CTENOPHORA, 249 
sides, and re-descend by two much deeper canals; the Berées have 
no heart. erée ovata is a beautiful species, seldom exceeding two 
inches and a half in length and one and a half in its larger trans- 
verse diameter ; it is described by Browne, in his “ Jamaica,” as “ of 
Fig. ro2.—Berée 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 
