4 



Miss D. J. Lloyd. Influence of Osmotic 



to 3 mm. in length, i.e. after 10 weeks, the last trace of the generative system 

 has vanished. 



Stoppenbrink (15) has recorded similar occurrences in starving Planaria. 

 He states that the order of disappearance is : — Yolk-glands, copulatory 

 apparatus, testes, and ovaries. In Gunda, while the yolk-glands disappear 

 first, the rest of the genital system appears to be absorbed at a uniform rate. 

 Stoppenbrink states that there is no phagocytosis in the absorption of the 

 organs. In Gunda the fact that an organ undergoing reduction is always 

 surrounded by a sheath of parenchyma cells (see fig. 4, B), some of which 

 even penetrate into the various organs, makes it appear probable that the 

 organs are destroyed by a phagocytic action of the undifferentiated 

 parenchyma. Fig. 2 shows an adult testis, fig. 3 a testis undergoing 

 degeneration. Figs. 4, A and B, show the changes in the ovary. 



Fig. 3.— Testis after 21 Days' Regeneration of Posterior End in Sea-water. 

 deg.sp.c, degenerating spermatocytes, tes., testis. 



