DIFFERENTIATION IN HYDROID COLONIES. 



153 



Table XI. 



Measurements in mm. X 95- 



striithiotiides may exceed 23 cm. in length. Aglaophenia sp. has 

 a particularly stringy, sprawling habit. The character is of no 

 practical value in the present connection. 



Aglaophenia sp. — This species differs from A. struthionides in 

 no particulars essential to the present discussion. 



n 



^7 



26 



Fig. 6. A. diegensis, X 45- 



Table XII. 



Distance from tip of nematophore to rear of theca along perpendicular to axis of 

 internode. Measurements in mm. X 95- 



Hydrocladium 74 is incomplete, hydrotheca 12 not being terminal. 



