108 



z()()L()(;y 



.SHUT, 



line system, having at first a motamcric arrangement, also occur 

 in the aquatic Amphibia. 



The function of the neuromast-organs has been shown to bo 

 to enable the animal to detect vibrations in the water of too low 

 a frequency to form a sound capable of perception by the ear. 



B 



R 



A' 



Fig. 781.— a, Seusdi-y canals of the left side of the head of a Bony Fisb. (From the Cmnhykhie 

 Naturnl J/i.ttmi/, after Cole.). B, organ of the lateral line (iii:iiroma.-<t)m a tailed Amphibian 

 (setni-diagraiiiinatic) a, epidermic cells, through which are seen />, sensory cells ; <:, sensory 

 haii-s ; A, nerve ; Ji, hyaline tube. ^From Wiedersheim's Vtvlebrata.) 



The sense of taste has for its special organs taste-buds (Fig. 

 782), similar in general character to the end-buds in the skin, and 

 composed of groups of narrow rod-shaped cells. In Fishes these 

 are widely uiistributed in the mouth and branchial cavities, 

 also on the outer surface of the^ head, and in some Fishes 



