480 
F. A. POTTS. 
nerve-cord forms a prouiiiieut ganglioiij and at this point it 
gives off two distinct nerves, one of which can be traced 
along its wliole course into the dorsalmost stolon. From this 
ganglion a continuation of the ventral nerve-cord penetrates 
the genital appendage of the stock, but after the first few 
segments it becomes almost indistinguishable. 
The continuity of the muscles of stock and stolons is even 
more easily traced. Johnson states that budding of stolons 
takes place “ from a mass of undifferentiated tissue, traversed 
by muscle-fibres which are continuous with the longitudinal 
muscle-bands of the buds.” Text-fig. 4 represents another 
longitudinal vertical seciion through VIII of the Victoria 
individuals. On reaching the region of proliferation the 
longitudinal muscles of the stock are seen to give off a thick 
bundle of fibres wliich turns off almost at i-ight angles, 
traverses the mesoblast of the cushion, splitting up into 
smaller bundles which approach the developing stolons. The 
dorsalmost stolons are supplied by muscle-bundles coming off 
separately frotn a continuation of the ventral longitudinal 
musculature which enters the genital appendage of the 
stock. 
It will be noticed that in nearly all the sections a great 
many of the muscle-fibres, instead of running in the vertical 
plane of the section, are gathered into one or two transverse 
bundles [tr. m.), and so are parallel to the direction of the 
rows of stolons. Transversely arranged fibres also occupy 
the folds between stolons just under the ectoderm, and it may 
be noticed, too, that a couple of muscle bundles often enter 
each stolon, each apparently forming the entire musculature 
of one side. 
We find on examination of T. crosslandi, (1) represented 
in Text-fig. 2, that this l epresentative of an earlier stage of 
proliferation shows a cushion consisting of connective-tissue 
fibres only. The ventral nerve-cord of the stock ends bluntly 
Avhen just penetrating the new tissue. Muscle-fibres seem to 
be entirely absent. We are thus able to say that the ingrowth 
of the nervous and muscular systems does not begin till the 
