16 



Jotirnai of the Asiatic Sociely of Btuijal [Jauuarj, 1907. 



constricted near the middle, projects beyond the mierocell coatinf'- 

 and opens by means of a heart-shaped aperture distally. 



Average diameter of gemmule 



J) 



?5 



J» 



leni^th of skeleton spicule 



9> 



)? 



»9 



J» 



flesh spicule 

 gemmule 



* 4 « 



« • t 



• • 



0-55 

 0-36 



0'085 

 0075 



mm. 



M 



3J 



?> 



c 



t 



I 



f 





"tiifiifi^yi^ 



D 



A 



Fia. 1. Bpongilla proliferens. 

 sleton spicule, >c 200. B = gemmale spicule x 5-^0 C fla^K 

 spionle, X530. D = gemmule iu optical ai'ion,' 55. ^^ 



