216 Mr. F. E. Beddard on 
China, it may be regarded as merely a local variation. The 
stout mesenteries, the existence of which Perrier has men- 
tioned in this species, are developed between segments 4-5, 
5-6, 6-7, 7-8; they are connected with each other by tendi- 
nous cords, and thus form a very compact whole, which is no 
doubt of assistance to the animal in helping it to force its way 
through the earth. 
Hab. Neighbourhood of Calcutta. 
Pericheta armata, n. sp. (Pl. VIII. figs. 5-7.) 
This new species I include within the genus Pericheta for 
the reasons just stated. 
It is characterized by the sete being absent from a narrow 
area upon the ventral median line and by the possession of a 
clitellum consisting of four segments, commencing with the 
14th, but extending as far as the 17th segment; the male 
generative apertures are upon the first segment after the cli- 
tellum (18th segment of body). 
The anterior portion of the body is slightly swollen, some- 
what in the shape of an olive. ‘There are about forty seta to 
each segment, at any rate in those anterior to the clitellum; the 
posterior segments seem to have fewer sete, twenty to thirty. 
Setz are found upon the clitellum, and are distributed upon its 
segments just as they are over the rest of the body. One of 
the sete is shown in fig. 5; the proximal end is rounded and 
somewhat swollen, the distal end sharply curved. 
The alimentary canal entirely resembles that of other Pert- 
chete. There are found in this species the glandular tufts 
which Perrier* was the first to describe in P. Houlleti and other 
varieties as salivary glands; but subsequently + considered to 
be representative of the segmental organs of other earth- 
worms {. In one specimen of P. armata which I dissected there 
were no less than nine pairs of these organs occupying seg- 
ments 5-13. 
There are eight pairs of contractile hearts occupying seg- 
ments 6-13, of which the four posterior are the largest. 
The three pairs of spermathece are situated in segments 
7, 8, and 9, but open on to the boundary-line between each 
of these segments and the one in front. ‘The spermathece 
are unusually large; each is provided (fig. 7) with two 
* Perrier, Nouv. Arch. du Muséum, t. vii. 
+ Perrier, ‘ Comptes Rendus,’ t. Ixxvii. (1874) p. 814. 
{ Horst (Niederland. Archiv f. Zool. Bd. viii, 1879, and ‘ Notes from 
the Leyden Museum,’ vol. vy.) subsequently, but independently, arrived at 
a similar conclusion. 
