PLATE IX. 



Fig. 45. — Longitudinal section through the ganglion, showing lobe collar mesentery. r V Oil Immersion. X 4 Oc. 



Camera. X 293. 

 Fir. 45«. — Longitudinal section through ganglion, showing retractor and mesentery. T V Oil Immersion. X 4 Oc. 



Camera. X 293. 

 Fig. 456. — Longitudinal section through the Actinotrocha, showing incomplete part of lobe collar septum. J Ob. 



X 4 Oc. Camera. X 200. 

 Fig. 4fi. — Horizontal section through Actinotrocha Species B. I Ob. X 4 Oc. Camera. X 200. 

 Fig. 47. — View showing muscles of inner surface of hood. From living specimen. | Ob. X 8 Oc. Camera. 

 Fig. 48. — Sagittal section through Actinotrocha Species B. I Ob. X 4 Oc. Camera. X 150. 

 Fig. 49. — Longitudinal section through the posterior end of Actinotrocha Species B. T \, Oil Immersion. X 4 Oc. 



Camera. X 293. 

 Fig. 50. — Longitudinal section through Actinotrocha Species A., showing relations of larval oollar cavity and adult 



collar cavity, i Ob. X 4 Oc. Camera. X 200. 

 132 



