New Zealand Porifera— -Bergquist 
45 
Hancocks description. The spicules are identical 
in appearance, save that the oxea are faintly 
microspined; the measurements differ, however. 
CHILE 
NEW ZEALAND 
Tylostyli... . 
Oxea 
.18 mm. long 
.07 mm. long 
.1 to .12 X *003 mm. 
.052 to .07 X *003 mm. 
A difference between the present specimen 
and the holotype is the presence in the New 
Zealand sponge of small spiny microrhabds, .007 
X .002 mm. No mention is made of these in the 
holotype. Their distribution is, however, sparse 
and irregular; they themselves are inconspicuous 
and could easily have been overlooked. The holo- 
type had infested a shell of Monoceras fusoides , 
a species recorded for Chile only. Other species 
of Mollusca are common to Chile and New 
Zealand, and there is no reason to suppose the 
Cliona should not share this wide distribution. 
DISTRIBUTION: Chile. 
order CARNOSA (Carter) 
FAMILY HALINIDAE (de Laubenfels) 
subfamily CORTICIINAE (Vosmaer) 
GENUS Corticella (Sollas) 
Corticella novae-zealandiae, sp. nov. 
Fig. 17 a, b, c 
GENOTYPE: Corticum stelligemm Schmidt, 
1868, p. 25, pi 3, %. 6. 
Corticella stelligera Sollas, 1888, 
p. 281. 
OCCURRENCE: Rangitoto Island; sublittoral 
fringe. 
DESCRIPTION: An encrusting to massive and 
depressed sponge, its surface smooth but uneven. 
Oscules never apparent. The texture is firm and 
granular. Colour in life white, in spirit pale 
brown. 
Spicules , Megascleres: calthrops, rays .12 to 
.21 mm. X .026 to .038 mm. The number of 
rays may sometimes be multiplied to 5 and 6 
FlG. 17. a, Corticella novae-zealandiae, sp. nov. b, 
Corticella novae-zealandiae, typical calthrops (X 80). 
c, Corticella novae-zealandiae, strongylasters (X 350). 
and some can show a slight dicho modification. 
Microscleres: (a) strongylasters .011 mm. in 
diameter; (b) oxyasters, 5-7 rays .05 to .07 mm. 
in diameter. 
REMARKS: This specimen differs from the 
only other known species from the Mediter- 
ranean in the dimensions of the spicules. 
