294 PROCEEDINGS OF THE ACADEMY OF [May, 



postponed until the next moult of the inteslinal lining. The old 

 intinia evidently would present considerable resistance to the forma- 

 tion of a furrow, which is always to be seen in the intima between 



Fig. 2. — A, longitudinal section of intestine of a young Porcellio 

 (3 mm.); B, transverse section of the same ; C, optical "section of intes 

 tinal cells of young Porcellio (1.8 mm.) immediately after moult of 

 the posterior half. All these figures illustrate growth of the intestine by 

 amitosis. A and B X 280, O X 600, nuclei in G show post-mortem 

 changes. 



cells. Moreover, there is nothing to indicate that the|nuclei] repre- 

 sented as already separate in these figures {A and B) have not 

 been so for a considerable time, while the frequent occurrence of 

 two nucleated cells, with no other sign of division, would speak 

 strongly for this. 



Several authors have reported cells with two or three nuclei, and 

 Carnoy (10) finds as many as ten to thirty nuclei in the intestinal 

 cells of Cirolana. So large a number is due, I have abundant reason 

 to believe, to fragmentation of the nuclei, not to amitosis, as Car- 

 noy states {I. c. ). Schonichen discredits JNIcMurrich's evidence 

 (to the same effect as my own), holding that the fragmented nuclei 

 resolve on focusing carefully into the nuclei of the muscle fibres. 

 He evidently has not seen the phenomenon reported by McMurrich. 

 Space does not permit an account of the unquestionable cases of 

 fragmentation which I have seen. A whole plate of figures might 



