59 



ribus varlis plctd ; vulvls omnibus omninu minutisshnv punctulatis, 

 squamuUs marginaJibus perexig^us : long. iV, lat. -^- poll. 

 Hah. ad oras Americae Meridionulis. (Bays of Mexillones, Iqulqui, 



and Arica.) 

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

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

 very rarely found. — G. B. S. 



*** Ligamento marginis velutino et fasciculato. 



Chiton hirudiniformis. Chit, tcstd ohlongd, planiusculd, nigre- 

 scenfe-viridi ; valvis rotundatis, granulosis ; valvarum a7-eis centra- 

 libus elongatis, postici' acuminatis, Iceviusculis ; margine densis- 

 sirrie pilosd, quasi velutind, fascicuUs pilorum 9, concoloribus : 

 long. 1 , lat. -^ poll. 



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

 insulis Gailapagos. (Chatham Island.) 



Found under stones at low water. — G. B. S. 



**** Ligamento marginis squamoso. 



Chiton ljevigatus. Chit, testd ovato-oblongd, planiusculd, lavi- 

 gatd, sub/used, nigra rufoque longitudinaliter variegatd ; carind 

 murginali obtusd, elevatiusculd inter areas laterales et centrales 

 valvarum inter me diarum : long. 1^V. /■ctt. -jV, poll. 

 Hab. sub lapidibus in Sinu Californiensi. 



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

 phire, at Guaymas. — G. B. S. 



Chiton artictjlatus. Chit, testd ovatd, lecvigatd, viridescetite- 

 fuscd, pallescente longitudinaliter variegatd; dorso elevatiuscvlo, 

 rotundato, carind marginali inter areas laterales et centrales val- 

 varum intermediarum fere ohliteratd ; Umbo olivaceo pallide ar- 

 ticulato : long. 2^, lat. l-^^ poll. 

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

 Found under stones at low water. In many characters it resembles 

 Chit, lavigalus, but differs in its proportions as well as in the parti- 

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



Genus Cyclostoma. 



Cyclostoma FLAVujr. Cijcl. testd subglobosd, Jlavd, crassiusculd, 

 anfractibus 0, creberrime fasciato-striatis ; striis elevatis; umbi- 

 lico parvo ; operculo corneo : long. -jV> ^ut. ^V poll' 



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 which connect the marine 

 vvith the terrestrial MoUusca ? I have placed it vvith the Cyclosto- 

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

 nearly related. — W. J. B. 



