from <^hili. 203 



***** LIGAMEXTO MAKGINIS L^VIGATO. 



0. Chiton disjiinctus. 



C. test^ oblongo-ovatii, semipellucidS,, polita ; valvarum margi- 

 nibus anticis arcuatis, lateribus rotundatis ; llgamento marginali 

 lato, laevi, hyalino, coloribus variis marmorato, valvis inter- 

 posito. 



Tab. Supp. XVII. f. 5. 



Shell oblong-ovate ; semipellucid, reddish brown, with green 

 and straw coloured markings; inside white. Valves eight, 

 smooth, glossy, anterior margins of the dorsal valves arcuate, and 

 not covered by the superior valve, except at the beaks, which gives 

 the valves a disjointed appearance ; posterior slopes a little de- 

 pressed. Border smooth, broad, hyaline, and when alive beauti- 

 fully marbled with vivid red, green, and blue colours; extending 

 up the back, and nearly separating the valves. 



Length two inches and a half, breadth one and a half. This 

 beautiful and rare shell was first noticed by Mr. Cumings at Val- 

 paraiso, who found it iu company with Chiton elegans. 



10. Chiton elegans. 



C. testa oblongo-ovata, antice angustata, coloribus variis marmo- 

 rata ; areis valvarum lateralibus niinutissime granulosis; liga- 

 mento marginali lato, tenui, coloribus vividis marmorato. 



Tab. Supp. XVII. f. 6. 



Shell oblong ovate, anterior part narrower than the posterior, 

 semi-pellucid, marbled, markings of various colours, generally dark 

 brown, reddish brown, yellow, and sometimes green. Valves 

 eight, beaked, the front valve with very fine excavated and raised 

 dots ; second valve longer than the others, and like them divided 

 into three compartments, the front with fine granulate longitudinal 

 stria?; the two lateral depressed; with numerous fine irregular 

 granulations, and a few minute punctures; a rather broad and 



