455 
•i Pachychalina affinis nov. spec. 
i (Fig. 13). 
i 
; Little Barrier Island. 30 fathoms. Shellground. 29/XII.1914. 
Colville Channel. 35 fathoms. Sand, mud. 20/XII.1914. 
I 
Three specimens, the one very beautiful; copiously ramified 
with cylindrical branches, total length ca. 420 mm, diameter of 
branches ca. 8 mm. Numerous oscula on a level with the surface, 
1 —1,5 mm in diameter, occurring mainly on one side of the bran¬ 
ches, although some may be found on the opposite side. Texture 
tough, elastic. Colour (formaline) yellowish grey. 
^ The main skeleton consists of a rather dense reticulation of stout 
spongin-fibres, of a thickness of about 60—80 //; this holds good 
for both primary and secondary fibres; the only difference between 
the two sorts of fibres being that of the spicules enveloped in the 
fibres: the oxea are polyserially arranged in the main fibres, 
I mono- or biserially in the secondary fibres. The meshes are toler- 
ably rectangular, width about 500 [i. The primary fibres are run- 
j ning perpendicularly towards the surface, so that in a transverse 
, section of the sponge they roughly resemble spokes in a wheel. 
The dermal-skeleton forms a more irregular network of fibres, 
which are, as a whole, a little narrower than the fibres in the 
» 
main skeleton, and always with only uni- or biserially arranged 
oxea. 
Spicules. Oxea (fig. 13), about 70X6//, cylindrical, with rather 
sharply set, pointed apices. 
This species comes very near to Euchalina exigua Lendf. 
• (Dendy 4 & 7); it differs from that species in having slightly 
stouter fibres {exigua 40 y), larger diameter of the meshes {exigua 
100 //), and the spicules somewhat shorter but thicker {exigua 90 
X2 //). It is also related to Chalina ramosa Cray, which forms, 
' together with Euchalina exigua Lendf. and Pachylina elongata Ridi. 
and Dendy, a little group of nearly allied species. 
I . Pachychalina lunae nov. spec. 
(Fig. 14.) 
t 
Halfmoon Bay, Stewart Island. The coast. 19/XI.1914. Puhoi 
Rock, Hauraki Gulf. The coast, under stones. 29/XII.1914. 
Three specimens; only fragments, which are of irregularly 
I 
