VASCULAR SYSTEM OF PHERETIMA 369 
3. THE BLoop-sysTtEM IN THE First FouRTEEN SEGMENTS. 
In the first fourteen segments the blood-system is highly 
modified on account of the cephalization of this region, and 
differs a good deal from the system in the general body-region. 
Amongst the longitudinal trunks the subneural as such is 
TEXT-FIG. 4°A. 
eff.v.c. aff.v.c. 
int. Ic. 
aff.v.c. 
eff.v.c. 
Disposition of blood-capillaries in the body-wall from a whole 
mount of a portion of the body-wall treated with caustic potash, 
showing how a ‘ venous’ capillary passes into an ‘ arterial’ one. 
aff.v.c.=capillary of the afferent vessel ; eff.v.c.=capillary of the 
efferent vessel; dnt.d.c.=capillary loop connecting the afferent 
and efferent vessels. 
