of a (lull grcenisli or yellow cast, and semitranspa¬ 
rent; but when in action, is (listinf^uishefl hy a 
very hinli degree of phosphoric sjilendor, exhibit¬ 
ing, during each contraction of its body, the ap¬ 
pearance of a har ol iron in the highest degree of 
inrand(!sccnce, and, during each relaxation, passing 
tliro’all the gradations of red, orange, yellow, pale- 
blue, &c. till at length it returns to its first green¬ 
ish-hyaline aspect. It is externally heset with nu¬ 
merous conical elongations or papillae, and within 
ap|)ears to be lined merely hy a smooth vascnlar or 
leticular membrane, without any appearance of in¬ 
testines, &e. Nothing particular is known relative 
to its manner of feeding, production of young, See. 
It is however probable that it is nourished in the 
manner of the Polype, viz. by the absorption of the 
juices o( its inclosed jtrey, which is afterwards eject¬ 
ed by the tnoiith or opening, fn size it often gretitly 
rxcceds the figure represented in the annexed plate. 
