54 



HANDBOOK OF INVERTEBRATE ZOOLOGY. 



which run off from the four corners of the stomach to- 

 wards the edge of the umbrella. These are very difficult 



3. 



FIG. 27. 



FIG. 27. Oral surface of the same medusa. (Drawn from nature by 

 W. K. Brooks.) 



a. Manubrium. b. Neck of manubrium. c. Radiating chymiferous 

 tubes, d. Reproductive organs, c. Enlarged bases of tentacles. /. Oto- 

 cysts. g. Velum. 1. Radial tentacles. 2. Median inter-radial tentacles. 

 S. Tentacles which carry otocysts. 



