10 



ART. 11. — A. IZUKA : OBSERVATIONS ON THE 



7. 



.?. 





np.p; 



iip.a. La. v.r.. 



Woodcuts 1-4. Parapodia of the atocous phase of Ceratocephale osawai, from the left side. 



All in posterior view. The figures in brackets indicate the serial number of each 



parapodium as counted from the fust. 

 7), dorsal ramus ; d.a., dorsal acicula ; d.c, dorsal cirrus ; L, ligula ; La., lower anterior bunch 



of bristles; l.p., lower posterior bunch of bristles; sp., Spinndrüsen; vp.a., upper 



anterior bunch of bristles; up.p., upper posterior bunch of bristles; F., ventral ramus ; 



v.o., ventral acicula ; v.c, ventral cirrus. 



flattened in the antero-posterior direction ; it is richly supplied 

 with a vascular network. 



The dorsal ramus is further provided with an acicula and a 

 bundle of bristles. The acicula (d.a.) is of the usual simple shape 

 and of a blackish color. It lies imbedded in the ramus, except 

 its pointed tip which projects outwards between the ligula base 



