524 Black. —The Morphology of Riccia Frostii , Aust. 
They may lose their triangular shape, as seen in Figs. 69 and 70, and 
eventually become somewhat rounded. Meantime, the body at the poles 
begins to elongate slightly, as shown in the same figures and in Fig. 66. 
This body is the origin of the blepharoplast. 
The Development of the Sperm. 
The development of the sperm in Riccia Frostii adds little that is new. 
The blepharoplast grows from an end which may be called the head or 
anterior end, and which is slightly larger than the posterior portion. It 
develops as an irregular cord, appearing somewhat granular (Figs. 71 and 
72). Figs. 73-75 show the blepharoplast in different positions. In Fig. 73 
it is seen on the edge of the plasma membrane ; in Fig. 74 a different angle 
is obtained, and the cord-like nature of the blepharoplast is observed. This 
figure is just reversed in Fig. 75, and the two ends of the blepharoplast are 
seen coming up from under the cell. The developing cell may be a some- 
what elongated narrow cell, as seen in Figs. 71-75, or it may become 
spherical, as in Figs. 76- 78. About this time a vacuole usually appears in 
the cytoplasm opposite the nucleus (Figs. 72, 76, and 77). This vacuole 
finally reaches the periphery of the cell (Figs. 79 and 80). The blepharo- 
plast is now a cord extending about three-fourths of the way around the 
cell. The next step is the elongation of the nucleus, which becomes homo- 
geneous, stains brilliantly with anilin safranin, and assumes the shape of 
a crescent (Fig. 80). The position of the nucleus also changes. In Fig. 80 
the nucleus occupies the edge of the cell and is in contact with the blepharo- 
plast. In Fig. 81 two cilia are seen developing from the blepharoplast, 
which is a narrow band connecting the head with the nucleus. The nucleus 
is a slender crescent and stains homogeneously. No distinction can be seen 
between the nucleus and blepharoplast, and it is impossible to tell how far 
the blepharoplast extends along the nucleus in this and succeeding figures. 
The crescent shape of the entire cell may be aided by the vacuole 
(Figs. 79-81). 
Figs. 82 and 83, of a somewhat similar stage as Fig. 8i, show two cilia 
grown out from the blepharoplast just back of the head. The head is a 
prominent part of the sperm, always staining more intensely than other parts. 
The cilia extend a little more than the circle of the sperm. In Fig. 84 the 
crescent-shaped nucleus is seen with the blepharoplast extending from the 
anterior end as a slender cord terminating in the darkly-staining head. 
Two cilia are attached at the base of the head and circle around the nucleus. 
In the curve of the nucleus is the somewhat granular cytoplasm. No 
extension of the blepharoplast is distinguished at the other extremity of 
the nucleus. The remaining cytoplasm or vesicle sometimes persists in 
a coil of the nucleus (Figs. 87 and 88), or it may disappear early (Fig. 86). 
As the sperm matures the blepharoplast becomes long, extending as a fine 
