133 
0 / 
Although it is most natural, in 
my opinion, to place Toxochalina 
amongst the Chalininae, I here still 
refer it to the Gelliinae which I 
find most practical. As well known, it 
is impossible to find a usable limit 
between ‘greater’ or Messer’ amount 
of spongin, while the diagnosis “mi- 
croscleres present” and “microscler- 
es absent” is an absolute distinction, 
and therefore practical. Sooner or 
later the genus, however, will be 
included among the Chalininae; we 
often see that microscleres appear 
in separate groups independent of 
one another, groups in which the primordial forms all are devoid 
of microscleres. But as yet it would be to break up the well de- 
fined Chalinine-group, if we include in it the genus Toxochalina. 
4 . 
Fig. 14. Toxochalina difficilis, nov. sp. 
a, oxea and strongyla; h, Toxa. 
! Genus Tedania, Cray. 
i Tedania diversi*rhaphidiophora nov. sp. 
Carnley Harbour, 45 f. Sandy clay. 6/XII.1914. 
, Specimens in hånd are incrusting, lump- or cakeshaped; body 
I of attachment shells. Biggest specimen ca. 45 mm. Appearance 
very characteristic: surface undulating; from the base of the sponge 
outwards runs a row of low (fraction of a mm) and narrow (ca. 
one mm) mounds, separated from one another by valleys of cor- 
responding dimensions; in some places they are running nicely 
parallel, so as to f 6 rm a system resembling ripplemarks; in other 
places their course is quite irregular; in such places very low 
warty prominences are built up, ca. 2—3 mm in diameter. The 
above mentioned external structure is due to the contracted State 
of the sponge (preserved in alcohol), so that the valleys are formed 
by the dermal-membrane sunk down into the underlying subdermal- 
canals. Oscula (and ostia?) very numerous, V 4 — 1 mm in dia¬ 
meter. Dermal-membrane thin and pellucid. Surface even, in some 
places however hispid, when the spicula-tufts have pierced the 
t 
