LOXOSOMA LOXALINA AXD LOXOSOMA SALTANS. 121 
Hu a than is usual, the alimentary canal is longer, and the 
lower or proximal part of the stomach is more distinct and 
forms a triangular or conical-shaped chamber. There are 
well-marked lateral swellings which form the glandular 
portion of the alimentary system (fig. 1, Id. pd.\. 
The mouth is bounded posteriorly by an epistome and 
anteriorly by the edge of the lophophore, which in the middle 
line is raised up into a little knob which in L. saltans bears 
stiff hairs. The mouth leads into a wide funnel-shaped 
chamber quickly narrowing into an CESophagus lined by long 
cilia. The cells which form the walls of the CESophagus 
contain a dark olive-green pigment lying deep in the cells 
and which occurs nowhere else in the animal. 
There are really two pairs of diverticula from the alinicn- 
tary canal, an anterior or proximal pair, though actually lying- 
nearer the foot than the lophophore region, and strictly 
lateral, and a posterior or distal pair less sharply constricted 
and lying rather more towards the ventral surface. Fig. 1 
of L. loxalina and figs. 10, 20 of L. saltans illustiate 
this well enough. 
The alimentary tract is ciliated over a great part of its 
surface, though in certain regions the cilia are longer than in 
others. The whole of the oesophagus bears long cilia, the 
lower chamber of the stomach is lined with short cilia, while 
the diverticula are devoid of them. The intestine is ciliated 
throughout by short cilia. The character of the cells forming 
the walls of the alimentary canal seem to be similar in the two 
species, L. loxalinaand L. saltans, and some further details 
are given in the next section. 
I shall not dwell upon the histological details of L. 
lo X al i na , as although I have over a hundred specimens of this 
species, they were all obtained from the tube of a single 
worm, and were preserved alike in Perenyi fluid, which is not 
a suitable reagent for fixing this animal’s tissues. In fact 
the specimens were not discovered until some time after 
preservation in the bottle containing the sand tube and por- 
tions of the Maldanid worm. I have not succeeded incoming 
