MR FRANK E. BEDDARD ON THE ANATOMY OE OCNERODRILUS. 571 



the XlVth segment onwards I easily found the funnels, and also in segments VI-IX. 

 I did not observe any funnels in the segments anterior to this, but as they were so 

 crowded with the septal glands, it is more than probable that the funnels were there but 

 escaped my observation. 



The easiest way of demonstrating the external pores of the nephridia is to divide the 

 worm longitudinally, and then to mount the two halves in glycerine. The duct of the 

 nephridium is much more plain in specimens treated in this way than in either longitu- 

 dinal or transverse sections. 



Fig. 2 represents the anterior segments of a specimen of Ocnerodrilus JEiseni, with the 

 nephridiopores indicated. As will be seen, they lie in front of and a little to the outside 

 of the ventral pair of setae in all the segments except the first two and XI and XII. 



§ Testes. 



In the position of these bodies Ocnerodrilus Eiseni differs much from Ocnerodrilus 

 occidentalis. Eisen [1, p. 8] says : — " In Ocnerodrilus .... we find always two 

 pairs of testes of rather minute development and constant size. One pair is situated in 

 the VHIth setigerous segment, where it is affixed to the dissepiment between the VHIth 

 and IXth segment. The second pair is found in the Xth segment, but is affixed to the 

 dissepiment between the IXth and Xth segments. Thus we find the testes affixed to two 

 consecutive dissepiments, but not in two consecutive segments." This description agrees 

 with his figure [1, pi. i. fig. 9], but not with the definition of the genus given on p. 2 of 

 his Memoir. It is there stated that " the testes are two pairs in the VHIth and IXth 

 setigerous segments." 



In a more recent work [2, p. 5, footnote] Eisen redefines Ocnerodrilus, writing that 

 the testes are " two pairs in IXth and Xth segments." 



If the latter definition is to be accepted, with the proviso that " IXth and Xth 

 segments " means IXth and Xth setigerous segments, Ocnerodrilus Eiseni agrees with 

 other species of the genus. 



The testes are small bodies, lying on the Xth and Xlth segments, as in all Earth- 

 worms where there are two pairs present. Although they are not larger than the testes 

 of other Earthworms, they are large as compared with the size of the worm ; they extend 

 right across the segment. 



The first pair of testes are attached to the anterior wall of the segment, and are some- 

 what fusiform in shape. The second pair are attached in a corresponding position to the 

 anterior wall of the Xlth segment (see fig. 8), and have the same shape. It is a little 

 difficult to be certain, in the case of the second pair of testes, whether the attachment is 

 to the anterior or to the posterior wall of the segment. They reach right across, as shown 

 in fig. 8, and come into close contact with the sperm sac of the Xlth segment, where it 

 passes through the septum to become continuous with the sperm sac of the Xllth segment. 



The testes are not enclosed within the sperm sacs, though they are in contact with 

 them for nearly the whole of their length. 



VOL. XXX VI. PART II. (NO. 21). 4 R 



