546 



specimens of the yellow and white varieties of Alcyonium digitatum. 

 Thin free-hand sections were made and examined with fairly high po- 

 wers of the microscope, when the stellate cells of the mesogloea could 

 be easily observed. A single amoeboid cell was under observation and 

 sketched at intervals of about twenty minutes for from one to two 

 hours. The cell which appears to have no definite cell membrane was 

 then seen to change its shape, and by withdrawing and thrusting out 

 pseudopodia, which are really the "fibrils'' of the socalled "nerve 

 plexus", wander in a definite course through the mesogloea. About 

 a dozen living cells were examined and sketched in this manner and 



---Nu.cle.iLS. 

 Jr ■-/--- CarviiTf. 



Fig. 1, 2, 3. Sketch of a single amoeboid cell in mesogloea. An interval of half an 



hour intervened between each drawing. The cell appears moving in an upward 



direction (indicated by arrow). 



Fig. 4. Stellate cell in mesogloea. Particles of Carmine shown in black. 



in every case they were observed to be ''Amoeboid". Figures 1, 

 2 and 3. are sketches of a single amoeboid cell at intervals of half an 

 hour. The cell appears to be moving in a upword direction (indicated 

 by arrowj. 



On the advice of Professor Hickson I carried out the following 

 experiment — Minute particles of carmine were suspended in the 



