131 



Fig. 102. Sertularella Inabai Stechow. 

 Stämmchen mit Gonothek. (I. Fig. 30.) 



Fig. 103. S. Inabai Stechow. 

 O Gonothek. (I. Fig. 31.) 



Gonosome. Female gonothecae very large, nearly iive tiiues as long as the liydro- 

 thecae, attached near the base of the .stein, somewhat like an inverted cone, the upper 

 part broad and the lower narrow, with longitudinal parallel ribs starting from the lower 

 end, gradually becoming more elevated towards the upper end and tenninating each with 

 a conspicuou.s tooth ; mouthpart short, tubulär, and with a circular opening, with six teeth 

 at the niargin. Male gonothecae unknown. 



Colour. Nearly transparent. 



Locality. Bishamon Cove, Sagami Sea, on smaller branches of Sargassum. 



Date. Gonothecae found in January. 



This species has a very peculiar form and is difficult of identification. The genus 

 Diphasia should carry two hydrothecae on each Joint; but in this species they are clearly 

 alternate and there is only one to each Joint. On this point it is more like Sertularella. 

 But the characteristic of the genus Diphasia lies in the structure of the gonotheca rather 

 than in the alternate arrangement of the hydrothecae: the male and female gonothecae 

 are, namely, different in form, the female being larger, divided in the upper part, and 

 containing a marsupial chamber. My species satisfies these points more or less, although 

 the presence of a marsupial chamber cannot be determined, owing to the small number 



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