18 The Significance of Sex. [ Jan. 
the nucleoli are getting clothed with a gree bounded plasma. In 4 these new 
cells or s have become elongate and arranged in a reticulum like that of 
H eles later they become free and are expelled as flagellate monads, as at 
d is a young capsule dividing; the nucleus consists of a group of nucleoli or 
udding. 
Fic. 19, a-b. Central capsule of Thalassicolla pelagica—Biitschli, after Haeckel. 
é shows the nucleus budding; it now has its chromatin in a filament which here 
and there preserves its reticulate arrangement seen i 
G. 19, c-e. Capsule of Zz. pathate- thinks fous Hertwig, etc.—In ¢ the 
chromatin is in a surface layer of microsomata and a central granular mass. In d 
the microsomata are in the form of beaded filaments. In ethe capsule contains 
ny small nuclei — and outside are similar grouse that have probably 
migrated from the c 
Fic. 20, a. Nuc ‘Nis ka Ameba lucida (multinucleate)—Gruber, Z.. w. Z. x 
The “ membrane” bounding the nucleoplasm is at a distance outside of that in a 
the chromatin bodies lie. These have irregular processes in a, indicating the pres- 
ence of a reticulum. In e the nucleus is dividing; the two daughters are los: con- 
nected by a bridge of hyaloplasm like that which is seen in Figs. 41, 42, € 
Fic. z a-c. Nucleus of 4. prima—Gruber, Z. w. Z., xli. 
Fic. 22, a-d. Nucleus of Engh pha alveolata—Gruber, Z. w. Z., xl.—a shows a 
central tes eolus, 6 many p es. Inct = are massed near the centre; in d * 
they have ng ot eN so as to fill the ke and e h has taken on itself a structure 
similar to æ. This reminds us of the “ germinal balis” of Stein and others 
Fic. 23. Nucleus a Ceratium pak ea filled with germs that are wit free to 
reproduce the mother 
Fic. 24. Tirini C orii, A. m. A., iii, (see Lankester, “ Protozoa,” 
Encyc. Brit.).—The plasma in which the simple aeea bodies live, move, 
and divide is in the act of digesting a'conferva filam 
Fic. 25. A section near the surface of piston saen after 
Haeckel.—A layer of “ yellow cells” raene "a on the surface. The body is 
formed of spherical vacuoles, “ needles,” and a “ syncytium” of nucleated plasma 
masses, united by processes with one another. ean Fig. 1, also volvox, a reticu- 
lum of nerve-cells, and Figs.-8-10, etc. The physiological reason for this structure 
is probably alike in these ges ce 6 shows : — oe the a el 
its reticulum appear as iding are oft 
Fic. 26, a-h. A oi ae = Sinica villosa—Greeff, A. m. A., x.—a one 
nucleotus. In ¢ there are several, one central, and a peripheral set. In d'each has 
. split up into a group of granules or small microsomata; in ¢ these have again 
united, and in each nucleolus repeats the structure of a, and is set free as g. isa 
“ refringent corpuscle,’’ formed from g by Glseppeaninee of the nucleolus, 
5 PLATE II. ; 
Fic. 27, ae. Nucleus of Kiotiaocopiana Schneider, A. Z. E. G ad eke 
s ‘budding off smaller nucleoli, which in ¢ whisnetely Ieee 
come nucleolated; d shows nuclei dividing ; e shows a cyst wher e the remains of 
ie. 2 
