174 Proceedings of Royal Society of Edinburgh, [april 4, 
absent in segments 10 and 11 in his species ; if this difference is 
not really due to difference of age, it is clearly of great importance 
as a distinctive character. 
The arrangement of the nephridia is apparently very like what 
has been described in P. australis and P. coxii , particularly in 
the latter species, Fletcher’s description is as follows : — “ The seg- 
mental organs consist of tufted glandular masses, which are large, 
stalked, and dendriform in some of the most anterior segments, but 
smaller and inconspicuous elsewhere.” I found these structures very 
conspicuous indeed, and in the 14th and a few succeeding seg- 
ments they have a very strong superficial resemblance to the ovaries, 
with which organs their position almost exactly corresponds. 
The most characteristic point of difference between my species 
and the other two is the number and position of the genital papillae ; 
a comparison of my description with that given by Mr Fletcher of 
P. australis and P. coxii will show that the species differ greatly 
in this respect. Mr Fletcher like myself appears to have examined 
a considerable number of specimens. 
Pericliceta upoluensis, n. sp. 
This species of Pericliceta , like the last, is mainly characterised by 
the number and arrangement of the genital papillae. It is a native 
of the island of Upolu, in the South Pacific ; I am indebted to Mr 
R. Damon, of Weymouth, for the opportunity of examining three 
specimens. 
It is an average-sized species, measuring 5 or 6 inches in length. 
The apertures of the spermathecae are between 7-8 and 8-9. 
The single aperture of the oviduct is upon segment 14. 
The pores of the vasa deferentia are upon segment 18. Each 
pore is surrounded by a circular area of integument which is marked 
off from the rest. 
The clitellum consists of only two segments, JSfos. 14 and 15. 
The genital papillae are very small, compared, for example, with 
those of the last species ; they occur in the neighbourhood of the 
spermathecae as well as of the male generative apertures. 
There is a single papillae on segment 9, situated in the median 
ventral line and anteriorly to the row of setae. The rest of the 
genital papillae (so far as my specimens enable me to speak positively) 
