VASCULAR SYSTEM OF PHERETIMA 867 
supply the body-wall of the segment succeeding the one in 
which they arise from the ventral vessel (e.g. the ventro- 
tegumentary arising from the ventral in the fortieth segment 
runs along and supplies the body-wall of the forty-first segment 
and so on). The ventro-tegumentaries give off numerous 
branches backwards and forwards (fig. 1), which are distributed 
over the body-wall and also supply blood to the integumentary 
nephridia (vide infra). ‘The ventro-tegumentaries grow 
thinner and thinner along their course towards the mid-dorsal 
line near which they end in the body-wall. 
TRXT-FIG, 4, 
cir m. ep. long: m. 
A diagrammatic reconstruction of three serial sections showing 
the close parallelism of ‘ arterial’ and * venous’ capillaries in the 
body-wall, ep.=epidermis; cir.m.=layer of circular muscle- 
fibres; long.m.=layer of longitudinal muscle-fibres;  vt.b.= 
a branch of the ventro-tegumentary vessel ; comm.v.b,=a branch 
of the commissural vessel. 
The efferent vessels of the body-wall are the paired branches 
of the subneural in each segment and the numerous branches 
joining the commissural vessel in each segment. 
The afferent and efferent capillaries run side by side in the 
substance of the body-wall, and can always be followed from 
the coelomic epithelium through the muscular layers to the 
epidermis. I ean confirm for Pheretima Bourne's state- 
ment (2) with regard to the peripheral capillaries in Monili- 
gaster, that ‘the most striking feature of these networks 
(he is speaking of capillaries in the body-wall) 
