59 



ribus variis pictd ; valvis omnibus omninb tninutissime punctulatis, 

 sguamulis marginalibus perexiguis : long. -C^, lat. -iV poli. 

 Hab. ad oras Americae Meridionalis. (Bays of Mexillones, Iquiqui, 



and Arica.) 

 Found on dead shells in from slx to ten fathoms water. A white 

 variety vvith a black border and somevvhat varied with black has been 

 very rarely found. — G. B. S. 



*** Ligamento marginis velutino et fasciculato. 



Chiton iiieudiniformis. Chit. testd oblongd, planiusaild, nigre- 

 scente-viridi ; valvis rotundatis, granulosis ; valvarmn areis centra- 

 libus elongatis, posticfi acuminatis, leeviusculis ; margine densis- 

 sime pilosd, ąuasi velutind, fasciculis pilorum 9, concoloribus : 

 long. 1, lat. -į-ipoll. 



Hab. ad littora Peruviae (Ancon, Lobos Island, and Payta), et ad 

 insulis Gallapagos, (Chatham Island.) 



Found under slones at lovv water. — G. B. S. 



**** Ligamento marginis sąuamoso. 



Chiton l^vigatus. Chit. testd ovato- oblongd, planiusculd, Icevi- 

 gatd, subfuscd, nigro ru/ogue longitudinaliter variegatd ; carind 

 marginali obtusd, elevatiusculd inter areas laterales et centrales 

 valvarum intermediarum : long. 1-rV. l(it- tVj poli. 



Hab. sub lapidibus in Sinu Californiensi. 



Found under stones at lovv water, by Mr. Ealing of H. M. S. Sap-[ 

 phire, at Guaymas. — G. B. S. 



Chiton articulatus. Chit. testd ovatd, ItBvigatd, viridescente- 

 ftiscd, pallescente longitudinaliter variegatd; dorso elevatiusculo, 

 rotundato, carind marginali inter areas laterales et centrales val- 

 varum intermediarum f ere obliteratd ; limbo olivaceo pallide ar- 

 ticulato : long. 2vV. l(it. \-^ poli. 

 Hab. sub lapidibus in Sinu Californiensi. (St. Blas.) 

 Found under stones at lovv water. In many characters itresembles 

 Chit. tavigatus, but differs in its proportions as well as in tUe parti- 

 cular form of each valve. — G, B. S. 



Genus CvctosTOMA. ' t^ .<rM 



Cyclostoma flavum. Cycl. testd subglobosd, Jlavd, crassitisculd, 



anfractibus 5, creberrime fasciato-striatis; striis elevalisį umbi- 



lico parvo ; operculo corneo : long. -^, lat. -rV poli. 



Hab. in Annaa. ., 



This, at first sight, has all the aspect of a marine shell, and even 



when examined more accurately bears a close resemblance to Litto- 



rina, especially in its operculum. But it was found alive, by Mr. Cu- 



ming, buried in the earth under the roots of a palm-tree, which was 



surrounded with vegetation, and at a considerable distance from high 



water mark. May it not be one of the links vvhich connect the marine 



with the terrestrial Mollusca ? I have placed it vvith the Cyclosto- 



viata, to vvhich genus among the land shells it seems to be most 



nearly related. — W. J. B. 



