TABLE 15 
194 
PACIFIC SCIENCE, Vol. XIX, April 1965 
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not be distinct from previously described mem- 
bers of Ancorina from this area. 
Levi (1958) has described a third species in 
Hezekia , H. arabica . It is possible that this 
sponge does lack asters; certainly it differs 
markedly from Ancorina acervus in details of 
speculation. If the opinion that lack of asters 
warrants generic separation is upheld, then H. 
arabica requires a new generic name. 
DISTRIBUTION: Wide In do Pacific distribu- 
tion. 
GENUS Stelletta Schmidt 
Stelletta durissima n. sp. 
Fig. 32 
OCCURRENCE: Sta. 64 (a single specimen 
designated as Holotype, USNM 23704). 
DESCRIPTION : A small flattened fragment, 
1.0 cm high, 1.2 cm wide, 0.5 cm thick, of 
what was presumably a simple, digitate sponge. 
The base of attachment is missing and there is 
no information as to the substrate. 
COLOR: In alcohol, grayish-white. 
TEXTURE: Crisp. 
SURFACE: Uneven, rough with the slightly 
projecting clads of the outer layer of triaenes. 
No oscules are visible, but a lateral pore area 
of approximately 1.0 X 1.5 mm is present on 
each side of the sponge. In this area the density 
of surface triaenes is greatly reduced and the 
skeletal pores are subdivided irregularly by fine 
whisps of collenchymatous tissue. 
SKELETON: The arrangement of the skeleton 
is typical of Stelletta, comprising radially dis- 
posed tracts of oxeas, slightly confused inter- 
nally and diverging toward the surface. There 
are two ranks of triaenes in both of which, 
plagiotriaenes predominate, although they are 
accompanied in each case by anatriaenes. The 
triaenes of the inner rank interdigitate with 
the endosomal oxeas and are frequently very 
short plagiotriaenes. 
Small cortical oxeas are mingled with the 
outer rank of triaenes; they are usually radially 
disposed but can occur scattered between the 
two triaene zones. The latter are separated by 
a region of subcortical cavities which marks the 
boundary between cortex and endosome. 
