JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE X. 

 Figures illustrating Dr. Busch on Noctiluca. 



Fig. 



1. — Noctiluca punctata, 'Qnsch (^miliar is, E. and G.). a, border turnerl 

 in at the liUus ; h, sharp boi'dered rod ; c, brown body (^nucleus, 

 Quatref.) ; d, proboscis ; f, brown corpuscles seen in the interior. 



2 and 3. — Germs of Noctilucce found in empty sacculi. 



4. — Farther development of the germ, c, brown body (nucJevs') ; d, j>ro- 

 boscis. 



5 and 6. — Young Noctilucce. h, rod ; c, brown body {nucleus) ; d, pro- 

 boscis. 



7. — Monstrous Noctiluca. 



8. — The granular body from the interior of the Noctiluca (tig. 1/) higlily 

 magnified. 



9. — Luminous discs found among the Noctilucce. 

 10. — The minute bodies seated on the upper border of these discs. 



Figures illustrating Dr. Allman's Paper. 



11. — Bursaria Micas, Ehr., magnitied about 90 diameters. 

 a. Nucleus. 

 i. Contractile space. 



c. Digestive vacuole filled with food. 



d. Mouth. 



12. — Ideal Section of Bursaria leucas. 

 a. Nucleus. 



e. Dermal layer containing trichocysts, and covered with cilia. 

 /. Green globules forming a distinct stratum beneath the 



dermal layer. 

 g. Granular colourless contents. 

 13. — A portion of the outline of the animal after the application of acetic 

 acid. 'Ihe trichocysts have become changed into long acicular 

 bodies, some of which radiate from the surface, to which they 

 still partially adhere, while others are scattered over the stage of 

 the microscope. 

 14. — A greatly enlarged view of the margin, to show the position of the 

 trichocysts. 



/. Green globules. 

 g. Granular contents. 

 h. Trichocysts. 

 i. Cilia. 

 15. — Isolated trichocysts in a quiescent state. 

 16. — First stage of evolution — the trichocysts have become transformed 



into spherules. 

 17. — Second stage of evolution — the spherules are replaced by a spiral 



filament, which rapidly unrolls. 

 18. — Final stage of evolution — the completely unrolled filament lies as a 

 transparent spiculum in the field of the microscope. 



k. Spicula Avith a filiform appendage at one extremity. 

 I. Spicula without the filiform appendage. 



s 



