149 



Gonosome. Gonothecae siugle, near base of stem, growiug out obliquely directly 

 beneath the hydrothecae, globular and flattened as if pressed froni the sides; mouth cir- 

 cular, with operculum, with a distinct collar-like margin, on the inner surface of which 

 are a number of teetli arranged in a row. 



Colour. Perisarc ligbt brown. 



Locality. Shimotsu-ura, West coast of Kishu, about 2 m, on Sargassum. 



Data. Gonothecae found in January. 



Among many gonothecae some have a belt-like structure around the middle, dividing 

 the whole into two portions and presenting the appearance of a bowl covered over with 

 a second smaller one and the two opening against each other. Such gonothecae are not 



Fig. 128. 



Fig. 127. 



Fig. 126. Sertularia furcata Trask. Nat. Größe, auf Algen wachsend. (I. 1892a Fig. 6.) 

 Fig. 127. S. furcata Trask. Ganzes Stämmchen von vorn mit Gonothek. (I. 1892a Fig. 7.) 

 Fig. 128. S. furcata Trask. Aberrante Gonothekenform. (I. 1892a Fig. 10.) 



