JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XX, 



Illustrating Professor E. Ray Lankester's Memoir on the 

 " Chlorophyll-corpuscles and Amyloid Depositii of Spon- 

 gilla and Hydra.'' 



The following references are true for all the figures. 



«. Nucleus, c. Normal chlorophyll-corpuscle, cc. Small and irregu- 

 larly shaped chlorophyll-corpuscles. ccc. Unusually large chlorophyll- 

 corpuscle, g. Colourless granules, probably related to the chlorophyll- 

 corpuscles, amv. Amyloid substance occupying a large vacuole, amg. 

 Amyloid granules, scattered in the superficial protoplasm of the cells of 

 Spongilla. br. Irregular brown corpuscles of Hydra. 



N.B. — A uniform green tint has been adopted in the plate for the cor- 

 responding green tint of the corpuscles ; but it is to be remembered that 

 often the corpuscles of Spongilla are of a more yellow green than here 

 represented. 



Figs. 1 to 14 are from Spongilla. Figs, 15 to 24 are from Hydra. 



Spongilla. 



Fig. 1. — Amoeboid cell of Spongilla fluviatilis, showing nucleus (»), 

 chlorophyll-corpuscles (c), colourless angular corpuscles {g), and large 

 amyloid vacuole {amv). Living. 



Fig. 2. — A similar cell, drawn from a living specimen {ccc), large chlo- 

 rophyll-corpuscle with emarginated capsule. 



Fig. 3. — Amyloid vacuole coloured purple, after treatment with dilute 

 solution of iodine in KI. 



Fig. 4. — Amoeboid cell similarly treated, showing chlorophyll- corpuscles 

 (c), amyloid granules {amg), and amyloid vacuole {amv). 



Fig. 5. — Outline of an amoeboid cell to show the superficial position of 

 the amyloid granules, coloured purple by iodine. 



Fig. 6. — Amoeboid cell from a colourless specimen of Spongilla, showing 

 nucleus {ii) and {g) colourless angular corpuscles, the supposed repre- 

 sentatives of chlorophyll-corpuscles ; gg, a colourless corpuscle with cap- 

 like development, similar in form to the chlorophyll-cap. Drawn from a 

 fresh living specimen. 



Fig. 7. — Similar specimen from a portion of Spongilla of a very pale 

 green. It shows, besides the representative colourless corpuscles {g), three 

 actual chlorophyll-corpuscles (c). 



Fig. 8. — Amoeboid cell of Spongilla, immediately after treatment with 

 dilute iodine solution in KI, to show the superficially placed amyloid 

 granules {amg). 



