GOO Dr. F. E. Beddaid on 



slio^ certainly very small setae anteriorly, but much larger 

 ones and stiffly projecting posteriorly and, indeed, for the 

 greater part of tlie body. This may be claimed, as I think, 

 as a distinct mark of specific distinctness of the two species. 

 So also is the presence of dorsal pores — a rare occurrence, 

 as is known, in Eudrilids. In his earlier paper jNlichaelsen 

 remarks that these pores were not seen; but does not allude 

 to them in his later memoir upon Notykiis. They are quite 

 distinct in my species, but only after tl.e clitellum, and 

 are plainer perhaps in specimen A than in specimens B 

 and 0. 



In agreement with the characters of N. emini, my species 

 has a. pi'usfomium which is extended for a short distance on 

 to the first segment. 



The clitellum was developed only in A and (' ; as I judge 

 from an internal inspection it occupies segments 15, 16, and 

 is developed completely all round the body. These facts 

 are as in N. emini. 



The spermuthecal pore and associated pores are on seg- 

 ment 13 (and perhaps 14, see later), and the first examination 

 of the worms from external characters only would perhaps 

 lead to the separation of them into two species. In A — 

 and specimen C hardly differs — the aperture is elongated 

 from right to left, and measures about 1*5 mm. in length ; 

 its margins are rather tumid and furrowed at right angles 

 to the long axis of the actual aperture. The aperture when 

 viewed carefully shows that it is divided internally into two 

 pores with a flat dividing area. But these lie within the 

 single area and are thus sunk below the surface of the body. 

 In s})ecimen B, however, tiie whole arrangement of the 

 various orifices is so different that it is, at first, difficult to 

 refer the two worms to the same species. I believe, how- 

 ever, that they are thus united, for reasons which will appear 

 presently. Here (in specimen B, which, it is to be remem- 

 bered, is less mature, having no clitellum and also with the 

 internal organs of sex less developed^ there is a conspicuous 

 crescentic spermathecal pore with quite unswollen lips, and 

 with the convexity of the crescent directed forwards ; behind 

 this are two large orifices nearly meeting in the middle line, 

 with the actual lumen blocked by folds of membrane sug- 

 gestive of a prolapsus. The three apertures lie in an area 

 which is about 3 mm. across and is furrowed, the Hues 

 running longitudinally. 



It is clear on a priori grounds that the retraction of the 

 two large pores of specimen B would produce a state of 

 affairs such as is to be noted in specimens A and C. 



