some Earthworms from India. 217 
minute supplementary sacs, one on either side close to its 
external opening. 
The prostate glands are large and very much lobulated ; 
they are placed in segment 18 ; each is composed of two large 
lobes, which are again divided up into a number of lobules ; 
the duct of the prostate gland unites with the vas deferens 
before its external opening on to the 18th segment. 
In the furrow between each of the two large lobes of which 
the gland is formed is a thin-walled sac containing a number 
of specially modified sets (fig. 6) ; the presence of this penial 
sac, found in the intraclitellian genus Hudrilus and the post- 
clitellian genus Acanthodrilus, has never before been described 
in any Pericheta or Megascolex. 
The testes are brownish in colour and not unlike the seg- 
mental tufts, and for this reason are somewhat difficult to make 
out; there appear to be only one pair, situated in the 12th 
segment. 
In the 9th segment, upon the mesentery bounding it behind, 
are a pair of glands which closely resemble the testes in exter- 
nal appearance. The specimens were not sufficiently well pre- 
served to admit of a proper microscopical examination ; so far 
as could be made out, the minute structure was not unlike that 
of the testes; and it is probable, from their position, that they 
are an anterior pair of testes, since the ovaries are in all other 
earthworms without exception placed behind the testes. 
flab. Neighbourhood ot Calcutta. 
Perionyx M‘Intoshii, n. sp. (Pl. VIII. figs. 3, 8.) 
The genus Perionyx was instituted by Perrier* for the 
reception of an earthworm which, although very closely 
allied to Megascolex, differs from it in at least three im- 
portant characters :—(1) in the position of the clitellum and 
the number of segments of which it is composed ; (2) the pre- 
sence of segmental organs like those found in other Oligo- 
cheta; and (3) in the arrangement of the male generative 
apertures. Only one species, Periony.c excavatus, 1s described 
by Perrier. 
Perionyx M'Intoshit measures 15 inches in length and about 
one third of an inch in breadth, and consists of some 200 seg- 
ments; its colour is violet, inclining to a reddish tint on 
segments 12-23; the clitellum was not developed. 
The sete are arranged in a continuous ring round each 
seoment, as in Megascolex, upon a somewhat darker-coloured 
line. 
* Perrier, Nouy. Arch. ete. doe cit. 
