22 Annelida CTwetopoda 
ering of pigment, interrupted by a narrow clear baud in 
the anterior part of the 4th segment. 
Body convex above, segmentation vrell marked. A few 
of the anterior segments taper slightly. The body attains 
its greatest width at the 7th segment, remaining unchanged 
to the last 8 segments, whence it tapers quite rapidly. 
Anal segment narrow, without appendages save the anal 
cirri. 
Small fusiform papillae are scattered irregularly between 
the feet, and at their bases, much more numerously in the 
middle of the body than at either end. 
Setae, very short and of three kinds, two of which are 
compound. One form has a stout basal article (f. 47), a 
little longer than the appendix ; there are 3 to 5 of these in 
each bundle. The second form (f 46), longer than the first, 
has the appendix iongate, delicate, a little longer than the 
stem, one or two to each foot; in both, the edge of the ap- 
pendix is beset with short, stift' hairs. Of the simple setae 
(f..48) there is usually but one, sometimes two to each foot. 
Length, 3. S""""; greatest diameter, 0.25""'. Number of 
segments, 33. 
A single specimen ; not recognized when collected, but 
found afterwards in perfect condition in a lot of P^do- 
PHYLAX. 
In ma!iy respects this species is similar to aS^. pirifera 
Clpd. (Ann. de Naples^ p. 516, pi. xiv, f. 2), but differs 
from it in the shape of the head, in the free terminal part 
of the palpi, in the position of the eyes, and in the form of 
the antennae and cirri. 
I have referred this species to Sph^kosyllis, though 
somewhat in doubt as to whether the name can be retained 
for it. Claparede's original diagnosis of the genus was 
defective and his figures misleading. Ehlers would seem 
to have been perfectly justified in ascribing to the genus five 
