56 MR. F. E. BEDDARD ON [Feb. 4, 



fourteenth, and extending over three to six segments. (iizzard 

 always present and single ; intestines frequently provided with a pair 

 of conical caeca. Nephridia generally diffuse. Spermathecse nearly 

 always^ furnished with one or more diverticula; atria (prostates) 

 always present, and sometimes penial setae. 



(I) Genus Perich^eta, Schmarda. 



Setse numerous, and forming a continuous or nearly continuous 

 row round all the segments of the body ". Nephridia diffuse, with 

 many external pores in each segment. Atria (prostates) branched 

 and lobate. Dorsal pores present (? always). Penial setse some- 

 times present. 



Distribution. World-wide, especially tropics of Old World and 

 Australia. 



Subg. 1. Perich^ta (Beddard). — Line of setae continuous; 

 clitellum consisting of 3 segments only (14-16). One or 

 more pairs of intestinal caeca. Gizzard posterior to 7th 

 segment, occupying 2 segments, the septum between which 

 has disappeared. 



Subg. 2. Megascolex^ (Beddard). — Line of setae interrupted ; 

 clitellum occupying more than 3 segments. Caeca generally 

 absent. Gizzard usually situated in, or in front of, segment 

 7 ; occupjiugonly one segment. 



(2) Genus Perionyx, Perrier. 



Setae forming a continuous row round each segment ; generative 

 pores closely approximated in middle ventral line ; atria (prostates) 

 lobate ; nephridia paired ; dorsal pores present. 



Distribution. Lidia and Burmah. 



(3) Genus Diporoch^ta, gen. nov. 



Setae forming a continuous row round each segment ; atria 

 tubular ; nephridia paired. 



(For P. novce zelandice and perhaps P. bakeri.) 

 Distribution. Australia and New Zealand. 



(4) Genus Anisoch^eta, gen. nov. 



Setae 8 in number per segment anteriorly, afterwards increasing 

 up to 30 ; nephridia diffuse ; atria lobate. 

 (For P. attenuata, P. enormis, and P. coxii.) 

 Distribution. Australia. 



^ The only exception appears to be Mcgascolex caruleus ; but this matter 

 requires reexamination. 



^ Except of course the peristoniial segment. 



^ N.B. — These clivisions will not do unless Prof. Bourne finns, as lie has 

 thought possible, that such species as P. burliarcnsis and 1'. hulikaknsk should 

 be separated as distinct genera. 



