Cirrhipcda, Cfmchifera, and Mollmca. 333 



the collection, which had been formed under my superintendance by the 

 Officers of H.M.S. Adventure and Beagle, employed under my command 

 in surveying the Southern Coast of South America. 



To these gentlemen I am greatly indebted for the unwearied assiduity 

 which they at all times displayed, and for the extent of the collection in 

 this, as well as in other departments of Natural History. 



In the description of the species I have had the benefit of the advice 

 and assistance of my friend Mr. Broderip ; and to his knowledge of the 

 subject, and the attention which he has devoted to my collection, I owe in 

 a great measure the paper which I have now the satisfaction of presenting 

 to the public through the medium of the Zoological Journal. 



Upon examining my specimens Mr. George Sowerby found that he 

 possessed several species not in my collection. These had been obtained 

 during the voyage, and had been purchased from some of the crew by 

 Mr. Sowerby, who handsomely put his acquisitions into my hands for 

 description. I record this act of good feeling towards myself and the 

 officers of the expedition in general with the greater satisfaction, because 

 the same liberality has not been evinced in another quarter. I have been 

 compelled to notice the conduct last alluded to, because, by possibility, 

 some of the novelties collected during the voyage may be published before 

 this communication (which has been delayed by the many laborious duties 

 consequent on such an expedition) issues from the press. 



1. Balanus Psittacus. 



Syn. Lepas Psittacus. Molina, 1., 223. 

 B. testd albido^rosaced, subconicd, elongatdy rudJ,, longitudinaliter 



creberrimk striatd ; radiis transversim striatis ; operculo transverslm 



profunde sulcata, lineis elevatis creberrime plicatis; valvis posticis 



valde productis, acuminatis. 



Habitat ad oras Concepcionis et insulam Chiloe. Mus. Brit., nost., 

 Broderip, Sfc. 



This cirrhiped which, at Concepcion de Chile, is frequently 

 found of a larger size than 5| inches long and 3^ in diameter, forms 

 a very common and highly esteemed food of tlie Natives, by whom 

 it is called Pico, from the acuminated processes of the two posterior 

 opercular valves. The anterior and posterior opercular valves when 

 in contact, present some resemblance to a Parrot's beak, whence 

 Molina's name. It is also found very abundantly at Valdivia and 



