342 MR. F. E. BEDDAED OK EAKTUMOllMS [Mar. 16, 



(5) AcanthodriJus excavatus, n. sp. 



This species comes from Ku^'sna Forest, " in and under rotten 

 wood, leaves, &c." It is a small slender species, measuring 48 mm. 

 by 1'5 or 2 mm. I counted 90 segments in the individual selected 

 for measurement. It is not unlike both A. amndinis and 

 A. sclateri in general appearance, but may be distinguished at a 

 glance from either of these by the deep excavation upon the 

 segments which bear the three pairs of male pores ; it is this 

 peculiarity which suggested the specific name. 



The 2^rostoinmm is incomplete, and the other external characters 

 are those of the majority of the Cape species. There are, however, 

 so far as I could make out, no genital papilla'. The male pores, as 

 already mentioned, lie in a deep excavation which is bridged over 

 by ridges connecting the two spermiducal pores of each jJau' with 

 each other. 



I studied the anatomy of the worm by longitudinal sections. 



The ditellum extends from segment xiii. to segment xvi. 



The gizzard is slight, as in the two species with which I 

 specially compare the present. There are no calciferous glands, 

 and the intestine commences in segment xvii. Though there are 

 no special calciferous glands, the oesophagus is moniliform in 

 segments xii.-xiv., and its walls are there rather older and 

 exceedingly vascular ; in those segments too the supra-intestinal 

 vessel was especially clear. 



The spermathecie have each a single long and sausage-shaped 

 diverticulum. 



The sperm-sacs are in segments ix.-xi., and, as appears to be 

 always the case when the last pair of sperm-sacs are in the xith 

 segment, there is but a single pair of testes and vas deferens 

 funnels ; these lie in segment x. 



(6) Acanthodrilus sclateri, u. sp. 



This is another small and slender species. The specimen 

 selected for measurement was 45 mm. in length. There were no 

 genital papillae. 



The setie do not appear to converge at the male pores as in some 

 other species of the genus described in the present communication. 



The lyrostomnan is incomplete ; it is not always easy to be 

 certain about the arrangement of the prostomium in these small 

 AcantJiodrili ; so the remarks made here v\ ill apply to other 

 small species, such as A. arundinis &e. The grooves which bound 

 the prostomium where it impinges upon the first segment of the 

 body cease abruptly and are not continued as far as the furrow 

 which separates that segment from the second. In some 

 specimens of this and the other small species it appeared to me 

 that the two furrows by which the prostomium is continued over 

 the first segment met a little way in front of the line dividing 

 that segment from the one following. 



The ditellum occupies segments xiii.-xvi. 



