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meshes just beneath the dermal membrane bundles of spicules are 
radiating through this latter. 
Spicules: (fig. 3a—d), oxea, slightly bent at the middle, the 
outmost third tapering to a very often sharp-pointed apex. A few 
sponge-fragments contain several oxea besides the common oxea, 
which are so blunt that they may most properly be called strong- 
ylote. A few oxea are centrotylote. Length about 130—135 /u, 
thickness about 6,6—8 /ti. 
Of the known Reniera-speciQS R. cinerea comes nearest to the 
species in hånd; the spicules in R. c. are most commonly about 
140 p by 8 /r, thus a little larger than here; but this difference 
is hardly sufficient for creating a new species. 
Reniera heterojibrosa Ldbck. 
1902, Reniera heterojibrosa, Lundbeck. — Porifera in ‘The Danish Ingolf 
Exped.’ Vol. VI, Part 1. 
Perseverance Harbour. Campbell Island. Sandy mud. 10—20 f. 9/XII.1914. 
A few somewhat damaged specimens. Irregularly lumpshaped, 
a little flattened. Greatest extension of biggest specimen ca. 70 mm. 
Dermal membrane is wanting nearly everywhere; in places where 
it is found, it seems to be exceedingly thin and transparent. Os- 
cula tolerably frequent, ca. 2 mm in diameter. Ostia are seen very 
nicely in places where the dermal membrane is intact; very numer- 
ous, in this contraction-state 0,75 mm in diameter. Consistence 
tolerably elastic. Colour dirty grayish. 
In the skeleton distinet spiculo-fibres are found, with compar- 
atively mueh spongin, which, however, is difficult to see. It is the 
main fibres, which are well developed, with 5—6 or even more 
spicules side by side in a row; the mutual distance between the 
main fibres equals the length of ca. two spicules; the second- 
ary fibres, which connect the main ones in about right angles, and 
which are not so distinet, contain only 2—4 parallel spicules; be¬ 
sides, numerous spicules are distributed disorderly in the choano- 
some, particularly where the spiculo-fibres intersect one another. 
No separate dermal skeleton is to be made out. 
Spicules: (fig. 4) oxea, 130—170 p by 8 p. Slightly bent in 
the middle; thickness almost the same over the greatest part; 
spicule tapering to an apex, not always very sharp; some spicules 
