TRANSACTIONS OF MICROSCOPICAL SOCIETY. 
DESCRIPTION OF PLATE VL 
Figures 1 to 11 illustrate Mr. T. C. Druce^s paper on the 
Reproductive Process in the Confervoidese. 
Kg. 
1. — Abnormal condition of Sjilrogyra communis, caused by the extension 
of a conjugation papilla, no reciprocating filament being near ; 
figured to show that the papilla is essentially only a branch. 
2. — Cell of Spirogyra — decaying, the contents converted into globular 
bodies — evidently not connected with reproduction, the granular 
character of true spores being wanting ; the true spores and si)0- 
rangia being, moreover, formed from the whole contents of each cell. 
3 and 4. — Antheridial function in (Edogonium ; extrusion of true or 
resting-spore, and its fecundation by antherozoids, previous to the 
formation of its coats ; a, antheridial capsules ; b, antherozoids ; 
d, resting-spore. 
5, 6 and 7. — Antheridial function in Spirogyra ; a, colourless zoospores of 
Henfrey ; b, the same increased in size, become spherical and 
motionless, and filled with purplish-black endochrome ; d, the same 
after an hour or two, greatly enlarged ; e, encysted portion of endo- 
chrome. 
'^.— (Edogonium; resting-spore now changed to the characteristic colour 
produced from one cell ; in another the antheridial capsules and 
antherozoids. 
9. — Another resting-spore of (Edogonium. 
10 and 11. — Antheriadal function in Cladophora ; not glomerata ; a, nearly 
colourless zoospores ; ^, one zoospore escaped from the ordinary 
aperture in the species ; c, the capsules become spherical and motion- 
less ; d, capsule burst into antherozoids. 
rigs. 1 to 9 X 310 diameters ; 10 X 195 diameters ; 11 X 310 diameters, 
but drawing enlarged. 
Figures 12 to 14 illustrate Dr. Hicks^s paper on the Amseboid 
Conditions of Volvox Globator. 
12. — Cell of final sub-division, enclosing zoospores; a, in situ ; b, detached ; 
c, changing form, as Amoeba. 
13. — Old zoospores, in situ ; a, a, enlarged and irregular ; b, undergoing 
self-division (germ-cells). 
14. — Two zoospores detached, and like Amopbte. 
