PLATE IX. 



Fio. 4r>. Longitudinal section through the ganglion, showing lobe collar mesentery. T j Oil Immersion. X4 Oc. 



Camera. X 293. 

 Fig. 45a. Longitudinal section through ganglion, showing retractor and mesentery, ,'j Oil Immersion. X 4 Oc. 



Camera.. X 293. 

 Fig. 456. Longitudinal section through the Adinotrocha, showing incomplete part of lobe collar septum. \ Ob. 



- X 4 Oc. t 'amera. X 200. 

 Fig. 46. Horizontal section through A dinotrocha Species B. ,', <>l>. 4 Oc. Camera. X 200. 

 Fig. 47. View showing muscles of inner surface of hood. From living specimen. Ob. x 8 Oe. Camera. 

 Fio. 48. Sagittal section through Actiitatmrhfi Species B. J Ob. X 4 Oc. Camera, x 150. 

 Fig. 49. Longitudinal section through the posterior end of Adinotrocha Species B. r V Oil Immersion. 4 <>,. 



Camera. 293. 

 Fig. 50. Longitudinal section through Adinotrocha Species \., showing relations of larval collar cavity and adult 



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

 132 



