362 KARM NARAYAN BAHL 
intestinal wall about 4mm. from their origin and go round 
the wall of the gut to its ventral side. I propose to apply the 
term dorso-intestinal to the vessel from its point of 
origin from the dorsal to the point of its entrance into the 
intestinal wall. The continuation of the dorso-intestinal 
on the wall of the gut I propose to call a transverse 
channel.’ Corresponding to the two pairs of dorso-intes- 
tinals there are two pairs of transverse channels in each 
segment ; each of these transverse channels is joined at its 
point of junction with the dorso-intestinal by a branch from 
the typhlosolar vessel (vide infra) (fig. 2, left half): so that 
these transverse channels serve to connect not only the longitu- 
dinal capillaries with each other but also the whole plexus 
with the typhlosolar vessel. 
(c) Oblique Channels.—These begin at the mid-ventral 
line of the intestine at the intersegmental plane and run 
forwards and dorsalwards, passing through three segments 
before reaching the mid-dorsal line, where they join the 
typhlosolar just in front of the septa (fig. 3). 
(d) Typhlosolar Vessel.—The typhlosolar vessel runs 
along the free edge of the typhlosole all down the second region 
of the gut (fig. 2). The typhlosole itself cannot be compared 
to the structure of the same name in Lumbricus, for in 
Pheretima it is really a bigger fold of the gut-epitheium 
containing not yellow cells, like those which fill up the typhlo- 
sole of Lumbricus, but only connective tissue which has 
the same staining qualities as the connective-tissue matrix 
in the layer of circular muscle-fibres of the body-wall. The 
typhlosolar vessel does not seem to possess a definite wall like 
the capillaries of the external plexus in Pheretima or 
the typhlosolar vessel of Lumbricus, but is only a part 
of the blood-sinus like the longitudinal capillaries, being, like 
them, in communication with the two pairs of transverse 
channels in each segment. We can therefore think of these 
transverse channels as circular ring-vessels which collect blood 
' T have called these channels as they are thicker than the longitudinal 
capillaries, 
