59 



ribus variis pictd ; valvis omnibus omnirib minutissime punctulatis, 

 squamulis marginalibus perexiguis : long. -,V, lot. X V poll. 

 Hab. ad oras America? Meridionalis. (Bays of Mexillones, Iquiqui, 



and Arica.) 

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

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

 very rarely found. — G. B. S. 



*** Ligamento marginis velutino et fasciculato. 



Chiton hirudiniformis. Chit, testd oblongd, planiusculd, nigre- 

 scente-viridi ; valvis rotundalis, granulosis ; valvarum areis centra- 

 libus elongatis, postice acuminatis, l&viusculis ; margine densis- 

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

 long. 1, lot. ^ poll. 



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

 insulis Gallapagos. (Chatham Island.) 



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



**** Ligamento marginis squamoso. 



Chiton l^evigatus. Chit, testd ovato-oblongd, planiusculd, lcevi~ 

 gatd, subfuscd, nigro rufoque longitudinaliter variegatd ,- carind 

 marginali obtusd, elevatiusculd inter areas laterales et centrales 

 valvarum intermediarum : long. 1 T V, lat. iV, 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 articulatus. Chit, testd ovatd, Icevigatd, viridescente- 

 fuscd, pallescente longitudinaliter variegatd-, dorso elevatiusculo, 

 rotundato, carind marginali inter areas laterales et centrales val- 

 varum intermediarum fere obliteratd ,• limbo 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, lavigatus, but differs in its proportions as well as in the parti- 

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



Genus Cyclostoma. 



Cyclostoma flavum. Cycl. testd subglobosd, Jlavd, crassiusculd 9 

 anfractibus 5, creberrime fasciato- stria tis ; striis elevatis, umbi- 

 lico parvo ; operculo corneo : long. ■&■, lat. A 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 

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

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

 nearly related.— W. J. B. 



