CIRKIPEDIA. 171 



ble stems form an exquisitely beautiful apparatus, 

 admirably adapted to entangle any nutritious 

 atoms, or minute living creatures, that may happen 

 to be present in the circumscribed space over 

 which this singular casting-net is thrown, and 

 drag them down into the vicinity of the mouth, 

 where, being seized by the jaws, they are crushed 

 and prepared for digestion. No sense but that of 

 touch is required for the success of this singular 

 mode of fishing ; and the delicacy with which the 

 tentacles perceive the slightest contact of a foreign 

 body, shows that they are eminently sensible to 

 tactile impressions." * 



Authority, Identification, Localities, &c. 



The paramount authority on all subjects con- 

 nected with the Class is Mr. Darwin's "Mono- 

 graph" above cited; from whom I have given 

 sufficient directions for identification of specimens ; 

 while localities and habits will be indicated in 

 detail. 



CIRRIPEDIA. 



Cemented to other bodies by the head. Arche- 

 type composed of seventeen segments, the first 

 three of which are; large, and almost wholly de- 

 veloped into a carapace, [i.e. the valves and stalk,] 

 not wholly sloughed, and capable of various move- 

 ments ; antennae none in the adult state ; eyes 

 rudimentary; mouth prominent; thorax attached 

 to the internal surface of the carapace, generally 

 bearing six pairs of two-branched, many-jointed 

 limbs, which are thrown out to capture prey; 

 * General Outline, p. 356. 



