— 12 — 
Sect. 12. Onithochiton Gray. 
Valve transvers®, externe; lamina insertionis valve anticz pauci- 
lobata, postice subemarginata, integra, mediarum bilobata; limbus cor- 
neus setis brevibus dense obsitus. 
Species examinala. 
Chiton undulatus Quoy. Australia. 
Sect. 13. Enoplochiton Gray. 
Valve transvers®e, subcordiformes, externe; lamina insertionis 
valve antice paucilobata, postice subobsoleta, integra et recedens, me- 
diarum bilobata; limbus corneus, squamis oblongis caleareis inequalibus 
prostratis sparse onustus. 
Species examinala. 
Chiton niger Barnes. Chili. 
Sect. 14. Aulacochiton Shuttl. 
Valve, transvers®, extern@; lamina insertionis valve antie®e pauei- 
lobata, postice profunde emarginats obsolete lobata, mediarum bilobata; 
limbus postice fissus, squamis parvis ovatis inordinatis densissime ob- 
situs. 
Species examinala. 
Chiton Volvox Reeve. Australia. 
Huc etiam ex icone pertinere videtur, 
Chiton eimolius Reeve. Australia. 
Sect. 15. Schizochiton Gray. 
Valve subcordiformes, elongate, externe; lamina insertionis val- 
varum terminalium paucilobata, postice profunde fissa, mediarum sub- 
trilobata; limbus latus, corneus, postice fissus, squamulis minutis are- 
naceis et aliis cylindraceis curvatis sparse obsitus. 
Species examinala. 
Chiton ineisus Sowb. Ins. Philipp. 
Sect. 16. Mopalia Gray. 
„Valve transvers® externe; lamina insertionis modica, valve an- 
tice —?, postice lobo rotundo pradita; limbus modice latus, postice 
augustior, setosus“ ex Gray. 
Sectio mihi ignota; huc refert Gray species sequentes, 
Chiton Hindsii Sowb. Amer. vcc. 
» Simpsoniü Gray. > 
„ Blainvillei Sowb. Ins. Lobos. 
