CRUSTACEA '. — PYCXOGONHLE. 



637 



Proboscis-like projection, at the extremity of which is the narrow- 

 orifice of the Mouth ; which seems to be furnished with vibratile 

 Cilia, that serve to draw into it the semi-fluid aliment. Instead of 

 being furnished (as in the higher Crustaceans) with two pairs of 



Fig. 330. 



Ammothea pycnogonoides : — a, narrow (Esophagus ; b, Stomach ; 

 c, Intestine ; d. Digestive Ceeca of the Feet-jaws ; e e, Digestive 

 C ca of the Legs. 



Antennas and numerous pairs of 'Feet-jaws,' it has but a single 

 pair of either ; it also bears four minute Ocelli, or rudimentary 

 Eyes, set at a little distance from each other on a sort of tubercle. 

 From the Thorax proceed four pairs of Legs, each composed of 

 several joints, and terminated by a hooked claw ; and by these 

 members the animal drags itself slowly along, instead of walking 

 actively upon them like a crab. The Mouth leads to a very narrow 

 (Esophagus (a), which passes back to the central Stomach (b) 

 situated in the midst of the Thorax, from the hinder end of which 

 a narrow Intestine (c) passes-off, to terminate at the posterior 



