60 Journal of Entomology and Zoology 
nervous system. In detail the structures are quite different from those of echinoderms 
where the strands from cells in most cases seem to be almost the only processes in the 
fiber areas. In Dolichoglossus there are not such long slanting fibers from single cells 
as in echinoderms and conduction seems possible chiefly through the small and appar- 
ently short lateral branches of the long nerve cells. Possibly the branched inner ends 
of the cells furnish some means of conduction. These last resemble similar structures 
in certain echinoderms. The fine lateral branches and the absence of crossing lateral 
fibers seems to show a slightly more advanced type of structure than we find in the 
starfish group. In the central part of the nervous system, that is the dorsal nerve of 
the collar, longitudinal fibers are more evident than in other parts. 
No distinction between fiber and fibril could be seen. The larger strands did not 
seem to be made up of smaller ones and the smaller ones seemed to be processes of 
larger ones. 
REFERENCES 
Bateson, W. 1886 
Morphology of Enteropneusta. Quart. jour. mic. sc. vol. xxvi. 
Delage et Herouard 1898 
Trait d’ zool. concrete. Les Protocordes. Paris. 
Kowvalevsky, A. 1866 
Anatomie des Balanoglossus. Mem. Imp. Ac. St. Petersb. 7e ser. vol. x. 
Shipley, A. BE. 1893 
Zoology of the Invertebrata. 
EXPLANATION OF FIGURES 
Fig. 1. Longitudinal section of part of the proboscis, the collar and part of the 
body of Dolichoglossus. The dorsal side is at the left. The nervous system is shown 
by heavy lines. X35. 
Fig. 2. Cross section of the proboscis showing the position of the nervous system 
as a heavy line. X35. 
Figs. 3 and 4. Sections of parts of dorsal and veatral nerve trunks. The out- 
side is down. X300. 
Fig. 5. Section through epithelium and nerve strand showing epithelial and 
nerve cells. X450. 
