380 MR. F. E. BEDDARD ON THE [JuRClS, 



8. Perich^ta intermedia, n. sp. 



The prostomium does not divide the buccal segment. 



The setce form a nearly complete ring round each segment, failing for 

 a short space in the mid-dorsal and mid-ventral lines. 



Dorsal pores absent. 



Clitellum 1 



Alimentary tract. The gizzard lies in segment v. ; it is small and 

 inconspicuous. The calciferous glands present the appearance of 

 dilatations of the oesophagus in segments x. and xi. 



Nephridia are a series of paired tubes, opening by laterally placed 

 orifices. 



Sperm-sacs in segments ix., x., xi., xii. 



Vasa deferentia open on to segments x. and xi. 



The atrium is tubular as in Acanthoclrilus ; it is not furnished with 

 a sac of penial setae ; the vas deferens of each side appears to open in 

 common with it. 



Intersegmental septa separating segments viii.-xv. very greatly 

 thickened. 



Receptacula ovorum are conspicuous on the anterior septum of 

 segment xiv. 



Spermathecce four pairs in segments v.-viii. ; each is furnished with 

 a minute diverticulum lying to the inner side. 



9. PERICHiETA ANTARCTICA (Baird). 



Magascolex (Perichceta) antarctica, Baird, Journ. Linn. Soc. 

 vol. xi. p. 96. 



P. antarctica, Beddard, Proc. Roy. Soc. Edinb. vol. xiv. p. 175. 



Genus Neodrilus, F. E. B. 



Neodrilus, F. E. Beddard, P. R. Soc. Edinb. vol. xiv. p. 157. 



Closely resembling Acanthodrilus, but differing in the presence of 

 only a single pair of tubular atria in segment xvii, and a single pair of 

 spermathecse in viii. Each spermatheca is furnished with a very large 

 diverticulum lying in the anterior segment. Nephridia paired and 

 alternate in position. 



10. Neodrilus monocystis, F. E. B. 



N. monocystis, F. E. Beddard, P. R. Soc. Edinb. vol. xiv. p. 157. 



Rhododrilus, nov. gen. 



Setae in 8 series. Clitellum occupying segments xiv.-xvii. ; atria 

 tubular ; penial setae present ; vasa deferentia opening on to the 

 exterior on the same segment (xvii.), but independently of atria ; 

 gizzard present. 



This genub comes near to Cryptodrilus and Megascolides, and 

 possibly includes some species described by Fletcher (5) under these 

 two genera. In the former genus I place those species with lobate 

 atria like those of Perichceta ; Megascolides includes species which 

 have tubular atria, no penial setae, and a clitellum extending as far as 

 segment xx. or further. 



