342 PROCEEDINGS OP THE AMERICAN ACADEMY. 



found in S. heros. In the light of these later observations upon S. sub- 

 spinipes, the latter view seems probable. 



If Carnoy's observations be accepted as correct, we have three varia- 

 tions in the behavior of the chromatin during the growth period ; and 

 these variations form a graded series. In Scolopendra dalmatica the 

 chromatin, as in the majority of metazoa, is in the form of an apparent 

 reticulum or spireme distributed irregularly throughout the nucleus ; in 

 S. subspinipes the chromatin threads are aggregated in a rather loose 

 manner and are deposited upon the surface of the large nucleolus, and in 

 S. heros the chromatin filaments are so densely massed in au approxi- 

 mately spherical body — containing no nucleolar material — that it is 

 only in the most favorable cases that its true spireme structure can be 

 observed. 



Zoological Laboratory, Harvard University, 

 June 14, l'JOo. 



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