Plate IV. 



— 33 



— 34 



— 3S 



— 36 

 0/ 



— 38. 



Fig. 32. Transverse section of the gasterozooid at its base near its transition into the stolons in Sfylasfer 

 gemmascens. i°°lj. 



Longitndinal section of the dactylozooid in Sfylasfer gemmascens. i°°/i. 



Transverse section of a dactylozooid in Plioboflinis syiiiiiiefricus. i°°ji. 



Median longitudinal section of a very young gonophore [(^) in Sfylasfer norvegicus. 45"/,. 



Median longitudinal section of a young gonophore (J*) in Sfylasfer roseus. 45°/,. 



Median longitudinal section of an unripe gonophore (c?) in Sfylasfer norvegicus. i°°/i. 



Median longitudinal section of two gonophores (c^) in Sfylasfer norvegicus. The larger with 

 spadix partially atrophied contains spermatocytes in process of transformation to sperma- 

 tozoa. '3°/,. 



— 39. Median longitudinal section of a gonophore (c?) in Sfylasfer roseus; the spermatocytes in process 



of transformation to spermatozoa. '3°/,. 



— 40. Transverse section of a young gonophore (c?) in Plioboflirus syiiiiiiefricus. 300/,. 



— 41. Median longitudinal section of a gonojjhore (c?) in Plioboflirus synimefricus. 300/,. 



— 42. Median longitudinal section through apex of the fully developed gonophore in (c?) Pliobothrus 



symmetricus. 300/,. 



