54 ART. 4. 1. IKEDA : 



central part of each papilla there is a clear area surrounded by 

 small horny granules. Papillse on introvert-basis and on the 

 posterior end of body, slightly larger ; most prominent just behind 

 the hood-region of introvert. Small papillse also present in the 

 hooked region of introvert. Tentacles arise from several (5-6) 

 main stems. Two retractor muscles arise from the middle thii'd 

 v)f the body ]3roper. Two segmental organs about half as long- 

 as the body proper ; mesentery entirely lacking. Posterior 

 end of spindle muscle not attached to the body-wall. Three 

 fixing muscles ; one of them attached to the rectum and the 

 others to the œsophagus. Contractile villi remarkably long, but 

 few in number. 



Two alcoholic specimens of this species were found in a 

 zoological collection made in the Hokkaido in 1900 by Me. 

 IzLTKA ; one of them is from Wakkanai (near Cape Soya) and 

 the other from the harbor of Aomori. The latter specimen (Fig. 

 14) is the better preserved, measuring 2.5 mw. in length of the 

 body proper. Both specimens are of a brown color in the pre- 

 served state. The introvert-basis shows on the skin-surface line 

 circular, and somewhat coarser, longitudinal furrows. 



As to the skin-structures and the general anatomy, the 

 specimens agree within certain limits with Selenka's description 

 of Dendrodoma blanduiii which was many years ago obtained by 

 HiLGENDORF at Euoshima. But careful studies of my specimens 

 disclose some important points which either were omitted by 

 Selenka, or are irreconcilable with, his description. However, 

 I do not feel fully justified in establishing a new species on the 

 strength of these aj)parcnt ditïerences, since the specimens at my 

 disposal seem too few to be conclusive. 



