Dr. W. B. Benham on some Javan Perichetide. 45 
exceeds slightly the usual interval; however, the spaces 
between the chete of a circle are not of uniform extent. 
The first dorsal poreds behind the seventh segment ; that 
this is not a fixed point appears from the description of 
P. capensis given by Horst and by Ude, for the latter found 
it to vary from vil./vill. to xi./xi. 
The male pores are not carried by papille ; they are, how- 
ever, quite distinct, as transverse slits surrounded by crenate 
lips, rather sunk below the general surface. Hach pore is 
surrounded by a circular area—not a papilla—of slightly 
different structure and appearance from the -rest of the epi- 
dermis; this ring does not extend to the intersegmental 
furrows. Between the two pores there are eight chete; there 
are eight to twelve in Horst’s and Ude’s specimens of P. capen- 
sis. Horst describes the pore as being oblique and carried 
by a papilla; Ude states that it is ‘sickle-shaped,” and 
that one lip of the pore projects as a kind of operculum, as in 
Rosa’s P. operculata. 'This* difference should be borne in 
mind, for, as I have mentioned, I believe it depends on 
whether the penial duct is wholly or only partly retracted, so 
that it does not form an important point of distinction. 
The spermathecal pores are not very distinct; they are 
situated between segments vil./vill. and viii./ix., rather more 
laterally than the male pores. 
‘The oviducal pore is distinct, light-coloured (? white), and 
median. 
Internally the anatomy agrees very closely with the descrip- 
tions already given for P. capensis; but there are one or two 
points of difference, the relative importance of which is not 
altogether certain. ‘The septa 8/9, 9/10 are absent, and the 
izzard occupies the whole length of the space between septa 
7/8 and 10/11—that is to say, it occupies segments Vill., 1x., 
x.,—Wwhereas both Horst and Ude for P. capensis refer it to 
only the first two of these segments. Horst states that the 
septum 10/11 is absent; Ude finds it present. 
There is the usual pair of intestinal ceca in segment XXvVI. ; 
each has a length of three segments. 
The sperm-sacs lie in segments xi. and xil. 
The spermathece are in segments vil. and vili.; and it is 
here that the only real tangible difference exists between my 
specimen and those previously described, for both the above- 
named authors place these sacs in segments vill. and ix. 
But there is no mistake on my part; the first spermatheca is 
in front of the gizzard, the second lies alongside of it. Hach 
spermatheca has the characteristic shape already referred to, 
and already figured by Horst and by Ude tor P. capensis, 
