CHITON. 
Prater XIV. 
Fig. 48. ¢ and d (Mus. Cuming.) 
Curton seticeR. Figured inadvertently under an 
impression that they were distinct species. 
Species 74. (Mus. Cuming.) 
CHITON PETHOLATUS. Chit. testé ovata, valvis, terminali 
posticé minima, striis elevatis, subretusis, creberrimis, 
undulatis, undique concentricé rugatis ; nigra, virescen- 
te-albo variegatd, macula oblongd regulari utrinque 
summitatem umbonalem ; ligamento corneo, setis brevi- 
bus obsito. 
THE SERPENT’s SKIN CurTon. Shell ovate, valves con- 
centrically wrinkled throughout with very close, 
waved, rather blunt, raised strie ; black, variegated 
with pale greenish white, having a regular oblong 
spot down each side the umbonal summit ; ligament 
horny, beset with short bristles. 
Sowrrsy, Mag. Nat. Hist. 1840, Conch. Illus. f. 59, 64,65. 
Hab > 
Allied to C. setiger but more highly sculptured; the 
keels are wanting on the terminal valves, and the style of 
painting is different. 
Species 75. (Mus. Cuming.) 
CuITon sPINIGER. Chit. testd oblongo-ovatd, valvis sub- 
appressis, undique rugulatis et granatis, granarum in- 
terstitiis arearum terminalium et lateralium plus minusve 
peculiariter puncturatis ; olivaceo flavidoque varia ; 
ligamento corneo, latiusculo, spinis calcareis flavidis, 
nunc brevibus subcylindraceis, nunc lanceolatis arcuatis, 
densissimé obsito. 
THE THoRNY Carron. Shell oblong-ovate, valves a little 
appressed, wrinkled and granulated throughout, in- 
terstices between the grains of the terminal and lateral 
areas more or less punctured; variegated with olive 
and yellow; ligament horny, very thickly beset with 
yellow calcareous spines, sometimes short and some- 
what cylindrical, sometimes lanceolate and curved. 
Sowersy, Mag. Nat. Hist. 1840, and Pro. Zool. Soc. 1841. 
Hab. Philippine Islands; Cuming. 
It is important to notice that the terminal and lateral 
areas of this species are curiously punctured; a character 
which with the assistance of a lens may be detected 
without difficulty. The singular calcareous processes of the 
ligament, for they are hardly to be called spines, defer 
materially in the extent of their development; in one 
variety in Mr. Cuming’s possession they are of a curved 
lanceolate form, like miniature Dentalia. 
Species 76. (Mus. Cuming.) 
CHITON OCCIDENTALIS. Chit test@ oblongo-ovatd, valvis, 
posticé terminali umbonaté et retusd, undique granatis, 
granis solitariis, conspicuis ; valcarum lateribus oliva- 
ceis, medio albido, maculd fuscd oblonga latiusculd per 
summitatem umbonalem ; ligamento setis calcareis mi- 
nutis densissime obsito. 
THE WESTERN CuiTon. Shell oblong-ovate, valves, the 
posterior terminal one umbonated and retuse, grained 
throughout, the grains solitary and conspicuous ; sides 
of the valves olive, middle whitish with a rather broad 
oblong brown blotch along the umbonal summit ; 
ligament very thickly crowded with minute calcareous 
bristles. 
Hab. Savannah-le-mer, West Indies. 
Were it not for the unusual occurrence of the same mol- 
lusk inhabiting the West Indies and the Philippine Islands, 
I should have been tempted to regard the species under 
consideration as a remarkable modification of the C. spini- 
ger; there being a great similarity in colour and sculpture, 
whilst the calcareous processes of the ligament are here 
represented by nearly the same structure on the minutest 
possible scale. There is, however, a character in the C. 
spiniger, namely, the punctures of the terminal and lateral 
areas of which I find no trace in the species before me. 
Species 77. (Fig. a and 6 Mus. Cuming.) 
CHITON asstMILis. Chit. testa oblongo-ovatd, valvis ter- 
minalibus decussatim granoso-radiatis, ceteris areis 
lateralibus margine postico serratis, radiatim liatis, 
liris callositatibus oblongis, oblique interruptis, areis 
centralibus vertice levibus, utrinque confertim tenui- 
liratis ; olivaceo-cinered, hic illic saturatiore varia ; 
ligamento squamato-coriaceo, maculis grandibns oliva- 
ceis tessellato. 
THE ASSIMILATING CuiTon. Shell oblong-ovate, ter- 
minal valves decussately granosely rayed, lateral 
March, 1847. 
