Lastly, towards the caudal region the right and left strands approach and anastomose, eventually coalescing in the mid line.
A complex network, however, does occur in Lybiodrilus and certain other Eudrilidae, where the paired nephridia possess ducts leading to the exterior which ramify and anastomose on the thickness of the body wall.
22 and 28); it gives off a branch to each tentacle, and these all anastomose at the base of the tentacles with the second nerve of the arm, the so-called secondary arm-nerve.
The branching processes of these cells apparently anastomose with one another and form a delicate supporting network.
The change in the character of the vegetation was con which have generally been regarded as the fronds of ferns characterized by a central midrib giving off lateral veins which repeatedly anastomose and form a network, like that in the leaves of Antrophyum, an existing member of the Polypodiaceae.
To adopt a figure, it is probable that the sources from which the two streams of life - animal and vegetable - spring may not be separable by a well-defined watershed at all, but consist of a great level upland, in which the waterways anastomose.