262 



University of California Puhlicaiions. l^ooi-cHiY 



Fig. 10. A group of larvae from 25 to 35 hours old; much expanded, 

 adhering to substratam by narrow posterior end only; no sign of hydranth. 

 Uppermost figure (X38) shows the aimless wandering of the larva from 

 its egg case on a horizontal surface. Other figures X 11(3. 



