CTENOPHORA. 249 



sides, and re-descend by two much deeper canals ; the Beroes have 



no heart. Beroe ovata is a beautiful species, seldom exceeding two 



inches 



verse diameter 



Lit* jLJCf UC t/C/trfrW- 1*3 d L/V^dU.tllLH O U/V^^lVOj iWAU\SAA WAV^X* w*_***.^ *- 



and a half in length and one and a half in its larger trans- 

 liameter ; it is described by Browne, in his " Jamaica," as " of 



Fig. 102. Beroe Forskalii (Edwards). 



an oval form, obtusely octangular, hollow, open at the larger 

 extremity, transparent, and of a firm gelatinous consistence ; it 

 contracts and widens with great facility, but is always open and 

 expanded when it swims or moves. The longitudinal radii are 

 strongest in the crown or smallest extremity, where they rise from a 



