204 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 





Fig. 6. Median sagittal section of the copulatory complexes of 

 Planocera trident at a. 



Fig. 7. Scheme of the three large teeth at the cirrus exit of 

 Planocera tridentata, constructed from parasagittal sections. 



Fig. 8. Ventral view of the copulatory complexes of Aquaplana 

 oceanica as seen in the whole specimen. 





