104 



The exhibition of the collection of Shells formed by Mr.Cuming on 

 the western coast of South America and in the South Pacific Ocean 

 was resumed, and the following new species were characterized by 

 Mr. Broderip and Mr. G. B. Sowerby. 



Genus Chiton. 

 * Ligamento marginis laevi. 



Chiton bipunctatus. — Chit, testd ovatd, Icevi, virescente, nigro, al- 



bidoque varid ; margine concolori, plerumque maculd albd utrin- 



que inter valvam primam et secundum posita : long. ^, lat. \ poll. 



Hab. ad oias Peruviae. (Inner Lobos Island.) 



Found under stones at low water. This species varies much in 



its colouring, some specimens being nearly black, others light 



green, and some much and prettily varied. In almost all a white 



mark may be observed on the margin just behind the anterior 



valve.— G. B. S. 



Chiton exiguus. Chit, testd oblongd, minimd, rufescente, an- 



gustd ; valvanmi intermediarum carind dorsali latissimd, tri- 



gond, margine sulcata ; arearum laterulium margine distinctd : 



long. ^V, lat. -iV poll. 



Hab. in Polynesia. (Lord Hood's Island.) 



Found on the Pearl Oysters. This is the smallest species which 



Mr. Sowerby has seen : the dorsal keel of the intermediate valves 



is very broad, and distinguished by a groove on each side. — G. B. S. 



Chiton catenulatus. Chit, testd oblongd, pallidd, virescente va- 

 rid ; valvd anticd, valvarum intermediarum areis lateralibus et 

 valv(B posticce parte posticd radiatim granulosis ; intermediarum 

 areis centralibus et posticce area anticd longitudinaliter scabroso- 

 sulcatis : long. -rV. lat. -rV poll. 

 Hab. ad oras Peruviae. (Inner Lobos Island.) 

 Found under stones at low water. In general appearance this 

 species resembles Chit, liiridus : by careful attention to the above 

 characters it may however be readily distinguished. — G. B. S. 



Chiton graniferus. Chit, testd ovatd, castaned, nigro albidoque 

 varid ; dorso elevato ; valvd anticd radiatim granosd ; valva 

 jmsticcB parte jwsticd et valvarum intermediarum areis lateralibus 

 subradiatim graniferis ; areis centralibus longitudinaliter granoso- 

 lineatis : long. 1, lat. -j\ poll. 



Hab. ad oras Chiliae. 



A single specimen was found on a Mytilus in nine fathoms water 

 at Conception. — G. B. S. 



** Ligamento marginis squamoso. 



Chiton stramineus. Chit, testd ovatd, Icevi, pallid^ stramined ; 

 dorso rotundato ; squatnulis marginalibus sparsis : long. -iV. lot. ^V 

 poll. 

 Hab. ad Insulam Chiloe Chilensium. 



Found under stones at low water. All the specimens are of a 

 uniform pale straw colour.— G. B. S, 



