42 
W. E. AGAR. 
Schreiner, A. & K. E. — “Die Reifung der mannlichen Geschlechtszellen 
yon Salamandra maculosa (Lain*.), Spinaxniger (Bonap.), 
und Myxine glutinosa (L.),” ‘ Arch, de Biol.,’ xxii, 1906. 
Stevens, N. M. — “The Chromosomes in the Germ-cells of Culex,” 
‘ Journ. Exper. Zool.,’ viii, 1910. 
Strasburger, E. — •“ Apogamie bei Marsilia, ’ ‘Flora,’ xcvii, 1907. 
— “ Zeitpunkt der Bestimmung des Geschleclits, Apogamie, 
Parthenogenesis und Reduktionsteilung,” ‘ Histolog. Beitr.,’ 
vii, 1909. 
“ Sexuelle und apogame Fortpflanzung bei Urticaceen,” ‘ Jahrb. 
f. wiss. Bot.,’ xlvii, 1910. 
Wilcox, E. Y. — “Spermatogenesis of Caloptenus femur-rubrum 
and Cicada tibicen,” ‘Bull. Mus. Comp. Zool. Harvard,’ xxvii, 
1895. 
y. Winiwarter, H. — “Reclierches sur l’Ovogenese et l’Organo — genese de 
l’ovaire des Mammiferes (Lapin et Homme),” ‘Arch, de Biol.,’ 
xvii, 1900. 
EXPLANATION OF PLATES* 1-5, 
■illustrating Dr. W. E. Agar’s Memoir on “ T he Spermato- 
genesis of Lepidosiren par ad ox a.” 
[All figures were drawn with the Abbe camera, and except figs. 37 and 
38, under a magnification of 2100 diameters (Leitz oil imm., Zeiss 
12 comp.) In most cases the details were confirmed with the help of 
Zeiss’s stereoscopic eyepiece. Final magnification of figures, as re- 
produced, 1400 diameters. In no case, except fig. 38, has any attempt 
been made to show the structure of the cytoplasm. In every case the 
most superficial chromatin is most darkly shaded, the deeper parts 
being shown paler.] 
Lettering. 
b. Bivalent. I. A member of the large pair of chromosomes, n. 
Nucleolus, p. Ex-conjugants in the act of pairing for the second time. 
8. Conjugants separating, u. Univalent. 
Fig. 1. — Resting spermatogonium from one of the earlier generations, 
showing diffuse substance filling the nucleus and largely concealing the 
chromatin. Corrosive-acetic. 
Fig. 2. — Spermatogonium from one of the earlier generations of the 
period of active multiplication. Flemming. 
