320 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



PLATE 30 



Fig. 39. Zygonemertes virescens. Variations in the number and ar- 

 rangement of ocelli and in size of central stylet and basis in 

 young and older individuals; the stylet and basis in a and e 

 are drawn at the same scale of magnification. 



Fig. 40. Emplectonema gracile. Variations in the number and ar- 

 rangement of ocelli and in size of stylet apparatus in young 

 (<2 and c) and older {b and d) individual. In proboscis of 

 young individual represented in c the central stylet and ba- 

 sis have been discarded and replaced by a set of larger size; 

 d, stylet apparatus of large individual drawn at the same 

 scale of magnification. 



