168 A M0N0GEAPH OF THE 



Leonard's from Hastings. In many cases it was completely 

 covered by Halic/tondria panicea, and was to be seen only 

 when the latter was removed from the rock by a knife. 

 Although thus covered, it was apparently in a healthy con- 

 dition, and was covered with mammaeform projections of 

 about the eighth of an inch in height. The colour was 

 deep orange red. The specimens I found at Mill Bay, 

 Cornwall, were smooth and even at the surface in the live 

 state, but assumed a slightly corrugated state when dried. 

 I have in some specimens observed that the dermal and in- 

 terstitial membranes have been minutely granulated, but 

 this does not appear to be a constant character ; when pre- 

 sent, it requires a power of about 500 linear to render the 

 granules distinctly visible. 



12. Hymeniacidon sanguinea, Boioerbank. 



Spongia sanguinea, Grant. 

 Halichondria sanguinea, Fleming. 

 Jolaiston. 



Sponge. Encrusting ; surface smooth and undulating, or 

 rugged, with ridges or elevations. Oscula simple, 

 numerous, small. Pores inconspicuous. Dermal 

 membrane abundantly spiculous ; spicula acuate, 

 long and slender, irregularly dispersed. Skeleton. 

 Spicula acuate, stout and long, often slightly flexuous. 



Colour, Alive, deep blood red. 



Habitat. Dublin Bay, Lambay Island, William Thomp- 

 son, Esq. ; Berwick Bay, Dr. Johnston ; StafTa, Iona, Isle 

 of Skye, Dr. Grant ; Island of Bofin, Connemara, Rev. 

 Robert Hudson ; Roundstone Bay, Ireland, and Island of 

 Arran, Ireland, J. S. Bowerbank. 



Examined. In the dried state. 



In the Johnstonian collection of British sponges at the 

 British Museum there are five specimens, labelled Ilali- 

 chonclria sanguinea, distinguished as 27a, 21b, 21c, 21 d. 



