NOTES ON OLIGOCHMTES. 55 
five such ciliated regions in each nephridium.' Their essential 
similarity to the ‘ciliated ampullz ” found in the nephridium 
of Vermiculus (8) scarcely needs pointing out. From the 
second region the canal passes to a third, where the lumen is 
often wider still, and is entirely devoid of cilia. The course of 
this, the terminal region of the canal, lies along the postero- 
dorsal edge of the main body, and from thence passes through 
the posterior limb to the external pore. It will be noticed that 
the blind sacculations of the canal (mentioned by Michaelsen, 
9a) are here very large (fig. 2, d/. b7.), and frequently a sub- 
division of the lumen takes place, forming a more or less com- 
plicated network (figs. 2 and 7), which must not, however, be 
confused with the supposed anastomosing branches between 
the different regions of the canal. Finally the lumen 
expands to form a vesicle (e. v.), which opens to the exterior 
by a small transversely elongated pore in front of the ventral 
chete. 
Sections only confirm these observations. No limits are 
distinguishable between the cells. The funnel has two nuclei 
in its upper lip near the point of insertion of the cilia (fig. 3), 
and one at the base. Small deeply staining nuclei are seen 
in the main body (n., fig. 3), and larger nuclei are distributed 
apparently in more intimate connection with the second and 
third region of the nephridial canal (n., fig. 6). 
On the Celomic Corpuscles of Enchytrzus 
hortensis. 
Most characteristic of this worm are the celomic corpuscles ; 
these are of three kinds. Floating in the ccelomic fluid, or 
creeping on the surfaces exposed to it, may be seen a small 
number of ameeboid corpuscles of very variable character. 
Some (fig. 28, a.) are more or less spherical with short- pointed 
processes ; their protoplasm is pretty clear, and contains, as a 
rule, a few highly refringent round granules, apparently of a 
1 M. Bolsius (4) justly criticises previous authors for describing the canal 
as ciliated, and yet not figuring any cilia. M. Roule (10) alone does so, and 
represents them erroneously along the entire length of the canal. 
