470 
Lissoplocamia nov. gen. 
Plocamiae with a reticulation of smooth dumb-bell shaped 
spicules building the main skeleton, and smooth styli echinating 
from the surface of the sponge. Microscleres toxa. 
I propose to regard the following very characteristic and inter- 
esting species as the type of a new genus; all the hitherto described 
Plocamia-species have spined megascleres; I therefore think it con- 
venient to create a new genus for species with smooth megascleres. 
I am inclined to regard the sponge as a degenerate Plocamia. 
Lissoplocamia prima nov. spec. 
(Fig. 22 a—d.) 
2 miles East of North Cape. 55 fathoms. Hard bottom. 2/1.1915. 
One specimen, siender, cylindrical, richly branched, ca. 260 mm 
longj 4—8 mm thick. Very characteristic is the beautiful velvet 
