130 ARCHEGONIATES. 
cytoplasm along whose outer edge is a delicate thread or band derived 
also from the cytoplasm, and from which the cilia are developed (Fig. 
52, A). Belajeff was the first to call attention to the cilia-bearing 
band, which he observed in the development of the spermatozoid in a 
fern and in Aguzsetum. He also reported a similar body in Chara. 
In speaking of the body which gives rise to the cilia-bearing band, 
Belajeff used the term ‘‘ Nebenkern,” because of its apparent resem- 
blance to a body of that nature in the spermatid of certain animals. 
In 1897 Webber described the development of the cilia-bearer in the 
spermatozoid mother-cell of Zamza, and gave to it the name dleph- 
A, grandmother-cell of spermatozoid with two primordia of bleph- 
aroplasts. 
B, two spermatozoid mother-cells, each with its blepharoplast 
primordium, 
C, spermatozoid mother-cell rounded off. 
D, the young blepharoplast has begun to elongate. 
E, stage a little older than D. 
F, blepharoplast much elongated ; its anterior end extends out to 
plasma membrane. 
G, transformation of nucleus has begun; it is somewhat pear- 
Fic. 51.—Development of sperma- shaped, being concave on side turned from blepharoplast; end 
tozoid in Gynnogramme sul- which will be anterior in mature sperm is pointed. 
phurea.—(After Belajeff.) H, later stage; cilia have been developed from the blepharoplast. 
aroplast,| Ikeno and Hirase, who were the first to discover the 
spermatozoid in certain gymnosperms, described the development of 
the cilia-bearing band in the spernfatozoid of Cycas and Ginkgo. 
Belajeff and the two Japanese investigators consider the body 
developing into the blepharoplast as a centrosome. The author is 
convinced that it has been clearly proved that the blepharoplast is not 
a centrosome, nor, as yet, has any phylogenetic relationship been 
shown to exist between the blepharoplast and the centrosome as we 
know this structure in plants.’ 
THE SPERMATOZOID. 
The development of the spermatozoid in Oxoclea, as described by 
Shaw (’98), is quite similar to that of Gymnogramme according to 
1 From BAepapts, eyelash or cilium ; and mAagzos, formed. 
2 See Introduction, p. 46, 
’ 
