(402 ) 
133. Apex of pollen-tube as it appears in the micropyle. X 440. 
134. Odspore and young endosperm. XX 
135. Showing relative extent of eens in the same case as 134. 
X 160. 
136. Showing form and structure of the endosperm. XX 3 
137. Embryo-sac (crook-neck squash) near maturity. a 
138. Young embryo (Chile squash). 440. 
Coccinia cordifolia (PLATE 67). 
139. Megaspore-mother-cell and tapetum. > 440. 
140. Four-celled embryo-sac. 40. 
Sicyos angulata (PLATE 67). 
141. Nucellus and inner integuments. Megaspore-mother-cell after first 
division. X 184. 
142. Embryo-sac of four cells. > 440, 
147. Showing progress of endosperm formation, By, 312, 
Micrampelis lobata (PLATES 68 AND 69). 
148. Nucellus and spore-mother-cell. 184. 
149. Telophase of first division of spore-mother-cell, < 440 
150-151. Two-celled embryo-sacs of slightly different ages. x 440. 
152. Embryo-sac of four oe 440. 
153. Embryo-sac of eight ce 312 
154. Showing process of pine or in the embryo-sac of eight cells. 
X 440. 
155. Embryo-sac near maturit 
156. Young embryo and eudespertn Showing 
and the pollen tube. X 312 
157. Slightly later stage than 156. Embryo of about ten cells. 312. 
158. Embryo and endosperm. Characteristic appearance of endosperm 
in the early stages of embryonic development. > 120. 
159. Later stage in the development of embryo and endosperm. X 36. 
1 
t of a synergid 
Cyclanthera explodens (PLATE 68), 
160. Apex of young nucellus about the time of the appearance of the 
ee 440. 
Spore-mother-cell and tapetum. > 440. 
s Showing the megaspore and its position with reference to the apex 
of the nucellus, 
163. Embryo-sac of ae cells. S 440. 
164. Embryo-sac nearly mature. 
165. Young embryo-sac and nena X 440. 
166. Showing form of ovule, the pollen: tube, the endosperm and the por- 
tion of the nucellus disorganized. Oo. 
