218 Mr. F. E. Beddard on 
The male generative apertures are upon the 18th segment, 
and closely approximated to each other; they are situated 
upon a yellow-coloured area which extends a short way into 
the 17th and 19th segments respectively ; the anterior and 
posterior margins of the 18th segment are slightly bulged at the 
place oceupied by the generative area (fig. 3). The position 
of the generative apertures is somewhat intermediate between 
the condition found in Pertonyax excavatus and in the genus 
Pericheta. Perrier describes and figures the apertures in the 
former species as being very closely approximated to each 
other, indeed actually contiguous, and occupying a depressed 
area distinct from the rest of the segment. In Pertonyx 
M‘Intoshii they appear to be more widely separated from 
each other, and also show a transition towards the arrange- 
ment found in Pertcheta in that the area upon which they 
are situated is not depressed below the rest of the segment and 
so distinctly marked off from it as in Pertonyx excavatus. 
The single female orifice is situated on the 14th segment. 
The situation of the male and female orifices with respect to 
the sete is different. ‘The female orifice is situated ¢n front of, 
while the male orifices are behind the circle of sete, which 
in this part of the segment is somewhat bulged out in front, 
following its anterior margin. 
The two pairs of spermathecee are situated in the 8th and 
9th seements and open between the 7th and 8th and the 8th 
and 9th, as in Perionyx excavatus; they also agree in form 
with the spermathece of P. excavatus, and consist each (fig. 8) 
of a simple sac without any development of supplementary 
pouches, which are always present, and in such great variety, 
in Pericheta and Megascolex. 
The segmental organs exist in all the segments of the body, 
and seem to be of a larger size in the first ten or eleven seg- 
ments. They are of the ordinary form, resembling those of 
the common earthworm ; their apertures are evidently in the 
anterior part of each segment close to the median ventral line, 
but I did not succeed in seeing them. The presence of these 
seemental organs at once distinguishes the genus Pertonyx 
from Meyascolex; in the latter genus, as Perrier and Horst 
have shown, the segmental organs when present are invari- 
ably represented by tufts of glandular tubes, differing entirely 
from the typical segmental organs of the other Oligocheeta*. 
* A possible exception to this is Perzchetaleucocycla, Schm. Schmarda 
(loc, cit.) gives some account of the segmental tubes (Schleimdriisen) of this 
species ; and it seems likely from his description that they are similar 
to the segmental tubes of Perionyx and other Oligocheta. Schmarda’s 
ficure of P. leucocycla, moreover, is not at all unlike my Perionyx M‘In- 
tushit; and though his description is rather different, it is not impossible 
that the two species will eventually prove to be identical. 
