ON PAEAVVEIGHTIA EOBrSTA. 



195 



the presence of the thick perisarc (about 25 /u thick). In 

 the case of the male gonophore I have not actually seen such 

 an opening- developed, but its position is clearly indicated by 

 the dipping in of the ectoderm and the cluster of nematocysts 

 (PL XXXIII, fig. 5; text-fig. 4, a.) The ectodermal epi- 

 thelium of the ectotheca lining the umbrella-cavity is seen in 



Text-fig. 4. 



A. Female gonophore, lougitiidiual section, 

 transverse section. 



B. Male gonophore. 



^.< 



c.s. Capsnle of Schizophyte. n. Nematocysts. u.c. Umbrella-cavity. 

 en.l. Endodormal lamella, o. Ovum. fl. Follicle cells, r.c. Eadial 

 canal, ch-. Laminated perisarc. sp. Canals opening into nmbrella- 

 cavity. x l-K). 



PI. XXXIV, fig. 6, 11. o. e., and of the endotheca, as distinct 

 from the spermatic tissue, at e. c. The space marked u. s. is 

 one of the channels which opens into the umbrella-cavity at 

 the apical region of the gonophore. The spaces marked cli. 

 occur irregularly through the spermatic mass. A distinct 

 circular canal is not formed. 



