212 Mr. H. J. Carter on 



which it is composed. Surface more or less uneven, according 

 to the form assumed by the subdermal sand. Pores in the 

 intervals between the dermal projections, wherein the sarcode 

 may or may not be charged with foreign material. Vents 

 numerous and large, chiefly situated on the most projecting 

 parts or ridges, or on the opposite side to that of the pores. 

 Structure coarse from the large size of the grains of sand of 

 which the species is composed. Size variable. 



Hab. Marine. 



Loc. Port Phillip Heads, South Australia. Depth variable, 

 under 20 fath. 



Obs. Examined both in the wet and dried states. The 

 specimens of this species, which are very numerous, vary so 

 much in shape and size that it is hardly possible to give more 

 than the above general description of them, in which the most 

 striking character is the coarseness and grittiness of the sand ; 

 hence the designation. 



2. Holopsamma Icevis, n. sp. 



Specimens very irregular in form, which is massive and 

 more or less variably lobed, spreading horizontally while it 

 rests upon a number of points over which it may be arched, so 

 as to present an upper and a lower surface. Consistence 

 light, gritty, friable. Colour grey externally, orange yel- 

 lowish or grey internally. Surface even, consisting both 

 above and below of a dermal layer of sarcode more or less 

 charged with foreign objects, which, being principally frag- 

 mentary sponge-spicules, give it a white colour when dry. 

 Pores in juxtaposition throughout the dermal layer, but 

 chiefly on the upper surface. Vents numerous and large on 

 the prominent parts, but chiefly on the lower surface. Struc- 

 ture less coarse than that of the foregoing species, and there- 

 fore looser and lighter, being generally composed of much 

 smaller grains of sand. Size variable. 



Hab. Marine. 



Loc. Port Phillip Heads, South Australia. Depth varying 

 under 20 fath. 



Obs. Examined both in the wet and dried state. Designated 

 from its comparatively light, not heavy, structure. Of this 

 species also there are several specimens, in most of which the 

 sarcode internally is orange-yellow and more or less charged 

 with ova of the same colour, but much deeper. 



o. Ilulopsamma lamincefavosa^ n. sp. 



Specimen hemispherical, globular, elongate, sessile or con- 



