SPICULES OF SYNAPTA AND AURIOULARIA LAEVA. 505 



(3) The extension of the scleroplasm depositing the spicule 

 is determined by the growth of the spicule itself, and is not 



TKXT-riG. 6. 



'i'he abnormal siliceous spicule fouud inserted into the body of au Auricu- 

 laria larva. The whole spicule is enveloped in a large syncytium. 

 Nearly midway in its length is situated the cluster of curious 

 radiating spines with swollen bases attached to the niaiu shaft. The 

 figure of the entire spicule is magniQed just over 500 diameters. 



the result of a mould-forming tendency on the part of the 

 protoplasm, as Chun asserted. 



