56 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
5. Section 254, nervous system, sense organs, &c. 
6. Section 257, part of the centre, showing nervous 
system, &c., highly magnified (X 600). 
7. Section 266, showing anterior end of nervous 
system, oral glands, &c. 
8. Dorsal part of last section more highly magnified 
(X 600). 
o Diagrammatic reconstruction of the animal from 
the sections, seen from the right hand side, 
showing the extent of the thickened ectoderm 
and test dorsally and ventrally, the course of 
the nerve cord, and the shapes, sizes and 
relative positions of the other organs, about 60 
times natural size. | 
Post-script.—March 1;—-Mr. W. Garstang, who was 
present when this paper was read, has kindly 
written to me since stating that in some sections 
of Otkopleura (? dioica) which he has made the 
endostyle is an open canal in the greater part of 
its extent. On the other hand Dr. Bousfield has 
very kindly sent me three additional series of 
sections of the same species of Ovkoplewra as 
before (? flabellum), and in these I find as in the 
one described above that the cavity of the endo- 
style is shut off from the pharynx above for 
more than half ofits length. The actual numbers 
of sections involved in these new series are :— 
I. closed posterior 7 sects., open 14, closed anterior 12. 
sug 
it: 
” 6 ” 14, ” ie 
as iy) 
