Landbe. — Hemiurus crenatus. 



PLATE 2. 



Fig. 14. Nearly sagittal section of the posterior portion of the appendix. X 300. 

 Figs. 15-24. Successive stages in the development of spermatozoa, showing stages 



in the development of sperni-morula. X 1350. 

 Fig. 25. Transverse section of body through the posterior portion of the trunk. 



X 300. 



