166 Proceedings of Boyal Society of Edinburgh, [april 4, 
ZJrochceta, I have met with, these peculiar structures in abund- 
ance. They stain very deeply in borax carmine, hut have the 
appearance of being formed of some resistant substance, being fre- 
quently indented; they lie at the base of the epidermic cells, just in 
the position in which Perrier has figured them ( loc . cit ., pi. xii. 
fig. 2 g). There is, however, this difference, that whereas in U. 
corethrurus they almost invariably form a regular line between the 
several setae of a segment, being but rarely disposed irregularly, 
in my species the contrary is the case; they are very frequently 
irregular in size as well as position, though they form always a 
continuous row between the setae, and are not, as far as my ex- 
perience goes, found elsewhere. Perrier is quite right in stating 
that the polygonal areas in his figure correspond to cells, but has 
overlooked the fact (which was not known at the time when he 
wrote) that the u interstitial ” substance is also cellular, and consists 
of elongated narrow cells, the polygonal spaces being occupied by 
large glandular cells with granular contents which do not stain, 
[n fig. 2, pi. xii. of Perrier’s memoir, a transverse section through 
the epidermis is figured, which does not at all represent the appear- 
ances presented by my sections. In Perrier’s figure are represented 
a series of columnar granular cells, among which are a few peculiar 
rod-like bodies; these latter I am unable to identify in my prepara- 
tions, unless, indeed, they correspond to the columnar hypodermic 
cells. The columnar granular cells appear to be a very inaccurate 
representation of the large glandular cells, which appear to be 
much more numerous in Urochceta than in Lumbricus. Judging 
by other earthworms, it does not appear to be at all likely that M. 
Perrier’s fig. 2 illustrates a real difference in the structure of the 
epidermis from my species. 
I have frequently noticed, on a superficial view of the epidermic, 
irregularly shaped refractive bodies, like those figured by Perrier 
and lettered a in his figure (pi. xii. fig. 1), within the glandular 
cells. 
Excretory Organs. — My species of TJrochceta possesses, like U. 
corethrurus , a pair of large glands in the anterior segments 
of the body, which have been termed by Perrier “glandes k 
mucosite.” These glands open on to the exterior of the body 
through a long duct with muscular walls. With regard to 
