1914- 1 J.Stephenson: Oligochaeta from Northern India. 337 



The dorsal vessel originates in segment xii as a much dilated 

 ' ' heart," which takes up the whole of the length of the segment. 

 The ventral vessel is as usual separate from the alimentary tube 

 throughout the body. 



The nephridia begin in segment vii, and are continued back- 

 wards regularly to segment x, after which there is an interval of 

 three segments (xi-xiii) ; the regular series commences again in xiv. 

 The anteseptal portion is very short, one quarter the length of the 

 post-septal, and consists of an obliquely facing funnel ; there is a 

 marked constriction at the septum, and the post-septal portion is 

 continued backwards and slightly downwards to open on the 

 exterior in front of the ventral setal bundle. The narrower 

 terminal portion or duct is a third to a quarter as long as the 

 mass of the post-septal. In longitudinal sections the post- 

 septal portion is sometimes thin and narrow, sometimes relatively 

 broad; which indicates that this part has a flattened shape, and 

 may be cut vertical to, or parallel with, the plane of flattening. 



The cerebral ganglion (text-fig. 7) is large, of an elongated 

 oval shape in a lateral view of the living animal, and extending 



7 

 Fig. 7 — Eiic/ivTt'oeiis hantrami ; cerebral ganglion, 



from the front of the mouth to the level of the anterior border of 

 the pharynx; it is slightly indented behind. The nerve cells along 

 the course of the ventral nervs cord form a continuous layer on its 

 lower surface, there being no, or only the very slightest, special 

 aggregations (ganglia) in each segment. 



The clitellum is not conspicuous ; it extends over segments 

 xii-xiii. 



The testes are in segment xi, attached to the posterior face of 

 septum TT ; this septum has a large vacuity in its middle portion, 

 and the testis may be turned forwards through this opening and thus 

 come to lie largely in segment x {of. fig i). A pair of sperm-sacs 

 are present, but these differ from the structures which are called 

 by this name in the majority of the lyimicolae. Here the testis is 

 continuous with a mass of sperm-morulae ; the whole, testis and 

 sperm-morulae, are surrounded by a sac of peritoneum, which is 

 attached to septum It at the origin of the testis. The sperm-sacs 

 may therefore lie in the anterior part of segment xi, or in segment 

 X, according as the testis happens to be turned forwards through 



