169 



PLATE LXVI. 



CHALINA OCULATA, BowerbanJc. 



Vol. ii, p. 361, ' Mon. Brit. Spongiadse.' 



Fig. 1. Represents a fine specimen of the species 

 from the Diamond Ground, off Hastings, received in the 

 living state, but drawn from the dried specimen very 

 slightly reduced in size. 



Fig. 2. A skeleton spiculum. X 530 linear. 



Fig. 3. A tension spiculum from the dermal mem- 

 brane. X 530 linear. The tension spicula of the 

 interstitial membranes are precisely the same in size 

 and form as those of the dermal membrane. 



I have seen this sponge in rock caverns between high 

 and low water in a living state, usually in a pendulous 

 position, but I have two specimens based on the flat 

 upper shell of two large Pecten maximus, four or five 

 inches in height, which I received in the living con- 

 dition, full of sarcode, and they maintained the upright 

 position as rigidly as if they were sprigs of wood. In 

 the skeleton state, with the sarcode removed by mace- 

 ration in the sea, as we so frequently find it thrown up 

 on the beach, it is familiar to us all as especially soft 

 and flexible. 



In vol. i, Plate XIII, fig. 262, the spiculous Keratose 

 fibre of this species is represented. X 175 linear. 



