402 
EDWIN S. GOODRICH. 
(fig. 36). In the male this ciliated groove is interrupted on 
the seventh segment by the median genital pore (figs. 10, 20, 
24). 
An incomplete ring of cilia runs up from below on to the 
dorsal surface of the prostomium between the lateral tentacles 
and the eyes (fig. 2). As in Dinophilus, there is a gap between 
the two halves on the top of the head. Similar but more exten- 
sive incomplete rings of cilia are seen behind each parapodium, 
from the second to the eighth inclusive (fig. 1). These cili- 
ated rings appear to vary considerably in their development ; 
in some specimens they are certainly complete dorsallv on the 
segments behind the second, and they often are continued 
ventrally so as to join the longitudinal ciliated tract. Behind 
the ninth pair of parapodia the ring of cilia surrounding the 
anus is complete (fig. 5). Half-way between each successive 
pair of parapodia, from the first to the last, is situated on the 
side of the body a little patch consisting of some five or six 
rows of ciliated cells on a thickening of the epidermis (figs. 
1, 8, 27 scp.) Possibly it represents a segmental sense-organ; 
but I have no positive evidence of its sensory nature. These 
patches were first described by de Quatref'ages as “ mamelons 
cilies” (16), and mistaken by Claparede (3) for the nephridio- 
pores. 
The nephridial and genital openings will be described later. 
The Epidermis, Nervous System, and Sense-Organs. 
A very delicate cuticle covers the whole surface of the 
worm. Under it lies the epidermis, usually thin, but thick- 
ened here and therein special regions. Large gland-cells are 
found on the prostomium, and also gathered together on the 
ventral surface of the body, forming bulging masses project- 
ing far into the coelom at the base of the parapodia (figs. 18, 
25 gl.) Gland-cells are also present, as already mentioned, 
on the ventral surface of the pygidium, and extend in dimi- 
nishing numbers up the ciliated groove (fig. 7). Befringent 
granules occur dispersed in the epidermis, particularly on the 
