuming.) 
CuHITON ELEGANS. Chit. test@ oblongo-ovatd, antice sub- 
attenuata, valvis medio lavibus, umbonibus subdepressis, 
deinde striis obliquis utringue obscuré decussatis, late- 
ribus granulatis, granulis minutis, regularibus, sub- 
distantibus ; lutescente, nigro, rufo viridique varié pictd, 
interdum omnino luteo-rufescente aut castaneo-nigri- 
cante ; ligamento corneo, translucido. 
THE ELEGANT Curton. Shell oblong-ovate, somewhat 
attenuated anteriorly, valves smooth towards the 
middle, umboes somewhat depressed, then decus- 
sated with oblique striz, sidgs granulated, granules 
minute, regular, somewhat distant ; yellowish, vari- 
ously painted with black, red, and green, sometimes 
entirely yellowish, red or chesnut black; ligament 
horny, transparent. 
Frems ty, Zool. Journ. vol. iii. p. 203. pl. (supp.) 17. f. 6. 
Hab. Valparaiso, Chili (under stones at low water); 
Frembly, Cuming. 
This beautiful and well-known species, found abun- 
dantly in the Bay of Valparaiso, is extremely variable in 
its general painting; its most constant distinguishing cha- 
racter consists in the lateral portions of the valves being 
minutely, yet conspicuously, granulated. 
Species 20. (Fig. a, and Fig. 6. in Pl. V. Mus. Cuming.) 
Curron MagpaLEneEnsis. Chit. testd elongato-ovatd, valva 
terminali posticdé latiusculd umbonata marginem ver- 
sus peculiariter compressd, anticé attenuata, declivi, 
ambabus rudé radiatim striatis, valvis ceteris areis 
lateralibus peculiariter Pinneformibus, rude striatis, 
centralibus striis rudibus subdistantibus longitudinaliter 
undulatis ; vitriolo-virescente, umbonibus roseis, liga- 
mento corneo, rugoso-arenaceo. 
Tue Macpatena Cuiton. Shell elongately ovate, 
the terminal posterior valve rather broad, umbo- 
nated, and peculiarly compressed towards the margin, 
anterior attenuated, standing forward, both rudely 
radiately striated, the rest of the valves with the 
lateral areas peculiarly Pinna-shaped, and rudely 
striated, the central areas with rude longitudinal 
strie, waved and rather distant; light copperas 
green, umbones pink; ligament horny, roughly 
arenaceous. 
Hrnps, Moll. Voyage of H.M.S. Sulphur, p.54. pl. 19. f.1. 
Hab. Bay of Magdalena, California (in considerable num- 
bers on the rocks); Hinds. 
A very characteristic species ; though approaching closely 
in detail of sculpture to the C. australis, the peculiarities 
of form and structure above noted amply distinguish it. 
Species 21. (Mus. Cuming.) 
CuITON bissuNcTUS. Chit. testd oblongo-ovatd, valvis 
peculiariter disjunctis, levibus aut concentricé striatis, 
terminalibus ceterarum areisque lateralibus granulosis, 
granulis perpaucis, sparsis aut radiatim dispositis ; 
chocolato-fuscd, albido nigro-flammeo interdum solita- 
rius ornatd, granulis vivide sapphiro-ceruleis ; liga- 
mento corneo, translucido. 
THE DISJOINED CuITON. Shell oblong-ovate, the valves 
peculiarly disjoined, smooth or concentrically stri- 
ated, terminal valves and lateral areas of the rest very 
finely granulated, granules very few in number, scat- 
tered or disposed in rays; chocolate-brown, some- 
times solitarily marked with white, curiously flamed 
with black, granules bright sapphire blue; ligament 
horny, somewhat transparent. 
Frems ty, Zool. Journal, vol. ii. p. 203. 
Hab. Valparaiso (under stones in mud at low water); 
Cuming. 
This is a remarkable species both in respect of form 
and painting; the valves are not disjoined in reality, but 
have that appearance outwardly, in consequence of being 
enveloped to a certain extent, by horny ligament. The 
chief peculiarity in the painting consists in the bright blue 
granules, but these are so minute as to be easily overlooked. 
Species 22. (Mus. Cuming.) 
Cuiton CoaQvIMBENSIS. 
valvd terminali anticad levigatd, posticd utringue cari- 
naté, caterarum areis lateralibus granoso-carinatis, 
centralibus medio sulcis duobus latiusculis punctatis 
radiatis, sulcis angustis arcuatis numerosis confertis 
prope laterum carinas; nigricante-chocolato-fuscé ; 
ligamento corneo, subarenaceo, nigricante, processibus 
longitudinaliter oblongis fuscescentibus undique munito. 
Chit. testa subelongato-ovatd, 
February, 1847. 
