THE OLIGOCH.ETA OF XATAl, AND ZULULAND. 421 



Head epilobous,^ about h. 



Settti tend to be strictly paired. Median ventral distance 

 about equal to the middle lateral ones. Median dorsal dis- 

 tance a little smaller than half the circumference of the body 

 (aa = he, dd<^ h u). 



Internal Anatomy. — The calciferous glands^ or chyle-sacs 

 as I think they should be called, are characteristic in this 

 species. Externally they are sac-like and broader than the 

 oesophagus which is very narrow in the ninth segment. 

 Ventrally they extend forward in the longitudinal axis of the 

 body from the hinder part of the ninth segment to the front 

 end. They arise laterally from the oesophagus. The lumen 

 is divided by a number of longitudinal septa which spring 

 from the external wall and meet in the mid-axis of the organ. 

 A transverse section has, therefore, a wheel-like appearance. 

 The number of radiating septa varies somewhat in different 

 parts of the organ. The maximum number is in the middle, 

 where I have found seven. The external walls, as well as the 

 septa of the organ, are rather thick and are provided with a 

 system of very narrow canals (" Chylusgefasse "). 



For the remainder of the anatomy reference must be made 

 to the original description by Beddard. 



Sub-fam. ErDKiLiNJ<;. 

 Eudriloides durbanensis Bedd. 



Eiidriloides durbanensis Bedd., '"On some New Species of Earth- 

 worms from various parts of the World." Proc. Zool. Soc. Lond., 

 1892, p. 696, pi. xlvi, figs. 11, U. 1893. 



1 There are certain terms to express the relationship Ijetween the pro- 

 stomium and the peristomial segment: (1) zygolobous, where the 

 prostomium is completely fused with the peristomial segment without 

 showing a dorsal furrow; (2) proloboiis, where the dorsal furrow 

 between them is transverse ; (3) pro-epilobous, where the furrow is con- 

 cave in front ; (1) e p i 1 o ];> o u s, where the furrow is split dorsally to form 

 two longitudinal grooves running backwards, and the extent to which 

 they pass backwards is expressed by a fraction of the length of the 

 peristomium ; (5) tanylobous, where the two longitudinal grooves 

 reach the transverse furrow between the peristomial segment and the 

 segment behind. 



