240 PERICHAETA SIEBOLDI. 



NOTE XXXVI. 

 ON PERICHAETA SIEBOLDI HORST 



BY 



Dr. R. HORST. 



In a recent paper on earthworms of Japan by Seitaro 

 Goto and Shinkichi Hatai ^) there is a short note about 

 Perichaeta Sieboldi, a species described by myself several 

 years ago and based on a specimen collected by von Sie- 

 bold in the same country ~). Rosa afterwards examined a 

 couple of individuals belonging to the Museum of Vienna 

 and published a detailed description of this species, in which 

 my own observations were confirmed and amplified ^). 

 Beddard identified with P. Sieboldi a small specimen '*), col- 

 lected by Masatoka Rokugo, but added not much to our 

 knowledge of the worm, while Michaelsen gave an annota- 

 tion ^) about a not quite mature specimen of the Berlin 

 Museum, which differed by having spermathecae with a 

 short and straight diverticulum. 



The principal characters of P. Sieboldi are the presence 

 of three pairs of spermathecae, opening into the interseg- 

 mental groove of segments VI/VII, VII/VIII, Vllt/tX and 

 the number of bristles in this region, being about 80 (76 

 Rosa). However, among the numerous earthworms, examined 

 by our Japanese colleagues, they did not meet with a 



1) Annot. zoolog. japon. vol. II, pt. 3, 1898. 



2) Notes from the Leyden Museum, vol. V, 1883, p. 191. 



3) Aan. K.K. Naturh. Hofmuseums, vol VI, 1891, p. 401. 



4) Zoolog. Jahrbiich. (Abh. fur Syst. etc.), Bd. VI, p. 759. 



5) Archiv. f. Naturgesch., 1892, p. 27. 



Notes from tlie J-ieyden ]VIuseutxi, Vol. XX. 



