PLATE XXXVI 



a, proboscis; c, gonads; cc, collar cavity; eg, external gill slit;/, stomach; 

 g, intestine; gc, gill cavity; h, pharynx; i, stolon; ig, internal gill slit; 

 m, month; pd, dorsal wall of the proboscis; r, rectum; rb, dorsal wall of 

 the arms with refractive beads. 



Fig. I. C. fumosus, sagittal section, showing the attachment of the 

 stolon. 



Fig. 2. C. densus, sagittal section, showing the refractive beads in the 

 dorsal wall of the proboscis and arms. 



Fig. 3. C. densus, sagittal section, showdng the gill cavity and the 

 external and internal gill openings. 



Fig. 4. C. densus, transverse section, passing through the external gill 



slit. 



Fig. 5. C. densus, transverse section passing through the gill cavity. 



Fig. 6. C. densus, transverse section passing through the internal gill 

 slit. 



