486 
J. BRONTE GATENBY. 
(8) The macromitosome may become normally elongated 
in sperms in which the nuclei are degenerate. 
(9) It is suggested that the abnormal sperms are unable to 
bring about fertilisation. 
(10) Individual nuclei can be reconstituted from separate 
chromosomes. 
(11) At least partial inter-dependence of some cell ele- 
ments is indicated by degenerate stages. 
(12) Two centres of force, lodged respectively in the 
nucleus and in the centrosome, seem to be present. 
Department of Physiology, Oxford ; 
March 19th, 1917. 
Bibliography. 
1. Reinke, E. — “The Apyrene Spermatozoa of S trombus bitu- 
berculatus, Tortugas Laboratory, vol. vi. 
2. Meves. — “ Ueber oligopyrene und apyrene Spermien und ueber 
ihre Entstelmng nacli Beobaclitungen an Paludina und Pygsera,” 
• Arch. Mikr. Anat.,' lxi, 1903. 
3. Federly, H. — “ Das Verlialten der Chromosomen bei der Sperma- 
togenese der Schmellerlenge,” etc., ‘ Zeit. f. unduktive Abstain. 
Yererb.,’ Bd. 9, 1913. 
4. Gatenby, J. Bronte. — “ The Cytoplasmic Inclusions of the Germ- 
Cells.” Part I, Lepidoptera, ‘ Quart. Journ. Micr. Sci.,’ vol. 62, 
1917. 
5. Duesberg, J. — “ La Spermeogenese chez le nat,” ‘ Arch, Zellforsch.,’ 
1909. 
6. Hertwig. — “ Ueber Correlation von Zellund Kerngroesse,” ‘ Biol. 
Centrbl,’ xxiii, 1903. 
7. Goldschmidt. — ‘ Science,’ vol. xliv, No. 1137. 
8. Goodrich, E. G., ‘ Quart. Journ. Micr. Sci.,’ vol. lvii. 
