149. Telophase of second mitosis, showing masses of chromatin left behind in cytoplasm.
150. Spermatid with extranuclear chromatin (a).
151. Similar stage; different view of spindle-remains (s) and of chromatin element (x2).
152-153. Spermatid with divided spindle-substance and the corresponding double-tailed form.
154-155. Stages between 156 and 158.
156-157. Older spermatids than 151, showing spindle-remains (s) and centrosome (c).
158-160. Later stages in development of sperm-head.
161. Ripe spermatozoön.
162-168. Degenerate spermatids and spermatozoa.
