On a Parasitic Sponge. By Prof. P. Martin Duncan. 383 



that order, and in both of the great divisions of it cstabHshed 

 by Haeckel ; but all such sponges are attached, and are not 

 parasitic. 



There are no tubules in the delicate tissue of the sponge, and 

 I regard the whole as one of the composite Ascones modified for a 

 parasitic life, and have named it after the discoverer of its host — 

 M6bimis])o ng ia ixirasit ica. 



