169 



PLATE LXVI. 



Chalina oculata, Boiverhanlc. 



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 

 hving state, but drawn from the dried specimen very 

 slightly reduced in size. 



Fig. 2. — A skeleton spiculum. x 530 linear. 



Fig. 3. — A tension sj)iculum 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 maxinvits, 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 uj^ 

 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. 



