ON THE SPERMATOGENESIS OF THE SILK-WORM. 151 



the periphery of the nucleus and finally form a compact, deeply 

 stainable mass with pointed end and vacuole. This chromatin 

 mass gradually elongates and forms a spindle-shaped head of a 

 spermatozoon. From the remnants of the " Verbindungsfaden," 

 a "Nebenkern" is formed, which elongates and enters into the 

 tail part. A mitosome is also seen, arising from the cytomicro- 

 somes. 



End of December, 1893. 



