A STUDY OF HESTITUTION MASSES. 



449 



If such pieces of tentacle were not removed, and became included in 

 the restitution masses, it was noticed that they soon degenerate and 



Fig. 3. X 16. — A restitution mass 48 hours old, showing curling up of edges. 



never show any sign of regeneration, and in this our observations agree 

 with Wilson's. 



Preparations of the freshly squeezed cells were made by fixing on a 



(ik 





end.c. 



.ect. 

 end.c. 



- nem. 



Fig. 4. xoOO. — Isolated cells, after squeezing through bolting silk of 50 raesli. EcL, 

 ectoderm cells ; end. c, endoderm cells ; nem., nematocyst. 



slide with Acetic Sublimate Solution, and subsequent staining with 

 Heidenheim's Iron Hsematoxylin, followed by Lichtgriin F.S. (Fig. 4). 

 In such preparations both the ectodermal and endodermal cells were 

 -easily recognizable, though the proportion of endodermal cells was 



NEW SEKIEi-'. — VOL. X. NO. 3. OCTOBER, 1914. 



2 F 



