240 Dr. W. B. Benham on an 
in &. paradoxus they occur on somites xix., Xx., and xxl, 
In R. Gulielmus the clitellum occupies almost the same 
somites as in the present species, viz. xv. to xxv., the tuber- 
cula have an identical position, and the same difference in 
regard to the ventral limit of the clitellum is noted and figured 
by Beddard for that species. 
The nephridiopores, as in other species, are in line with 
the outer (lateral) couple of chete, the first pair being on 
somite iv. 
The male pores were quite evident between the somites 
xix./xx., in a lme with the second chete on each side. ‘This 
is the position assigned to these pores by Perrier. Neither 
Horst nor Beddard sueceeded in detecting them; but in a 
specimen of &. Gulielmus which I possess I find them to lie 
between somites xx./xxi. J! could not detect any other 
genital pores on the surface. 
There are no dorsal pores. 
Internal Anatomy. 
There is a great displacement of the internal organs, owing 
to the infundibulate nature of the septa, so that the organs 
appear to lie in somites considerably posterior to those to 
which they actually belong. 
None of the septa are strong ; in fact they are all particularly 
thin and transparent, and are therefore difficult to trace, for they 
overlap one another and allow the organs below them to be 
seen. But it the septa fail us inapportioning the organs to their 
true morphological position in the body, we have an excellent 
guide in the nephridia, which, as Horst noticed in his species, 
are very conspicuous; and by following them to their 
external pores I was able to determine the real somites to 
which the various other organs belong. ‘These rephridia, as 
Beddard tound in &. Gulielmus and is frequently the case in 
other genera *, differ in their size and shape &e. in different 
regions of the body. 
The first pair, or “ peptonephridia”’ as I have called them*, 
differs from the rest both in the greater length of the convo- 
luted tube (Pl. X. fig. 4) and its more glandular appearance, 
and in the tact that the duct communicates with the gut and 
not with the exterior. ‘The convoluted tube, forming a bilobed 
glandular-looking mass, lies about halfway along the ceso- 
phagus (fig. 2, 2/¢.) at its side; from it the large muscular 
duct passes forwards and downwards, soon coming to lie 
* Benham, “An Attempt to Classify Earthworms,” Quart. Journ. 
Micr. Sci. xxxi. p. 212. 
