Plate V. 



43- Apex of a gonophore (c?) in Stylastrr roscns, containing spermatoc}'tes in process of trans- 

 formation. 450/j. 



44. Early stage in the development of a seminal duct in Stylastrr norvegicus. 450^. 



45. Longitudinal section through an almost fuH-gto\V'H seminal dnct in Stvhistrr jm/Trgiciis. ^" ,. 



46. Median longitudinal section through a gonophore (?) with ripe ovum in Sfyfttsfrr g.-mi/itiscri/s. 



47. Median longitudinal section of a gonophore (<fr) with ripe ovum in Siylastfr nisrus. ' ,. 



48. Transverse section of a gonophore ($) near the distal end of the spadix iu Sivlasterrosnis. '3 ,. 



49. Transverse section of the spadix close beneath the ovum in S/vhtsfrr gcii/m/ismis. I 3 /,. 



50. Median longitudinal section through a gonophore with advanced planula larva in Sly 



gemmascens. I 3/ 1 . 



