202 DE. W. B. BENHAM OH" 



the dark bands between individual chsetse. Each dark band 

 extends across the pale ventral surface, but becomes much 

 narrower and lighter in colour as it passes downwards from the 

 sides ; this ventral darker band is much broader, although still 

 faint, in segments it., ni., iv. 



This plan of colouring, in alternate light and dark bands, is 

 very frequent in the genus, and has already been described by 

 several observers for various species. 



The clitellum does not entirely embrace the usual segments 

 (fig. 2 &) ; it begins behind the chsetal ring of segment xiY., 

 and extends only as far as the cbsetse on segment xvi. These 

 chsetal rings being lighter than the interchaetal regions, on 

 first impression — especially to a zoologist who may be only 

 familiar with the subfamily Lumbricidae — the clitellum appears to 

 occupy two entire segments, but in reality it covers one whole 

 and two half segments. The clitellum is fully developed, of the 

 usual thickness, and its margins are quite well marked, and it 

 has the same appearance in both worms. The limited extent of 

 the clitellum recalls P. mandhorensis, P. hermudensis, and others. 

 There are complete circles of chfetse on each of the segments xiv., 

 XV., and xvi. 



The male pores are small and circular (fig. 2 «), on rather 

 prominent papilliform porophores {po), of large size, which are 

 separated by 8 chaetae. The prominence of the porophore is in 

 part due to the existence of a horseshoe-shaped depression, deep 

 but narrow, surrounding on three sides the area which carries 

 the pore ; it is deeper in front of than behind the porophore, and 

 the free limbs of the horseshoe are directed externally. An 

 examination of the other specimen suggests that it is due to the 

 extension and union of two crescents, one in front and one 

 behind, the porophore, situated apparently intersegmentally, or 

 just on the borders of the segment xviii. The general description 

 implies an appearance resembling the conditions described for 

 P. novcB hritannicus ; but a comparison of the drawings serves 

 to make clear the differences, and to demonstrate the necessity of 

 such figures to illustrate these small differences, which a mere 

 verbal description is insufficient to convey distinctly to the 

 mind. 



In Perrier's P. aspergillum, Beddard's P. hermudensis, and in 

 E/Osa's P. Mp>pocrepis, the depression is represented by a series of 

 minute pores or " suckers." 



There are three pairs of spermathecal pores situated between 



