Chiton pruinosus. Testa parva, oblongo-elliptica, convexo- 

 elevata, subcarinata, coloribus variis olivaceis, cinereis, et fusco- 

 rubris irrorata et maculata ; areis centralibus sub lente omnino 

 quincuncialiter punctatis ; areis lateralibus longitudinaliter im- 

 bricato-striatis : intus virescens : margo minutissime granulatus, 

 coloribus fuscis et cinereis tessellatus. Long. t 7 q, lat. /^ poll. 

 Hab. Rio Janeiro. 



The sculpture of this very variably-colored species is suffi- 

 ciently characteristic. Between the stria? are usually found 

 minute pores, probably produced by some parasite. 



Chiton viridulus, (Couthouy MS.) Testa tenuis, oblongo- 

 ovata, dilutissime olivacea, ad dorsum sub-carinata, utrinque sub- 

 canaliculata, ubique sub lente quincuncialiter insculpta ; areis 

 centralibus et lateralibus parum distinctis ; lineis increment! prope 

 marginem conspicuis ; valvis terminalibus leviter radiatis : margo 

 minutissime squamatus. Long. -| , lat. /<j poll. Hab. Orange 

 Harbor. 



Chiton puniceus, (Couthouy MS.) Testa parva, oblongo- 

 elliptica, elevata, ad dorsum carinata, punctatissima, punicea, 

 gradibus eetatis conspicuis obtusis signata : areis lateralibus prse- 

 rupte elevatis, et sparsim granulatis ; areis centralibus costulis 

 longitudinalibus parallelis ad 6, plerumque ad medium dislocatis, 

 clathratis ; valva posteriori rostro parvulo acuto et septo transver- 

 sali notato : ligamentum minutissime imbricatum, adversum su- 

 turas albido fasciatum. Long. J-, lat. ^o P°M- Hab. Orange 

 Harbor. 



Very much resembles C. ruber, Lowe. 



Chiton confossus. Testa parva, ovata, fastigiata, pallida, 

 roseo et incarnato concinne variegata ; valvis rostratis ; areis 

 lateralibus elevatis, serie postica squamarum et serie obliqua 

 squamarum majorum ad apicem spectantium finitis ; intervallo 

 lasvigato, et granulis paucis annulatis sparso ; areis centralibus 

 plerumque lsevibus sed punctis sparsis triangularibus retrospec- 

 tantibus confossis ; valva posteriori valde gibbosa, umbone fere 

 terminali, dentibus insertionis 9, et ad valvam anteriorem 25, pec- 

 tinatis : margine fusco, carnoso. Long, f , lat. £ poll. Hab. Fee- 

 jee Islands. 



Allied to C. scuJptus., Sovvb.,' which has three lateral rays and 

 the central areas smooth. 



