454 
Pachychalina conica nov. spec. 
(Fig, 12.) 
Slipper Isl. The coast, at low water. 20/XII.1914. 
Several fragments consisting of irregular, cylindrical branches, 
sometimes fused into one another. 8—18 mm in diameter, largest 
dimension in length ca. 50 mm. Dermal-membrane exceedingly 
fine and delicate, with numerous small ostia; oscula ca. 2 mm in 
diameter, with a mutual distance of ca. 8 mm; they are situated 
on small conical elevations leading into the cylindrical cloacal ca- 
vities of the same width. Colour yellowish, texture soft, elastic; 
surface smooth, but not quite glabrous. 
Fig. 12. Pachychalina conica nov. Fig. 13. Pachychalina af- 
spec. Variously endeel Oxea. finis nov. spec. Oxeole. 
Skeleton consists of spongin-fibres building a network with rather 
irregular meshes; the spongin is very pale; it contains the spicules 
which are generally completely enveloped therein; they are lying 
rather densely, overlapping one another, 1—5 or 6 in the row; 
one can scarcely speak of main and connecting fibres, though as 
a matter of faet, the fibres running towards the surface, taken as 
a whole, are a little heavier than the other fibres; the meshes 
are from ca. 15 y to ca. 55 /li broad. No special dermal-skeleton 
is to be seen. 
Spicules. Oxea (fig. 12), of a peculiar form, slightly curved, 
thickest in the middle; the apices are more or less conically set 
off. Some strongyla of the same dimension as the oxea are found. 
Ca. 130 X 12 
