JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE IX, 



Illustrating Mr. Ray Lankester's remarks on Opalina, 

 and Pachydermon. 



The figures are very variously maguified. 



Fig. 

 1. — Opalina Naidos, as seen when living. 



2. — Another specimen with post-mortem changes, c, cavity between 

 nucleus and parenchyma ; n, nucleus ; g, granular layer ; y, dis- 

 tended and elongated vesicle. 



3. — Weak acetic acid added so as to bring out the nucleus and ils coarsely 

 granular structure. 



4. — A specimen with large vesicle ; living. 



5. — A specimen with vesicles on both sides of the body. 



6. — a, h, c, d, e, expansion; e,f, g, h, contraction, of a vesicle. 



7. — Transverse fission of 0. Naidos. 



8. — A living specimen deformed by pressure in its host's body. 



9. — Bursaria Rananim, Ehrenberg. 



10. — Spermatophor {Pachydermon, Claparede) of Limnodrilus Claparedu. 

 This should be at least four diameters larger if drawn to the same 

 scale as fig. 1, 



]1. — A part of one of the long coiling spermatophors of Nais serpentina. 

 This figure is on the same scale as fig. 1, but represents only a small 

 bit of the long spermatophor. 



12. — A portion of the same more highly magnified. 



