610 OLIGOCHAETA 



Forma Makakallensis First papilla upon xvii; two others upon xix, xx ; in every 



case in the middle line of segment. 



Forma Korogweensis First papilla as in last variety ; second and third upon 



xviii/xix and xix. 



Forma Afflnis . . . Like the last, but with the addition of a papilla upon xx. 



Forma Mhondaensis . Male pore xvi/xvii, first papilla upon xvii, another upon xix. 



In all except the last variety the male pore is upon the middle or end of the 

 seventeenth segment. Septa vi/vii-xi/xii are thickened, the first much less than the 

 rest. The sperm-sacs are not described in much detail ; it is only remarked that 

 the sperm-sacs arising from the single sperm -reservoir pass back to the twentieth 

 segment, sometimes even further. The spermiducal glands extend back as far as to the 

 forty-ninth segment ; each is furnished with a double series of short diverticula. The 

 two diverging anterior extremities of the spermathecal sac terminate in a spherical 

 ovarian sac, which is attached to the septum xii/xiii by muscular strands. The 

 oviduct, immediately after receiving the branches from egg-sac and ovarian sac, is 

 provided with several caeca which lodge bundles of spermatozoa. 

 



(2) Polytoreutus magilensis, BEDDARD. 

 P. magilensis, BEDDARD, Q. J. M. S., vol. xxxiv, 1892, p. 243. 



Definition. Length, 360 mm. ; diameter, 8 mm. ; number of segments, 270. Clitellum, 

 XIII-XVII; male pore and spermathecal pore upon a shield-shaped, raised area ; sperma- 

 thecal sac partly double, complicated in structure with two pairs of diverticula, last pair 

 fused for greater part of their length. Hab. Magila, E. Africa. 



This, the largest species of the genus, is of a purplish colour dorsally. Septa v/xi 

 are thickened. The salient points in its anatomy have been referred to under the 

 description of the genus. The complicated reproductive organs are shown on page 607. 



(3) Polytoreutus violaceus, BEDDAED. 

 P. violaceus, BEDDARD, Q. J. M. S., vol. xxxvi, 1894, p. 230. 



Definition. Length, 83 mm.; breadth, 4 mm. ; number of segments, 190. Clitellum, 



XI7-X7II (XVIII). A median papilla upon XXII-XXIII. Spermathecal sac with 



eight pairs of diverticula, a pair to each segment. Hal. Mombasa, E. Africa. 



Even in alcohol this species showed a dark purplish colouration, the under surface 



being yellowish ; the clitellum was also yellow. The setae are nowhere absent except 



the ventralmost setae on each side of the thirteenth segment ; I found setae upon the 



