1914.] J- Stephenson : Oligochaeta. 389 



ovaries, with funnels, in xv and xvi. The spermathecae were 

 four pairs, in segments viii-xi, and their apertures were, corres- 

 pondingly, in grooves I-tI. 



The third specimen which was examined, though it showed 

 the male pores, was however quite immature. The male pores 

 were near the ends of a transverse groove on the ventral surface 

 of segment xix; the groove took up more than one-third of the 

 length of the segment (antero-posteriorl}-), and also rather more 

 than one- third of its breadth (transversely) as seen from the 

 ventral surface. There were no setae in the groove, nor, curi- 

 ously, any in the middle of the ventral surface of segment xx, 

 over an interval nearl}' equal to the length of the groove on xix. 

 Internally no sexual organs had been developed ; the gizzard 

 was mostly contamed in segment viii, but extended into ix ; 

 the last heart was in xv. Segment xvii, as seen externally 

 from the dorsal side, was abnormal in being partly double ; there 

 was an extra dorsal pore in the middle of the segment ; the 

 complete ring of setae was situated in front of the pore, while 

 behind and to the right of the supernumerary pore was a short, 

 rather obliquely placed additional row of setae. 



The remarkable features of this worm appear to be (i) its 

 variabilit}^ in regard to the position of the organs of the anterior 

 part of the body, and in the number of the reproductive organs 

 including the spermathecae; that the variability in position of 

 the organs does not depend merely on the intercalation of one or 

 two additional segments is seen from the situation of the gizzard 

 and of the last heart in the three specimens dissected ; (2) the 

 association of micro- and meganephridia, as in the genus Lmnpito ; 

 between which and the bulk of the species of Perionyx the present 

 may be regarded as a connecting form. 



Perionyx kempi sp. nov. 

 (PI. xxvi, fig. II.) 



Five specimens, in tube along with P. koboensis ; in rotten uood ; Kobo, 

 Abor country, alt. 400 ft. ; 30-xi-igii and S-xii-igii. 



Length 3 inches ; breadth nearly 3 mm ; colour light brown, 

 paler ventrally and at anterior end. Dorsal vessel appears as a 

 dark stripe ; the specimens are flattened dorso- ventrally, especially 

 behind the clitellum, the ventral surface appearing as a shallow 

 longitudinal groove. Segments 164 ; except the first two and the 

 clitellar segments, each is 3-annulate (indistinctl)^ so posteriorly). 



Prostomium epilobous ^ ; a transverse groove at the hinder 

 end of the tongue-like process of the prostomium cuts off this 

 latter altogether from the first segment. A longitudinal mid-dorsal 

 groove extends from, the tip of the prostomium to some distance 

 behind the clitellum ; it is well marked as far as the clitellum, and 

 also on the first and last segments of the clitellum itself ; it is 

 faint, over the middle segments of the clitellum, and towards the 

 posterior limit of its extent. 



