Plate IV. 



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

 gemmascens. 3°%. 



33 



34 

 35 

 36 

 37 

 38. 



Longitudinal section of the dactylozooid in Stylastcr gemmascens. $°°/ t . 



Transverse section of a dactylozooid in Pliobothrus symmetricus. 3°%. 



Median longitudinal section of a very young gonophore (J 1 ) in Sty/aster norvegicus. 45°/j. 



Median longitudinal section of a young gonophore (J 1 ) in Stylastcr roseus. 45°/^ 



Median longitudinal section of an unripe gonophore (c?) in Stylastcr norvegiciis. 3°°^. 



Median longitudinal section of two gonophores (c?) in Stylastcr norvegicus. The larger with 

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

 tozoa. l T>°U. 



39. Median longitudinal section of a gonophore (<?) in Stylastcr roseus; the spermatocytes in process 

 of transformation to spermatozoa. 1 i°/ 1 . 



— 40. Transverse section of a young gonophore (J 1 ) in Pliobothrus symmetricus. i°°/ s . 



— 41. Median longitudinal section of a gonophore (0*) in Pliobothrus symmetricus. 3°°/^ 



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



symmetricus. i 00 /^ 



