Mr. W. S. Kent on two new Siliceous Sponges. 221 
ment of the interior of one of these bodies, detached and 
still further magnified ; but it furnishes nothing more towards 
the interpretation of their true significance*. The next part 
demanding attention is the cortex, the appearance of which in 
longitudinal section is illustrated in fig. 13, consisting exte- 
riorly of an irregular and somewhat coarse network of spicula, 
but having on its interior surface even reticulated laminz of 
15, and in the groundwork of fig. 
being necessary to create a new genus for the reception 
of this form also, I propose to distinguish it by the name of 
Fieldingia, in honour of my compagnon de voyage, Mr. Edw. 
Fielding (to whose skilful pencil we are especially indebted 
or numerous telling sketches of the lovely scenery through 
Which we passed), adding the specific one of /agettoides, after 
the lace-bark tree, in reference to the delicate reticulated 
lamine associated with the cortex, which are so strongly 
* My friend Prof. Perceval Wright, to whom I have had the oppor- 
tunity of exhibiting specimens of these curious bodies, was struck wi 
their resemblance to the “xanthidia” found in flint—a suggestion I hope 
at some future time to follow up. 
