1887.] Mr Frank E. Beddard on Earthworms. 165 
A comparison of the above description with that of Perrier (loc. 
cit. , p. 390) will show that there is some little difference in these 
points from U. corethrurus. Perrier, in fact, states that in his 
species the specially thickened mesenteries are inserted on to the 
posterior margin of segments 5, 7, 8, 9, and 1 1 ; two segments, viz., 
6 and 10, appear therefore to have lost the posterior mesentery, 
instead of only one segment, as in my species. 
There is some difficulty in making an exact comparison between 
the two species, because Perrier’s figure (pi. xv. fig. 28) does not 
agree with his description. In the figure referred to there are but 
four thickened mesenteries, which seem to correspond exactly in 
their arrangement to the mesenteries of the Australian species. 
There seems, however, to be a slight difference in position ; the 
last thick mesentery in my species forms the posterior margin of 
segment 10, if the commencement of the clitellum has been rightly 
referred by me to the 12th segment. It is, however, not an easy 
matter to differentiate the two or three anterior segments of the 
body ; and, as Perrier had living specimens at his disposal, it is 
probable that his enumeration of the segments is more correct than 
mine. In this case the clitellum in my species begins a segment 
later than in his. 
Integument. — Perrier’s memoir contains a detailed account of the 
structure of the integument (pp. 382-400), illustrated by numerous 
figures. I cannot, however, altogether reconcile his description and 
figures, in so far as they refer to the structure of the epidermis, 
with the appearances presented by my own sections. 
In fig. 1 Perrier gives a general view of the epidermis or surface 
view, in which it is seen to be marked out into polygonal areas, 
separated by a certain amount of interstitial matter ; some of these 
contain granular bodies (lettered a in his figure), while others are 
without them. Between the setae are certain very peculiar struc- 
tures ( g ), which appear in section to be contained in sac-like diver- 
ticula (fig. 3) of the chitinous cuticle. The bodies themselves are 
highly refractive ; these evidently correspond to similar structures 
described by Yejdovsky in Anachceta * 
In transverse sections through the integument of my specimens of 
* Monograph, d. Enchytr widen, p. 21 ; see also a paper by myself in Proc. 
P<,oy. Soc. Lond., 1885, p. 464. 
