48 



University of California Publications. 



[Zoology 



The first suggestion that sexual dimorphism may occur in 

 Aglaoplienia was made by AUman ('83, p. 37). In one of the 

 species obtained by the Challenger Expedition, Aglaoplienia fili- 

 cula, he found two kinds of corbulae, which he described and 

 figured. Each was composed of about seven pairs of alternating 

 leaflets. In the one, the leaflets on each side were confluent later- 

 ally and carried nematophores on the distal border only. In the 

 other, the leaflets were distinct from base to tip, and not only 

 bore nine nematophores on the distal border but more than half 

 as many on the proximal edge. 



Fig. 1. Male corbula of A. diegensis, short type. X 20. 

 Fig. 2. Male corbula of A. diegensis, long type. X 20. 

 Fig. 3. Female corbula of A. diegensis. X 20. 



