1887] The Significance of Sex. 19 
29, a-b. Nucleus s Carchesium PEATS soe Kent, Plate 50).— 
Fig Tank does not appear constricted between the microsomata as in Fi ig. 
31, etc. Each microsoma es tae like a nucleus pe gets áielecil. which them- 
selves become cells like the ee of the “ germ-balls.” Sexual conjugation is 
ported as having preceded this sta 
pi . 30. a-ġ, Nucleus of PERE radians—Entz, M. z. S. N., vol. V.—a, 
**germ-ball’’ state; 4, stentor state. 
Fic. 31, a—c. Stentor polymorphus ee ae (Kent, Plate 50).—The fork 
in @ caused by branched budding of one of the microsomata. In å and c the chro- 
wees has contracted to form itself into he sg asians state of germ 
2. Portion of nucleus of > —Claparède and Lachmann fere i — 
nie scouleate of the part segmente of ee the nucleus of a ne 
Fic. 33. Nucleus of Urostyla gronds- Dachi (Kent).—“ Cerin bait” state. 
Fic. 34. Nucleus of Acineta jolii—Maupas, A. Z. E. G., ser. 1, vol. ix. (Kent). 
Fic. 35. Nucleus of Plagiotoma hewbvire Stel (Kent). 
Fic. 36. eee of ee E = w. Z., ze 
FIG. 37. eus of Chilodon , A. m. A. V., vol. v. (Ken 
—The A E in saleak and a “ paranucleus” resembling this Gia 
rests against the nucleus. 
Fic. 38. Nucleus of Acineta fetida—Maupas, A. Z. E. G., ser. 1, ix. (Kent). 
IG. 39. Nucleus of Vorticella—Gruber, Z. w. Z., xli.—Notice a paranucleus on 
vat concave side of the “horse-shoe” nucleu: 
G. 40. Nucleus of Reese ae anal Mee Plate 29. 
ere are seen two par: 
Fic. 41. Nucleus of Ticigastnis meleagris—Biitschli (Kent), Microsomata in 
act of dividing and so forming the beaded filament. 
Fic. 42. Nucleus of Loxodes rostrum—Wrzesniowski, Z. w. Z., xx. (Kent). — 
Paranuclei Sram e of the sub-nuclei. 
Fic, 43. Cell from pli ganglion of Arion—Carnoy, p. 212.—The nucleus is in 
— the form of a beaded filament in an “ open” knot or tangle (“ Knāuel”). 
Fic. 44. Nucleus of epidermis cell of an Orchid—Carnoy, p. 215.—The nucleus 
contains ste PRE nucleoli and a chromatic filament in a “close” tangle. The 
chromatin is in disks, and the intervening hyaloplasm is not constricted, hence the 
filament is not beaded. 
Fic. 45. Nucleus of epidermis cell of Salamander—Carnoy, p. 219.—In a, a coarse 
reticulum is formed by fusion of the EEG IPEE at ee TANT of a close 
tangle. In 4 the connections have 
formed, which, by shortening, eine an opin” tangle, and the phases of karyo- 
kinesis follow. The chromatin is diffused throughout the filament. In ¢ we see 
the chromatin withdrawing from the processes of the meshes and gathering in a 
definite path to form the beaded filament seen constructed to segments in g, 
Fic. 46. Longitudinal optic sections of various chromatic Jilaments—Camoy, p- 
232.—To show the disposition of the chromatin. In all the chromatin is super- — 
ficial, forming a thick wall in a, thin in 4, thick with coord temas and in 
_ palpi Gaii gal: ay be allel on Wa tik pa from spiral duets of 
x p Fragment of a branching Acinetan—Bolton (Kent, Plate 47).—The nu- : - 
