90 



POPULAR ILLUSTRATIONS OF 



113 



Fig. 111. Physalia utriculus, 

 " Portuguese man-of-war ' 

 (natural size), original by 

 Professor Huxley a, the 

 bladder, or fusiform cceno- 

 sarc, containing the pneu- 

 matophore and its cyst, 

 which occupy all the central 

 unshaded parts; a, the crest, 

 which can be depressed or 

 raised at the will of the 

 animal 6, the long tentacles 

 (reduced one inch in the 

 figure) d, the short ones c, 

 the polypites e, the tenta- 

 cular sac -/, velvety masses, 

 which consist of small poly- 

 pites and their tentacles. 



Fig. 112.- A portion of the long tentacle 

 magnified gr, a longitudinal muscular 

 band, which occupies its posterior 

 wall, and by means of which it 

 assumes the " corkscrew " form, 

 and is able to draw up m prey : h, 

 kidney-shaped bodies, which are seen 

 in Fig. Ill, 6 as mere dots. These 

 bodies contain an immense number 

 of "thread cells," as shown by the 

 round marks. 



Fig. 113.-A polypite magnified i,. 

 " thread cells," which are seen stud- 

 ding the margin of the mouth and 

 neck*, villi on the endoderm of 

 stomach, which is shown to contain 

 particles of food (after Huxley). 



