230 - BOTANICAL GAZETTE [APRIL 
BLOCHMANN (’94) and KEUTEN (’95) first described the division 
of the centronucleus in Euglena, and the latter author gave an inter- 
pretation of the function of the nucleolus, giving to it the name 
“nucleolo-centrosoma” (p. 219). According to KEUTEN’s observa- 
tions, the nucleolus-like body of Euglena elongates in the prophases 
of nuclear division, and functions as a kind of spindle, which, how- 
ever, appears to be solid and homogeneous, and not fibrillar as in the 
usual type of spindle. Other spindle substance and centrosomes, as 
well as “pole-bodies,” the author could not find. The chromatin 
forms many chromosome-like bodies, which, after passing through 
an “‘equatorial ring” stage, are finally arranged in diverging daughter 
groups about the elongated axial strand of the nucleolo-centrosome. 
Just what the relation is between the dumb-bell shaped nucleolo-cen- 
trosome and the dividing chromosomes is not made clear in KEv- 
TEN’S figures, although he asserts that this axial rod governs the entire 
process of nuclear division, since it orients the plane of division and 
since the chromosomes move along it. Whether this intranuclear 
body functions solely as an active fibrous mechanism for separating 
the chromosomes, or whether its poles have in addition the properties 
of centrosomes, are matters which should be more clearly determined 
before we can make comparisons with the conditions in Empusa. 
BoveERI (:00, p. 182, note) suggests in this connection that the 
nucleolo-centrosome of Euglena is probably a concentrated and 
sharply individualized intranuclear spindle. CaLkINs (:01, p. 265) 
further points out what he regards as an analogy existing between 
such a connecting rod in Euglena and the true fibrous spindle seen in 
higher forms. ? 
SCHAUDINN (:00) has described a type of nuclear division in the 
sporozoan, Coccidium shubergi, parasitic in the intestine of a myri- 
apod, which resembles even more closely that of Empusa. In the 
growing individual, according to this author, the nuclei divide a 
number of times, and finally, by a process resembling progressive 
cleavage, the body is cut up into many uninucleate individuals, which 
he terms merozoites. . The division of the nucleus at this time is by a 
“primitive mitosis” (p. 230), totally unlike the double division which 
takes place in later stages, following the fertilization of the egg. The 
division in the first instance is quite similar to that of Amoeba and 
