30 The American Naturalist. [Jan 
may be said to be in the dorsal part of the brain, since the brain 
is not separated from the epidermis, but lies with its dorsal 
ganglion cells intermixed with the epithelial cells, in part at least. 
As far as the sections go, the appearance of the eye is- 
simple as to suggest that it may be interpreted as merely one 
two epidermal cells, with clear, refracting outer ends, and pigment 
in the middle part. The inner tips of such cells may be supposed 
to connect with the brain. It is to be noted, also, that the same 
sort of pigment granules occur here and there in neighboring 
epidermal cells in small collections or isolated. 
Posterior to the head are the two great tentacles, with a ciliat 
groove onthe under side; while below, on each side of the mo 
is a very prominent, glandular, lateral projection of considerable 
size. The pharynx is ciliated, and may be everted with defi 
ridges and grooves between the above two lateral lobes. 
At the posterior end of the body (Fig. 8) there is a pecu 
series of about fourteen papilla, placed about an elliptical 
within which the digestive tract terminates in a longitudinal s 
In the internal anatomy of this Annelid there is one fact 
considerable interest,—that is the dorsal opening of the excretory 
tubes, the nephridia. From the ciliated internal opening of each 
nephridium (Fig. 9) a somewhat coiled tube proceeds dorsally to 
make its way between the dorsal longitudinal muscle and the ad 
cent epidermis, and then, passing towards. the middle of the back, 
opens finally by a small ciliated orifice not fat from the median 
line and about mid-way from one end of the somite to the oth 
This is shown in a very diagrammatic way in the figure as mi 
out in several sections of preserved specimens. 
This dorsal position of the external nephridial openings is V 
unusual among Annelids, but is not confined to this species ! 
to those closely related to it. Thus, though the statement 
Ehlers concerning numerous dorsal openings in Polynoe seem 
have been negatived by the observations of Haswell, Bourne, 
Kaltenbach, and those described by Cosmovici in Sthenelais í 
Hermione may also need investigation, yet other cases 5ê 
surely established. Such are the single dorsal’ openings, an 
riorly, in certain Hermellida and Serpulacea, the dorsal openit 
