162 
spiculo-tufts, directed more or less perpendicular to the surface; 
the small tylostyli compose mainly the tufts, the bigger ones mamly 
Spicules: (fig. 34) 1. tylostyli; slightly curved, the bendmg 
may be situated in several places; thickest just beneath the bend- 
ins- the head not situated at the very base, wherefore this latter 
is seen as a Hule prominent part of the head. Length varying from 
156—403 ft.. But two groups of sizes are dominating, one about 
190 and one about 309 fit", thickness 7 11 
Suberites incrustans nov. sp. 
Perseverance Harbour. Campbell Island. 20 f. Sandy mud. 10/XII.1914., 
Incrusting on a Shell as a very thin layer, only up to Vs mm 
thick. Dermal-membrane exceedingly fine, covers small subdermal- 
cavities, which are seen below as dark spots. Oscula few and scat- 
tered, O.s-s mm in diameter. Ostia? Surface in a few places even, 
in otiier’ places very finely hispid. Consistence rather soft, shmy, 
thin, like wet skin. Colour clear pale-gray to dirty gray (on ac- 
count of foreign particles). 
Skeleton consists of irregularly dispersed spicules, lying for the 
main part without any order, only in few places indications of 
spiculo-fibres are found. 
Spicules: (fig. 35) tylostyli, somewhat curved, with beautifully 
marked heads, thickest at about the bending. tapering very evenly 
to the sharp-pointed apex. Varying in length from ca. ITOfi—530ft, 
by a thickness of up to 12 13 
Family Polymastiidae. 
Genus Polymastia, Bwk. 
Polymastia granulosa nov. sp. 
Figure 8 Island, Carnley Harbour. Under stones at lowwater. 2/XII.1914. 
Incrusting. Of the specimen in hånd, which is somewhat dam- 
aged, the greater part consists of a bark-layer. The most character- 
istic external feature of the sponge are the numerous fistulae. 
