94 



CLASS CIRRHIPEDA. 



ORDER CIRRHIPEDA SEDENTARJA, 



(Sendentary Cirrhipeds.) 



The Acorn-Shell, {Balanus.) 



Mr. Thomson describes his discovery of the real nature 

 of the Cirrhipeds, in these words. " On April 28, 1823, 

 which the author had devoted to the investigation of 

 some marine productions, he was returning home without 

 any addition to his stock of knowledge, when, casually 

 throwing out a small muslin towing-net, on crossing the 

 ferry at Passage, such a capture of marine animals was 

 made, as furnished a treat which few can ever expect to 

 meet, and could hardly be excelled for the variety, rarity, 

 and interesting nature of the animals taken." After 

 mentioning the names of several very rare species, he 

 continues "and others perfectly nondescript, and inca- 

 pable of being associated in any of our classifications of 

 the Crustacea; of this description is the little animal 

 about to be described. 



Balanus, (The Acorn-Shell Barnacle.) 



" There is a small translucent animal one-tenth of an 

 inch long, of a somewhat elliptic form, moderately com- 



