316 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.2 



PLATE 28 



Fig. 32. Lineus vegetus. Asexual reproduction by fragmentation. 

 A, mature worm; B, same, after fragmenting into 21 pieces; 

 C, each piece undergoes regeneration and regulation into a 

 minute worm of normal proportions. 



Fig. 33. L. vegetus. Anterior end of body, showing ocelli and config- 

 uration of brain (^r), cerebral sense organ {cso), lateral 

 nerve {In), and mouth (m). 



Fig. 34. Paranemertes calif ornica. Head, showing arrangement of 

 ocelli. 



Figs. 35, 36. P. californica. Central stylet and basis from larger and 

 smaller individual, indicating striated head of stylet. 



Fig. 37. Procephalothrix spiralis. Mature individual with tightly 

 coiled body, showing position of mouth {m). 



