ORGANIZATION OF C ER ATOCE PH A LE OSAWAI. 



Explanation of Plate XII. 



(Ceratocephale osawai Iz.). 

 EXPLANATION OF REFERENCE LETTERS 



a. c. g. t Anterior cirrus ganglion 



ac. (vs. c, Accessory oesophageal connectives. 



<vs. c, Œsophagea] commissure 



cil. y Cilia. 



c. m.. Circular muscle. 

 cit., Cuticle. 



d. c , Dorsal cirrus. 



d. I. }//., Dorsal longitudinal muscle. 



d. v., Dorsal vessel. 



dì', v., Dorso-ventral vessel. 



i. o. g., Infra-uesophageal ganglion. 



in. I , Inner layer of the wall of nephridial funnel. 



inf. pa., Inferior parapodial artery. 



int., Nerve going to the intersegmental partition 



/., Ligula. 



/. a , Lateral artery. 



/. v., Lateral vein. 



Nucleus. 



neph., Nephridium. 



ncpli p., Nephridiopore. 



neph. st , Nephrostome. 



o. m , Oblique muscle 



ont. I., Outer layer of the wall of nephridial funnel. 



p. c. g., Posterior cirrus ganglion 



pd. g. Parapodial ganglion. 



pr.g., Proboscidial ganglion. 



se a., Subcutaneous artery. 



sc. v., Subcutaneous vein. 



