50 



ZOOLOGY 



Tubularia indivisa is a marine colonial Hydromedusan 

 borne on a branching anastomosing stolon attached to sub- 



Fia. 38. — A colony of Tubularia 

 indivisa. Alter Allman 

 (natural size). 



1. Ciroumoral tentacles. 



2. Aboral row of tentacles. 



3. Mouth. 



4. Blastostyle. 



5. Hydrocaulus. 



6. Hydrorhiza. 



merged objects. At intervals the stolon sends up straight 

 unbranched stems, each of which terminates in a hydroid person, 

 generally termed a hydranth. The branching stolon may be 



