14 E. RAY LANKESTER, ON THE 
and the spermatic reservoirs, the apertures of the ducts may 
be described. An excellent drawing of these is given by 
Hering, from a specimen of the epidermis of the worm, which 
he obtained by maceration (Pl. IJ fig. 6). The observations 
may readily be repeated, if spirit be used first to harden the 
cuticle. Two series of double apertures are then seen on 
either of the median line belonging to the sete. Between the 
9th and 10th ring, and 10th and 11th, the apertures of 
the spermatic reservoirs are observed. In the 14th seg- 
ment between the two series, on either side, is the aperture 
of the oviduct, and in the fifteenth segment, in connection 
with a large, well-marked development of the integument on 
either side, is the aperture of the vas deferens. No apertures 
to the ciliated canals can be detected, which, however, exist 
nearer the median line than any of the pores drawn. It will 
be observed with regard to the apertures of the seminal reser- 
voirs, vasa deferentia, and oviducts, that they all exist in a line 
between the exterior and interior, or lateral and ventral series 
of sete, whilst, as before stated, the apertures of the ciliated 
canals are between the two ventral series of sete. 
In addition to the pores just mentioned, an exterior organ 
of generation is found in the cingulum, a glandular mass sur- 
rounding the segments from the 29th to the 36th inclusive. 
Its structure has been before alluded to in connection with 
the tegumentary system; a portion is figured, highly mag- 
nified (Pl. IT, fig. 4), showing the papille; and the whole 
organ is shown in Pl. IT, fig. 7. 
Capsulo-genous Glands.—Besides the regular glands deve- 
loped on the parietes of the body, the earthworm exhibits 
numerous glands, destined in all probability to form the egg- 
capsule, in which both zoosperms from the spermatic reser- 
voirs and ova are deposited. ‘These glands were first detected 
by M. D’Udekem, who figures them in his beautiful and 
elaborate paper. They are merely an excessive development 
of the setigerous glands of the ventral or inner series, occur- 
ring in the 9th, 10th, 11th, 12th, and 18th rings of the body. 
The white colour and thick fleshy look which is sometimes 
observed about the exterior of these segments is due to the 
development of the capsulo-genous glands. Whether the 
capsulo-genous glands have everything or anything to do with 
the formation of the egg-capsule is very difficult to determine ; 
but the supposition of M. D’Udekem is so plausible, and 
comes from so good an authority, that it cannot but be re- 
ceived until absolutely disproved. The secretion of the 
capsulo-genous glands is a thick glairy liquid, containing 
