I IO 



N. ANN AND A IF. : 



Diameter of rotule o.oiS mm. — 0.023 mm. 



Diameter of shaft of biro- 



tulatc 0.0004 • — 0.0006 ,, 



Diameter of gemmule 0.68 ,, . — 0.441 ,, 



The gemmule has a short, straight, broad hut very delicate 

 foraminal tubule. 



Dr. Oka's specimen, which was taken in December 1899, was 

 evidently dead or moribund when obtained. Few cells remain and I 

 am unable to say whether vesicular cells, the presence of which in 

 the parenchyma is charactcrestic of E. miilleri, were present or not. 



Ephyrtafia miilleri Lieberkühn. 



E. miilleri, Weltner, op. cit. p. 125. 



This species is recorded by Weltner from Yedo. There is a 

 small but typical specimen in the collection sent me by Prof. Ijima 

 It was collected by Dr. Oka at Kameido near Tokyo in October, 

 1901 and was evidently in a vigorous condition when killed, although, 

 it contains numerous gemmules. 



The following " key " to the Japanese species of Epiiydatia may 

 be useful to naturalists in Japan, but it must be used with caution in 

 view of the fact that other species may yet be found. 



Key to the species of Ephydatia recorded from Japan. 



A. Shafts of the biro tula tes curved ; rotulac feebly developed. 



a. Skeleton spicules smooth, very slender. Gemmules adherent, 

 with the aperture at the base E. scudspoiigilla. 



