46 ART. 4. — EKITARO NOMURA : 



Vaillant, Beddard and Michaelsen, the following may be 

 noted : — 



1. L. hoffmeisteri Clap., L. dugèsi Rybka and L. igneus 

 (Eisen) resemble L. gotoi. 



2. L. udekemianus Cl^p. resembles L. loilleyi. 



In this paper I can not however enter into a detailed com- 

 parison of these forms, and although the resemblances between 

 L. gotoi and L. hoffmeisteri, and between L. loilleyi and L. udeke- 

 mianus are very close, their discussion must be postponed. 



December 20, 1912. 



Postscript. 



While this paper was in preparation for the press my 

 attention was called to two recent papers by Prof. Stephenson, 

 excerpts from which were kindly sent to me by Prof. Goto. 

 They deal among others with a species of Limnodrilus which 

 the author calls socialis and which he found in Lahore and 

 Kandy, India. A perusal of the descriptions has convinced me 

 that Stephenson's L. socials is identical with L. gotoi, though 

 there are some apparent differences between his descriptions and 

 mine, some organs being called by different names. I must 

 therefore go into a brief discussion of these differences in this 

 postscript. 



The septal sacs, which Stephenson regards as appendages 

 of the alimentary canal, are in general of about the same size 

 and shape in the two forms, although in L. gotoi — both in the 

 Ceylon specimens collected by Prof. Willey in a temporary 

 stream in Buller's Eoad, Colombo, on January 16, 1910, and in 

 the Tokyo specimens collected by myself in summer — , so far as 

 my observations go, there are no septal sacs in segment V and 

 those of segment VIII are not notably smaller than those of 

 segments VI and VII, as Stephenson says. Moreover his figure 

 (Trans. Hoy. Soc. Edinburgh, 48, pt. II, 1912, fig. 11) shows 

 the septal sacs to be larger and more elongated dorso-ventrally 



