MONILIGASTER GRANDIS, A.G. B. 313 
strictly columnar in shape. Those cells which are packed be- 
tween the goblet-cells are—at any rate when the goblet-cells 
are full of secretion—much pressed out of shape. In many of 
my sections the goblet-cells are extremely distended, but they 
never dip down below the ordinary epidermic layer. The 
nucleus is pushed right down to the base of the cell. The 
secretion does not become stained on treatment with alum 
carmine. These cells correspond apparently to the finely 
granulated cells of Lumbricus,! and they are the only gland- 
cells present, there being no cells in a non-clitellar segment 
corresponding to the coarsely granulated cells of Lumbricus. 
I have recognised these two kinds of gland-cells in a good 
many genera, including Lumbricus, but it is very clear that 
only one kind is present in M. grandis, or, I believe, any 
Moniligaster. 
The clitellum, as stated above, develops upon Segments x, x1, 
x11, and x11, but not upon the whole of Segments x, x1, and 
x11, so that in the clitellar region we have to distinguish 
between clitellar epidermis and non-clitellar epidermis, and 
there is further a difference between the epidermis in the 
neighbourhood of the genital apertures and the rest of the 
non-clitellar epidermis. 
In the clitellar epidermis (fig. 19) ordinary epidermic-cells 
and goblet-cells occur, and in addition to these the two other 
kinds of gland-cells mentioned above. The ordinary cells and 
the goblet-cells form a surface layer through which pass the 
necks of the other gland-cells. The main portions of what I 
have called above the short club-shaped cells form a distinct 
layer of more than twice the thickness of the superficial layer. 
These short club-shaped cells (figs. 19, s. cl.) are filled with 
large granules which stain deeply with alum carmine, and 
correspond, I believe, to the coarsely granulated cells of Lum- 
bricus. The innermost layer of the clitellum, a layer which 
is thicker than the other two layers together, is made up 
of the main portions of the long club-shaped cells (fig. 19, 
1. cl.), so that some of these, the ones that dip furthest down, 
Cf. Cerfontaine, ‘Arch, de Biologie,’ t. x, 1890, 
