ACANTHODRILUS. lOo 



NOTE XIII. 



ON TWO NEW SPECIES OE THE GENUS ACAN- 

 THODRILUS, PERR.') FROM LIBERIA. 



Dr. R. HORST. 



Among the Invertebrates collected by Biittikofer and 

 the late Sala during their journey in Liberia ^) , I found two 

 large earthworms, belonging to the genus Acanthodrilus^). 

 Though the specimens are not very well preserved, I will 

 describe them as good as possible , our knowledge of this 

 interesting genus of Lumbricidae being rather scanty and 

 only based upon the examination of four species: A. oh- 

 tusus Perr. and A. ungulaius Perr. from New-Caledonia, 

 A. vertidllatus Perr. from Madagascar^) and A. kerguele- 

 nensis R. Lank, from Kerguelen Island '"). 



1. Acanthodrilus Schlegelii^ nov. spec. 



The largest of the two worms measures 750 m.m. in length ; 

 its colour on the dorsal side is violet-brown , on the ven- 

 tral side greyish. The setae are arranged in four series 



1) Nouv. Archiv. Muséum d'Hist. Nat. Paris. T. VIII, p. 85. 



2) Confer. Notes fr. the Leydea Museum. Vol. Ill, p. 53. 



3) Biittikofer has been mistaken in ranging them into the genus Lum- 

 bricits (Tijdschr. Aardrijksk. Genootschap. Bijblad N°. 13, 1884, p. 37). 



4) loc. cit. 



5) Philos. Transactions. Vol. 168, p. 264. 



Notes from the Leyden !Museiim , Vol. VI. 



