No. 2.] A NEW MARINE TRICLAD. 175 
must be, would, of course, be very difficult to resolve in speci- 
mens killed just after the momentary supply of mucus had 
been exhausted. In Syucelidium it is no difficult task to 
trace the irregular slime-ducts, or at any rate the “trainées de 
mucosité,” to the spaces between the polygonal areas of the 
ciliated membrane. I believe the little widenings occurring 
at intervals in these spaces are the openings of the ducts. 
I cannot, therefore, agree with Chichkoff, and must hold 
to the views of Lang, Iijima and Woodworth, though I am 
not prepared to agree with the last mentioned observer in 
homologizing the slime-glands with the “ Stabchenstrassen ” 
of the Rhabdocceles. 
4. Digestive Tract. 
The pharynx does not differ in its form or function from 
that of other Triclads so far as I can observe. It is a thick- 
walled muscular tube (Fig. 10 f%) contained in a special 
chamber and opening into the trifid gut. 
The gut, or intestine, deviates somewhat from the Triclad 
type (Figs. 3 and 4coe). The unpaired anteriorly directed 
ramus does not extend up to the brain, much less beyond it as 
in Gunda and Phagocata. Its lateral diverticula are few in 
number (five to seven on a side) compared with such forms as 
Dendrocelum lacteum or even Ldelloura candida. The diver- 
ticula show little tendency to subdivide, except at their tips, 
where they are sometimes bi- or even trifurcate. The two 
posterior gut-rami pass back, one on either side of the pharyn- 
geal chamber, and give off a few stunted diverticula, which 
have even a less tendency to subdivide than the diverticula of 
the anterior ramus. Behind the genital atrium the two rami 
converge and fuse. From their point of union an unpaired 
stem with a few diverticula on either side extends posteriorly a 
short distance. The diverticula usually alternate so that the 
stem has a zigzag appearance. 
This curious fusion of the posterior rami is constant in all 
the specimens of Syxcelidium which I have examined (about 
75 in number) with two exceptions. These were just hatched 
young (.5-.6 mm. long). One of these (Fig. 1) shows the 
