Cirrhipeda, Conchifera, and Mollusca. 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. Baxanus Psirvacus. 
Syn. Lepas Psittacus.. Molina, 1., 223. 
B. testd aibido-rosaced, subconicd, elongatd, rudi, longitudinaliter 
creberrimé striata ; radiis (ransversim striatis ; operculo transversim 
profundé sulcato, lineis elevatis creberrime plicatis; valvis posticis 
valde productis, acuminatis. 
Habitat ad oras Concepcionis et insulam Chiloe. Mus. Brit., nost., 
Broderip, §c. 
This cirrhiped which, at Concepcion de Chile, is frequently 
found of a larger size than 54 inches long and 34 in diameter, forms 
a very common and highly esteemed food of the Natives, by whom 
it is called Pico, from the acuminated processes of the two posterior 
opercular valyes. 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 
