STUDIES ON HARTHWORMS. 277 
club shape with coloured granular contents as in Lumbricus 
(G. e:, via.) 
(g) The Rectum differs from the sacculated intestine chiefly 
in the absence of the typhlosole, and the absence of the coloured 
granules in celomic epithelium. 
The main points of difference then between the alimentary 
tract in Microcheta and in Lumbricus, is in the absence in the 
former of glands on the cesophagus (a very usual difference) ; 
the absence of a proventriculus ; the position of the gizzard in 
somite vi, instead of in somites xvi1, xviii, and in the presence 
of an intestinal gland. 
It is noteworthy that the septum immediately in front of 
the gizzard is very thin; similarly in Lumbricus, the septum 
between somites xvi and xvitt, occupied by the gizzard, is 
nearly deficient ; evidently this is related to the necessity or 
habit of moving the gizzard during feeding. 
The Genital Organs.—The genital organs were all well 
developed in the two worms opened, and are formed in the same 
type as in Lumbricus; and, as in that form, there is no penis, 
or prostate. The most interesting organs are the spermathece, 
both in their position, their number, and their small size. (PI. 
XV, fig. 4.) 
The genital organs consist of the following : 
A. Male: (a) Seminal reservoirs; (4) testis; (c) sperm 
ducts and ciliated rosettes. 
B. Female: (a) Ovaries; (6) spermathece. 
c. Certain structures of unknown functions in somite x1, 
which, being in the genital region, I shall describe 
here, though whether they have or have not any 
relation to the generative organs, I do not know. 
A. Male Organs.—a. The seminal reservoirs, or “ tes- 
ticular sacs’ (sem. res.), are four in number ; a pair of nearly 
spherical, light brownish sacs in somite x, and a pair in somite 
x1. They are placed, as usual, close to the intestine, which they 
partly overlap; but they are not so irregular as in Lumbricus, 
and are much firmer. In section (Pl. XVI, fig. 11) they are seen 
to be made up of trabecula of connective tissue, traversed by 
