Report upon the OligocTiaeta. 51 



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

 interrupted by the male area. 



Male area at the 16-20 segments. 



Prostate pores upon moderately large papillae medially from b, 

 but apparently only pressed medially in consequence of the 

 contraction of the male area, originally probably in A. 



Seminal furrows nearly straight, at the 18 segment dislocated 

 laterally. 



Spermathecal pores in b. 



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

 the male organs. 



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

 Prostate tube-like, coiled, occupying only a few segments. Penial 

 setae about 1 - 1 mm. long and proximally ca. 60 ^i thick, diminishing 

 towards the distal end, strongly bent with a curve corresponding to a 

 quarter of an ellipse. Distal end flattened not broadened, about 35 /.t 

 broad, ending in a sharp roundish edge. With exception of the 

 extreme distal end the distal two-third parts of the penial seta are 

 ornamented at the convex side of the bending by densely crowded 

 transverse rows of fine and slender spinelets (often inconspicuous). 



Spermathecae : Ampulla nearly globular ; duct about half as thick 

 and twice as long. Into the distal end of the duct opens a rather 

 shortly and narrowly stalked diverticulum with a thick kidney- 

 shaped or flattened heart-shaped seminal chamber. The stalk of the 

 diverticulum arises from the sinus of the seminal chamber. The 

 latter is provided with a large number of small seminal chambers 

 which are only imperfectly separated from the main central 

 chamber. 



CHILOTA EXCAVATUS (Bedd.). 



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



1897, p. 342. 



1900. Chi lota excavata + ? Ch. sclateri, Michaelsen, Tierreich, x., 

 p. 156, p. 148. 



Loc, Knysna forest (types of Acanthodrilus excavatus and A. 

 sclateri], Knysna, main forest; Dr. E. Warren, leg. Jan., 1911. 



External Characters. Length 35-50 mm., thickness 1-2-1-5 mm., 

 number of segments 78-95. 



Head epilobous. 



Setae ventrally widely paired, dorsally separated, in general 

 aa : ab : be : cd : dd -= 8 : 5 : 8 : 10 : 20. Width of ventral pairs ab 

 diminishing slowly towards the 18 segment, dd -= ca. T \ p. 



