CTENOPHORA. 



24S 



and in its movements and curious appendages is one of 

 the most wonderful of all the Jellyfishes. It is transpa- 

 rent, and besides the eight rows of fringes mentioned 

 above, it has two most extraordinary tentacles one on 

 either side of the body ; and no form of expansion or 

 contraction, or curve or spiral, can be conceived which 

 these tentacles may not assume. 



Bolina and Idyia are other Ctenophora common on 



Fig. 473. — Pleurobrachia. 



the northeast coast of the United States. The Rose- 

 colored Idyia is three or four inches long, and shaped 



