CONTRIBUTIONS TO THE ANATOMY OF EARTHWORMS. 469 
lately described by Bourne (14); this species, P. Stuarti, 
appears to possess two pairs of tubular atria, and therefore 
resembles Acanthodrilus very closely indeed. 
Pericheta intermedia is a moderately large species, 
being stout in proportion to its length; its general aspect is 
very different from that which is characteristic of Pericheta; 
the sete are not at all conspicuous, and the worm has asmooth, 
somewhat glandular appearance. This seems to be due to the 
absence of a ridge in the middle of each segment for the im- 
plantation of the sete. 
The buccal lobe does not divide the peristomial segment. 
The clitellum was not developed in either of my two 
specimens. 
The colour of the spirit preserved was of a reddish brown, 
paler ventrally. During life, according to Mr. W. W. Smith, 
from whom I received the specimen, the colour is “ bluish 
green.” 
The sete form a nearly complete ring round each segment, 
only failing for a short space in the mid-dorsal and mid-ventral 
lines. 
There are no dorsal pores. 
In the neighbourhood of the male genital pores are a number 
of papilla. 
The male genital pores are a pair of slit-like orifices on 
the eighteenth segment, on a line with the sete, which are 
almost absent in the space between the two orifices, there 
being apparently only one seta on the inner side of the pore. 
The oviducal pores are paired, and upon the fourteenth seg- 
ment; this is unusual, but is occasionally met with in the 
genus Pericheta. The common arrangement is a single 
median pore. 
The nephridiopores are quite obvious upon most of the 
segments and lateral in position. 
Alimentary Canal.—The gizzard is situated in the fifth 
segment; it is very small and the muscular walls not very 
thick. 
The csophagus is furnished with separate calciferous 
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