ON KYNOTUS CINGULATUS. 453 
or penial cheetze may be associated directly or indirectly with 
the various organs, and aid materially in holding the two 
worms together during copulation. 
To return to Kynotus, the second of my three specimens 
indicates the manner in which this clasper is protruded, for 
here the organ is protruded to just half of its extent (fig. 4, 5). 
The first portion to make its appearance on protrusion is 
the hinder border (fig. 4, 7), and in this case the dorsal or 
outer surface is strongly curved so as to be much more con- 
cave than when fully protruded (see fig. 5). 
I was unable to observe the oviducal or the spermathecal 
pores on external examination. 
The nephridiopores become visible only on the twenty- 
sixth and following rings; they exist anteriorly to this, but 
owing to the great amount of contraction of the body-wall 
they are invisible. They lie nearly midway between the couples 
of cheetze on each side, and are especially distinct on the cli- 
tellum (fig. 1, mp.). 
There are no dorsal pores. 
The Internal Anatomy.—The position of the eight thick 
septa (a—h) which exist in the present species is a most im- 
portant point to determine, and is not quite so easy as it would 
appear (fig. 6). The most anterior septum is quite thin, and 
lies behind the pharynx ; it is inserted between the fifth and 
sixth rings. 
The first thick septum, a, is inserted between rings 6/7. 
The thick septum 2 3 a sf ESI: 
> » 4 a so LOPS 
” ” d 22 »” ” 12/13. 
, tere the hinder 
3 % margin of 14th ring. 
“ Ce i . pet acaeolG ble 5, 
55 ed, vs in the 18th ,, 
= » A, somewhat thinner than the preceding 
seven, near the hinder margin of the 20th ring. 
The next, i. e. tenth septum, is inserted near the hinder 
margin of the 22nd ring. 
The eleventh, between 23/24 rings, 
