304 ON SPERMATOZOA OF GAUNCHA AND SYCON. 



Fig. 2. The same, sketched with a higher eye-piece. 



* Fig. 3. (x ahout 1000.) End of March or early April. A similar stiff-tailed organism 



-with smaller body, in another living preparation of the same species and trope. 



Fig. 4. (X about 500.) Jan. 20. Section through part of the cloacal epithelium (e.e.) of 

 <S. raphanus t. aquariensis killed in iodine, overstained in borax-carmine. Five 

 gonocytes are shown (i/.ff.) and four "dolly-cells" (d.d.). At (c.c.) the section 

 cuts the wall of a flagellate chamber. [A dolly with stiff tail since observed.] 



*Fig. 5. (X about 1300.) Similar preparation killed in osmic acid, stained with aqueous 

 methyl-green. The gonocyte shows a ' germinal vesicle ' with 'germinal spot,' 

 and contains some scores of spherules of varying sine stained only in spots at 

 their centres. The spherical cell with a knob (" dolly" from its likeness to a 

 washerwoman's dolly of "blue") is emerging from [or entering] the gonocyte, 

 and is half-way through the epithelial cell. The linear dimensions of the dolly 

 and its knob are about § those of the knobbed body in fig. 1. January. 



* Fig. 6. ( X about 1400.) Another gonocyte and dolly-cell stained with hematoxylin and 



methyl-green. Jan. 24. 

 Fig. 7. (X about 2200.) July 13. Spermatozoa ("minute wandering-cells" of Alinchin, 

 " cercids " of Note A, infra, p. 315) of Guancha coriacea t. primordialis. Sketched 

 from a preparation of iodine in sea-water, the granules (shown in two of the 

 outlines) were yellow with the iodine. No spermatozoa were found in the 

 preparation except where this cloud poured out. 



[* These figures were added since the paper was read. See Postscript, p. 303.] 



