110 ANIMALIA ARTICULATA. 



ANNULATA. 



Body divided into numerous rings ; the head hardly dis- 

 tinct from the other segments, and without antennae properly 

 so called ; nervous system composed of a long series of gan- 

 glions, one pair to each ring ; eyes scarcely distinguishable, 

 or entirely wanting ; never organs of hearing or smell ; skin 

 soft, never stony or like bark ; no articulated feet ; stiff hairs, 

 in the greater number, for locomotion ; respiration either by 

 exterior organs analogous to branchiae, or by interior organs 

 having no resemblance to tracheae, or even by the surface of 

 the skin ; red blood inclosed in two systems of vessels, where 

 it moves under the influence of contractile pouches, called 

 hearts by some authors ; mouth presenting either a vent hole 

 or a long piotractile trunk, or small horny jaws ; nearly all 

 live in the water (earth worms or lumbrid excepted); all ap- 

 pear to be more or less carnivorous. Three orders. 



ORDER I. TUBICOL^E. 



*/ 1 f . J ' ( 'f^U'-f i-"f :. '^-.'I .'? " ?'.'* i r l ^f' '-' i. ' ' ' ': '' 



Branchiae in the form of tufts or arbusculae, attached to the 

 head or anterior part of the body ; ordinary habitation in 

 horny or calcareous tubes formed by a transudation of the 

 skin of the animal, or by fragments of shells and particles of 

 mud agglutinated upon a membrane secreted by the animal. 



All the species live in the sea. 



r . .-affl ^^mcrTO ofit 



GENUS AMPHITRITE, Cuv. 



The Amphitrite are known by the gold coloured setae, 

 arranged like a crown or the teeth of a comb on the fore part 

 of their head ; their mouth is surrounded by numerous ten- 

 tacula. 



