PLATE X. 



Fig. 51. — Transverse section through Actinotrocha Species A. Taken through ganglion. J Ob. X4 0c. Camera. 



X 225. 

 Fig. 51a. — Continuation of series 51. J Ob. X4 0c. Camera. X 225. 

 Fig. 516. — Continuation of series 51. J Ob. X4 0c. Camera. X 225. 

 Fig. 51c. — Continuation of series 51. | Ob. X4 0c. Camera. X225. 

 Fig. 51 d. — Continuation of series 51. J Ob. X4 0c. Camera. X225. 

 Flo. oli-. — Continuation of series 51. \ Ob. X 4 Oe. Camera. X 225. 

 Fig. 51/. — Continuation of series 51. ^ Ob. X4 0c. Camera. X225. 

 Fio. olg. — Continuation of series 51. Taken through the collar segment. Showing the lining drawn away from the 



ectodermal wall. \ Ob. -4 0c. Camera. X 225. 

 Fig. 51h. — Continuation of series 51. Taken through collar region just anterior to bases of the ventral tentacles. 



i Ob. ■ 4 Dr. Camera. ■ 225. 

 Fig. 52. — Transverse section through the nephridial canal. Actinotrocha Species B. ,'. oil Immersion. 12 Zeiss 



Comp. Occulare. Camera. -1400. 

 Fig. 52a. — Continuation of series 52. Taken through the lower branch of the nephridial canal, ,'j Oil Immersion. 



12 Zeiss Com]). Occulare. Camera. X 1400. 

 Fut. 526. — Continuation of series 52. Taken through the end of the upper branch of the nephridial canal, /.oil 



Immersion. 12 Zeiss Comp. Occulare. Camera. .1000. 

 Fio. 52c. — Longitudinal section through one of the cellular processes at the end of the nephridium. Showing two 



nuclei. r V Oil Immersion. 12 Zeiss Comp. Occulare. Camera. X 1000. 

 Fnt. 52d. — Same as fig. 52c. Showing one nucleus, j 1 . Oil Immersion. 12 Zeiss Comp. Occulare. Camera. 



X 1000. 

 Kiit. 52c — Transverse section through the end of a process. ,'. Oil Immersion. 12 Zeiss Comp. Occulare. Camera. 



X 1000. 

 Fig. 52/. — Transverse section through the proximal half of the processes. ,-'..- oil Immersion. 12 Zeiss Comp. 



Occulare. ( iamera. X 1000. 

 Fnt. 52g. — Longitudinal section through anterior end of a nephridium. Actinotrocha Species B. f 'j Oil Immersion. 



12 Zeiss Com]). Occulare. Camera. X 1000. 

 134 



