42 Proceedings of the Royal Physical Society. 
genus, very much smaller than the sete on either side of 
them. In the last five or six segments of the body there 
were only a pair of sete to each bundle. As many as six 
setze in a bundle were only found ‘in the anterior region of 
the body (the first twenty segments or so) in both bundles ; 
farther back the number of setze was almost constantly four 
in the lateral bundles, and the innermost pair were not 
markedly different in size from the others as they are 
anteriorly. The absolute size also, particularly as regards 
thickness, was greater in the case of the setz borne by the 
last few segments of the body than in the case of those 
borne by the first few segments. | 
The clitellwm is completely developed all round the body. 
It is not saddle-shaped. As is generally the case (subject to 
a few exceptions) in this family of Oligocheta, it has one 
set of setz only, those belonging to the xiith segment. 
The clitellum also includes a portion of the xith segment. 
The first dorsal pore lies, as appears to be invariably the 
case with the species of the genus /ridericia, between seg- 
ments vii./viii, The dorsal pores were sometimes rendered 
very conspicuous by the extrusion of various bodies from 
the ccelom by the effects of the corrosive sublimate used in 
the preserving of the worms. These had frequently remained 
half inside and half outside the pore. In one case a ripe 
ovum was partially extruded; this fact is possibly of some 
interest in relation to oviposition. There is evidently no 
reason against the possibility of the ova being normally 
evacuated through the dorsal pores. The probability of this 
being a normal occurrence is increased by the fact that the 
ova are not always confined to the x1ith segment, which 
contains the gonad. 
The salivary glands have a wide main stem, which opens 
into the cesophagus a little way behind the pharynx. This 
gives off a few branches dorsally and ventrally, one of 
which runs forward. The branches themselves do not 
appear to undergo secondary ramifications. The intestine 
commences in segment xiv. 
The septal glands .extend back-as far as the viith segment, 
and commence in the ivth. The ante-septal region of the 
