26 



ZOOLOGY. 



others swim away in the Epliyra form (Fig. 26), when 

 about a fifth of an inch in diameter, and toward the mid- 

 dle or end of summer become adult Aurelice (Fig. 27). 



Fig. 24.— Scyphistoma of Au- Fig. 25.— Strobila of An- Fig. 26.— Ephyra or ear- 

 relia. relia fluvidula. Mag- liest free condition of 



nified. Aurelia. Magnified. 



An example of the compound Hydroids, called Siphono- 

 phora, is the Physalia, or Portuguese man-of-war (Fig. 28), 

 which is common in the tropics, and is sometimes carried 



Fig. 27.— Aurelia flavidula. Natural size. 



northward by the Gulf Stream. It is excessively poisonous 

 to the touch. In picking up specimens stranded on the 



