PLATE VII. 



Fig. 36. Nervous and muscular tracts of the dorsal surface of the hood. Actinotrocha Species B. (Drawn from 



living specimen. ) 

 Fm. :-!7. Lateral view of anterior part of Aclinotrocha Species 1!., showing muscle tracts. (Drawn from living 



specimen. ) 

 Fig. 38. Longitudiual section through the ganglion of an Actinotrocha. -,'_. < >il Immersion. 12 Zeiss Occulare. 



Camera. X665. 

 Fig. 39. Section through a ganglion cell in the collar nerve ring. Actinotrocha Species B. T : ,- Oil Immersion. X8l 



Oc. Camera. 469. 

 Fio. 40. Transverse section through the nerve tract of the ventral collar wall. Actinotrocha Species B. -/, Oi 



Immersion. 12 Zeiss Occulare. Camera. X665. 

 Fio. 41. Transverse- section through the dorsal nerve tract where it passes down along the bases of the tentacles. 



Actinotrocha Species B. r V Oil Immersion. 12 Zeiss Occulare. Camera. 665. 

 Fig. 42. Transverse section through the collar nerve ring. Actinotrocha Species B. yV Oil Immersion. 12 Zeiss 



< leonlaiv. Camera. 665. 

 Fig. 43. Transverse section through the nerve tract around the edge of the hood. Actinotrocha Species B. r\ oil 



Immersion. 12 Zeiss Occulare. Camera. 665. 

 Fig. 44. Transverse section through the hood of .1 tinotrocha Species B. Taken through the sensory papilla. Hoo.l 



aattenedout. ^ Ob. <40c. Camera. <300. 

 Fig. 44a. Continuation of scries 44. Taken through the anterior part of the ganglion, i Ob. X 4 Oc. Camera. 



300, 

 Fie;. 44//. Continuation of series 44. Taken through the ganglion which is invaginated by the action of fixing 



agents. I Ob. X4 0c. Camera. X300. 

 128 



