K. KINOSHITA : ON A NEW ANTIPATHAKIAN. 



form, B. lyra Brook, which resembles the specimens under consideration 

 with respect to the mode of branching In addition to lateral 

 pinnules, this species has a median inconspicuous row of bristle-like 

 branclilets, which give the colony an appearence quite similar to that 

 of Hexapathes. The resemblance seems to indicate an intimate natural 

 relationship between these two forms, rather than a mere accidental 

 convergence. And now there remains to be confirmed whether or 

 not BatJiypatJics lyra has really ten mesenteries as was stated by 

 Brook in the diagnosis of the Schizopathinoe. Nowhere in his report have 

 I been able to find any special description of that species concerning 

 this point. If the latter species has really ten mesenteries, it will be 

 reasonable to doubt, that the presence or absence of he sulco- and 

 sulculolateral mesenteries is a characteristic of great taxonomic 

 value. In the present state of our knowledge, however, we have but 

 to follow Schultze's system and I may place Hexapathes in the 

 Cladopathinae, as the second genus of the subfamily. In conclusion I 

 will draw up a diagnosis of the new genus, selecting the main charac- 

 teristics of the form for the purpose. 



Hexapathes ». g- 



Stem simple, with simple lateral pinnules arranged in two 

 longitudinal rows, and with simple branchlets borne on the anterior 

 surface of stem ; spines of axis short, turned upwards ; polyps elongate 

 in transverse axis ; mouth situated on a high projection of peristome ; 

 stomodoeum long, nearly reaching the axis sheath ; sagittal tentacles 

 given off from the level of the lower end of stomodaeum ; me- 

 senteries six in number. 



Oct 2i, 1910, 



