JAPANESE PALOLO, CEPATOCEPHALE OSAWAI, N. SP. 



23 



5. 



S. 



Woodcuts 5-8. Posterior views of the left side parapodia of epitocous Ceratocephale osavxri. 

 Small circles in the figures indicate the outlines of eggs contained in the paradodia. The 



figures in brackets show the serial position of each parapodium as counted from the 



anteriormost. Magnified 20 X . 



pigmented retinal cup. The greater development of the eyes in 

 the epitoca evidently stands in relation with the free-swimming 

 habit. 



Thoracic and Abdominal Begions. — In the epitocous worm 

 we may speak of the thoracic and the abdominal regions of the 

 body. The boundary between the two regions varies somewhat 

 in different individuals. It lies between the 22nd and the 25th 

 segments in females, and between the 24th and the 27th in males. 



