I! i' port upon flic Oligochaeta. 53 



Prostate pores between the lines of setae a and b, nearer to the 

 latter. 



Seminal furrows laterally convex, passing the 18 segment laterally 

 from the setae ab, which here are normally developed. 



Spermathecal pores in b. 



Copulatory organs : Unpaired copulatory cushions ventral and 

 median in the 11-21 segments, and in addition more or less indistinct 

 paired ones in all or some of the segments : 7, 8, 9 and 15. 



Internal Anatomy. Alimentary tract : A large gizzard in front of 

 the male organs. No distinct calciferous glands. 



Male organs : Two pairs of sperm-sacs in the 9 and 11 segments. 

 Prostates very long, reaching backwards about as far as to the 

 30 segment, straight or forming some slight windings, in the whole 

 length attached to the long sacs of the penial setae, with relatively 

 long and slender duct. Penial setae very long and slender, string- 

 like, about 6 mm. long and only 14-15 p. thick, slightly bent. 

 Distal end often bent somewhat more strongly (but not in a spiral 

 or like a corkscrew), slightly broadened and flattened, somewhat 

 hollowed at one side, nearly spoon-shaped (with some transverse 

 rows of very fine spinelets?). 



Spermathecae : Ampulla globular or pear-shaped, with a short 

 and narrow duct. Into the duct opens a large tubular diverticulurn, 

 which is much longer than the ampulla and swollen at the proximal 

 end to form a simple seminal chamber. This seminal chamber 

 is pear-shaped or globular. 



CHILOTA PHOTODILUS (Bedd.). 



1897. Acanthodrilus phutodilus, Beddard in P. Zool. Soc., London, 



1897, p. 343. 

 1900. Chilota photodila, Michaelsen in Tierreich, x., p. 148. 



Loc. Knysna forest (types of Acanthodrilus photodilus). Knysna, 

 main forest; Dr. E. Warren, leg. Jan., 1911. 



External Characters. Length 60-145 mm., thickness about 

 3-5-3-6 mm., number of segments 102-158. 



Head tanylobous. 



Setae ventrally widely paired, dorsally very widely paired as far 

 as separated. In general aa : ab : be : cd == 3:2:3-4:3. Width 

 of ventral pairs a little diminished towards the 18 segment. 

 dd == ca. f p.. 



Nephridial pores in the lines of setae c. 



Clitellum ring-shaped, at the 13-16 segments (-- 4). 



