New Zealand Porifera — BERGQUIST 
43 
let, in spirit whitish. The skeleton is an irregular 
reticulation of fibres cored and quasi-echinated 
by main styli (often subtylostylote ) of two 
sizes. Auxiliary subtylostyli of two sizes present. 
Dermal skeleton is a tangential layer of larger 
subtylostyli echinated by a palisade of smaller 
subtylostyli. 
Spicules. Megascleres: (a) main styli (2 
sizes) : .32 to .35 X .013 to .014 mm.; .2 to .24 
X .007 to .011 mm.; (b) auxiliary subtylostyli 
(2 sizes) : .28 to .34 X .007 to .011 mm.; .14 to 
Fig. 14. a, Suberites cupulotdes , sp. nov. b, Suber- 
ites cupulotdes . tylostyli (X 350 ). 
Fig. 15. a, Isociella incrustans, sp. nov. b, Isociella 
in crust arts, styli, subtylostyli, isochelae (X 350). 
.23 X .003 to .006 mm. Microscleres: palmate 
isochelae .011 to .014 mm. chord. 
GENUS Polymastia (Bowerbank) 
Polymastia fusca, sp. nov. 
Fig. 16^, b 
OCCURRENCE: Burgess Bay, Kawau Island, 
under rock ledge. Ahipara Bay, under rock ledge. 
Spirits Bay, under rock ledge. 
DESCRIPTION: A massive, spreading sponge, 
with numerous low wartlike papillae. Surface is 
even and minutely hispid. The oscules are small, 
apical on the papillae. The texture is firm and 
