45 



The setae have the usual shape; the superior pairs are situated 

 quite dorsally, the inferior ones at the ventral side of the body. In 

 the anterior segments the setae of each couple are separated by a 

 rather large distance, in the posterior segments they come nearer 

 one to another and are situated at the edges of the quadrangular body. 



The clitellum is characterized by a narrow, folded ridge along 

 segment (XIX) XX — XXV, situated dorsally of the ventral series of 

 setae; the structure of the clitellum shows the same glandular ele- 

 ments as in Glyphidrilus , it is only distinguished by its richness of 

 bloodvessels. There are no copulatory papillae, and the external genital 

 pores are not visible. 



On transverse sections it could be stated, that the va sa defe- 

 rentia open outwards in the groove between segment XXI 

 and XXII, just in the series of the superior setae of the ven- 

 tral couple; a prostate-gland appears not to be present. Three 

 pairs of seminal vesicles are situated in segment IX— XII. Several 

 small spermathecae lie in segment XIV, XV and XVI; in 

 segment XIV there are four pairs of them, one pouch situated 

 next to each seta. The following segment shows five pairs of them; 

 besides the four pairs of the preceding segment, it possesses another 

 one in the lateral field. In the XVTth segment only two pairs of sper- 

 mathecae are present, situated next to the setae of the ventral pair. 

 The epithelium lining the pouch consists of tall columnar cells , except 

 at its median side, where the cells are much lower and flatter like those 

 in Glyphidrilus. All spermathecae are densely filled with spermatozoa. 



Nephridia are present, except in the anterior twelve segments. 

 The gizzard lies in segment VIII. The intestinal canal of some specimens 

 contained a large quantity of diatomaceae; it may therefore be con- 

 cluded , that the worm lives in the soil below the water. The number 

 of earthworms having this manner of life is rather small; besides 

 Criodrilus, Allurus and Glyphidrilus, as stated above, two species 

 of Acanthodrilus , Ac. dalei and Ac. georgianus do also belong to it , 

 according to Mr. Beddard's statement '). 



Though this worm agrees in its external appearance much with 

 Glyphidrilus Weberi, it cannot be ranged in the same genus, as 

 its male pores are not situated on the same segments as in Glyphi- 



1) Proc. R. Ph. Soc. Edinburgh, 1891, p. 208. 



