APPENDIX. 239 



Habitat. Berwick Bay, Holy Island (Johnston), 

 Budleigh-Salterton (Carter). 



This is not the sponge described by Bowerbank 

 under this name and which is spiculiferous. The true 

 Halisarca forms a thin gelatinous crust, which is 

 entirely devoid of spicula. 



2. HALISAECA LOBULARIS, Schmidt. 



Halisarca lobularls, Schmidt. Spong. des Adriat. Meeres, 1862, 



p. 80. 

 Halisarca lobularis, Carter. Ann. Nat. Hist., ser. 4, vol. xiii 



(1874), p. 433. 



Sponge consisting of irregularly lobed ridges about 

 a line high, extending themselves in branched digita- 

 tions over the rock. Lobes ficoid, agglomerated, 

 divided into minute lobuli with angular pits or intervals 

 between them, when they cannot from their rounded 

 forms come into contact. Surface smooth, sleek, and 

 of a pink colour on the prominent portions, passing 

 into light-brown yellow below. Vents sparse, situated 

 here and there on the lobes, not raised above the 

 surface, and sufficiently large to be visible to the 

 naked eye. Pores minute and numerous, each con- 

 sisting of a round aperture situated in the centre of a 

 papilliform ring, which rings being in juxtaposition 

 thus form the dermal surface of the lobule. No 

 spicules of any kind. Size of specimen one and a half 

 inch long by one inch wide and one line high. 



Habitat. New Red Sandstone Rocks, Budleigh- 

 Salterton. 



Geographical Distribution. Adriatic Sea. 



