^7 



PLATE XXVI. 



Hymebaphia vekmiculata, Boiverbank. 



Vol. ii, p. 141, ' Mon. Biit. Spongiacia;.' 



Fig. 1. — A portion of the sponge exhibiting the 

 basal membranes covered with its characteiistic in- 

 equiacerate, vermiculoid spicula with the proximal ends 

 of numerous long acuate skeleton spicula projecting 

 from it at various augles to its surface, and one of the 

 same description of spicula recumbent at a X 80 

 linear. 



Fig. 2. — A small angvilar pebble from the deep sea, 

 Shetland, by Mr. Barlee, having the whole of the upper 

 surface {a) encrusted with the thin yellow sponge. 

 Natural size. 



Fig. 3. — Half of a bouldered pebble with a thin 

 circular patch of the sponge upon it, from the same 

 locality as No. 2. Natural size. 



Vol. i, Plate I, fig. 5, represents one of the inequi- 

 acerate vermiculoid spicula. X 175 linear. 



I am indebted to my fi^iend Mr. Peach for many 

 other specimens of this interesting sponge. The 

 species appears to be by no means rare on pebbles and 

 dead shells. 



Hymeraphia clavata, Boiverbank. 



Vol. ii, p. 143, ' Men. Brit. Spongiada3.' 



Fig. 4. — A microscopical view of a portion of a 

 sponge exhibiting the external surface and a portion 

 of the basal membrane through an osculum. X 80 

 linear. 



Fig. 5. — A sponge covering a portion of the outer 



