135 
ones, length ca. 50 ; both forms are straight or slightly curved, very 
thin, thickest in the middle (the bigger ones 1—2 ^n). 
Tedania placentaefor mis nov. sp. 
Carnley Harbour. 45 f. Sandy clay. 6 XII.1914. 
Fig. 16. Tedania placentaeformis, nov. sp. a. styli; b, strongyla ; c, tylota ; d, rhaphides. 
Two specimens; flattened roundish shape, greatest extension 
ca. 35 mm, thickness ca. 10 mm. Surface even, spicules do not 
pierce the dermal-membrane, which is pellucid rather tough and thick; 
the subdermal-cavities are seeri through it; they have the form 
of streams with irregular courses, and as the dermal-membrane 
is sunk a little into them, the surface of the sponge appears very 
characteristically furrowed. Oscula? ostia? Colour whitish-gray. 
