CARNOY’S CELL RESEARCHES. 497 
nucleus dissected out from the cell-body, so that there can be no possible 
cause of error as to the existence of the membrane. 
Fic. 18.—Cell from the testis of Astacus. Stage of karyokinesis more 
advanced than last figure. Mother-star with straight segments placed longi- 
tudinally. Spindle completely developed. The punctuated nuclear membrane, 
x, is still perfectly intact. Asters in formation. At either pole, three polar 
corpuscles, cp. 
Fic. 19.—Group of mother-cells from testis of Lithobius forficatus. 
a. Prophase, skein form. Spindle visible, nuclear membrane entire, asters 
forming. & and c. Anaphases. In 4, daughter-stars; the cytoplasma has 
invaded the spindle. There is a complete cell-plate, consisting of the spindle- 
plate, pz, and the cytoplasmic-plate, pe. In c, more advanced stage, one of 
the daughter-stars has nearly reconstituted its membrane, that is, its nucleo- 
lar membrane; the nuclear membrane, if it form, will be formed at the 
periphery of the halo. There is a thick spindle-plate, and a cytoplasmic-plate 
that has delaminated at the edge into two reflected layers, as in Fig. 3. 
Fic. 20.—Cell with two reconstituted daughter-nuclei, from the testis of the 
larva of Aphrophora spumaria. A spindle-plate was formed during the 
karyokinesis, but net. utilised. The spindle was pushed aside by the constric- 
tion, which served to halve the nucleus, and the remains of it, bearing a well- 
marked plate, are seen (sp.) lying in the cytoplasm. 
