Chiton petaloides. Testa parva, tenuis, ovalis, arcuatim 

 elevata, subcarinata, dilute citrina ; areis lateralibus elevatis, ru- 

 gose granulatis, ct striis radiantibus ad 4 insculptis ; areis centra- 

 libus longitudinaliter rugose granulato-punctatis, et lineolis tenu- 

 issimis angulatis dilute violaccis pictis ; valva posteriori acute 

 umbonala et costa transversali divisa : margo stramineus, minutis- 

 sime granulato-imbricatus. Long. £, lat. § poll. Hab. Sand- 

 wich Islands. 



A very beautiful and peculiar shell, its markings resembling 

 the venatcd petals of some flowers. 



Chiton dentiens. Testa minima, ovata, carinata, olivacea, 

 ad dorsum albido fulminata, omnino minutissime granulata ; areis 

 vix distinctis ; valvis rostratis postice subdenticulatis, dentibus albi- 

 dis : margo pruinosus. Long. }, lat. 2 3 o poll. Hab. Puget 

 Sound. 



Resembles C. allernatus, Sowb., which, however, has radiating 

 ribs upon its lateral areas and terminal valves. 



Chiton incanus. Testa solida, oblongo-ovalis, valde convexa, 

 cinereo et nigro variegata, concentrice undulato-striata, granulis 

 sparsis nigris aspersa, ad dorsum subcarinata et longitudinaliter 

 nigro bifasciata; areis lateralibus vix distinctis: margo aculeis 

 inequalibus curtis curvatis nigris et canescentibus indutus. Long. 

 1 T \, lat. | poll. Hab. New South Wales. 



Like C. piceus, Gray, in general appearance, and still more 

 like C. jietholatus, which has a hairy margin. 



Chiton muscosus. Testa ovalis, depressa, scabra, ad dorsum 

 obtusa, cinereo bifasciata et plumose striata ; valvis magnis, latcra- 

 liter disjunctis ; areis lateralibus parvis, granulis subquadratis radi- 

 antibus arcuatim tessellatis ; areis ccntralibussulcisacutisconfertis 

 flexuosis subparallelis longitudinaliter aratis ; valva antica magna, 

 semicirculari, decemcostata et granulis subquadratis insculpta ; 

 valva posteriori parva, costa transversali inconspicua subtermi- 

 nali : margo latus, filis corneis inequalibus muscosis indutus. 

 Long. 2, lat. 1J- poll. Hab. Puget Sound. 



Allied to C. brevispinosus, but its sculpture and margin are 

 quite distinct. 



Patella talcosa. Testa magna, solida, ponderosa, ovato- 

 rotundata, depressa, costulis radiantibus numerosis sub-equalibus 



