366 KARM NARAYAN BAHL 
in the other earthworms) and the * intestino-tegumentary ’ of 
Megascolex. The probable homologies are set out in the 
following table : 
1. Lumbricus | Branche tégumen- | Branche dorso-sous-| Absent 
taire nervienne 
2. Moniligaster | Pr a a * a 
3. Megascolex Dorso - tegumen -| Only partially re- | Intestinal 
tary presented by the} part of 
tegumentary part | intestino- 
of the ‘ intestino- | tegumen- 
tegumentary ° tary” 
4, Pheretima One of the capil-|Commissural ves- | Septo-intes- 
laries from the| sel tinal, 
body-wall joining 
the dorsal por- 
tion of the com- 
missural 
In deseribing the ‘ventro-intestinals’, of which there is 
a pair in each segment in Moniligaster (2, 1894, p. 380), 
Bourne remarks: ‘ They are the sole afferent vessels of the 
intestinal walls. There are no such vessels in Megascolex 
coeruleus, their function being performed by the “ intes- 
tino-tegumentary ”’ vessels... In Pheretima we have both 
the ‘intestino-tegumentary ’ (represented by the septo- 
intestinal) as well as the ventro-intestinal vessel in each 
segment ; and if both are afferent vessels of the gut-wall, as 
I believe they are, there is a double source of supply of blood 
to the gut in Pheretima. 
As I shall discuss later on, I believe that the course of blood 
in the commissural is towards the dorsal vessel. The blood 
from the subneural goes to the intestinal plexus through the 
septo-intestinal, and the branches joining the commissural all 
along its course bring blood into it from the body-wall and the 
septal and integumentary nephridia. 
2.The Integumentary Vessels.—The body-wall, 
consisting of its muscular layers, and the epidermis receives its 
supply of blood from the ventro-tegumentary branches, a pair 
of which comes off from the ventral vessel in each segment. 
I have already stated that these ventro-tegumentary branches 
