EXPLANATION OF PIvATE XII. 



Fig. I. J^Yagment oi the. skeleton oi Spoftgilla travancorica , X 70. 

 ,, la. vSkeleton spicules of the same species, X 240. 

 ., 16. V'ree microscleres of the same species, X 240 

 ,, ic. Gemmule spicules of the same species, X 240. 



id. Outline of the gemmule of the same species as seen from 

 the side, X 70. 



,, 2. Fragment of the skeleton of Pedis pongilla aurea, X 70: 

 ff. = gemmule. 



,, 2a, vSkeleton spicules of the same species, X 240. 

 ,, 26. Gemmule spicules of the same species, X 240. 

 ,, 20. The same more highly magnified (X 720). 

 ,, 2d. Gemmule of Pectispongilla aurea viewed from the side, 

 X 240. 



