HYALONEMA (LEPTONEMA) CAMPANULA. 
245 
having no smaller kind of macramphidiscs, no mesamphidiscs, and no spheres, 
and by the distal ray of its pinules being more slender, and its microhexactines 
much larger. Although these differences are very conspicuous and quite suffi- 
cient for specific distinction, there is a considerable degree of similarity between 
the two. 
LEPTONEMA, subgen. nov. 
Species of Hyalonema the amphidiscs of which have hyperbolic, hemispheri- 
cal, or bell-shaped terminal anchors about one fourth to one third of the whole 
spicule in length. Without amphidiscs of any other kind. The largest amphidiscs 
are slender and have a thin shaft. 
The collection contains one specimen of this subgenus. 
Hyalonema (Leptonema) campanula, sp. nov. 
Plate 81, figs. 1-26. 
A single specimen of this species was trawled in the Southern Tropical Pacific 
at Station 4721 on 15 January, 1905; 8° 7.5' S.; 104° 10.5' W.; depth 3811 m. 
(2084 f.); it grew on light brown Globigerina ooze. 
The terminal anchors of the macramphidiscs are slender and similar to the 
flowers of certain species of Campanula. To this the name refers. 
Shape and size. The specimen (Plate 81, fig. 15) is somewhat fragmentary. 
What there is of the body is an irregular mass, 18 mm. in diameter. It is drawn 
out to a conical protuberance in one place, and from this arises a curved stalk 
70 mm. long and about 1 mm. thick. 
The colour of the body in spirit is brown. 
The skeleton consists of pentactine and diactine pinules, pentactine, hex- 
actine, and diactine megascleres, modified basal spicules, stalk-spicules, microhex- 
actines, and amphidiscs. The diactine pinules are associated with ordinary 
diactine megascleres. Protruding freely they probably formed together with 
these spicules a fringe at the boundary between the dermal and gastral parts of 
the surface. Some of the pentactine pinules have a very long distal ray; in 
others, which appear to be confined to the basal part of the sponge, the distal 
ray is of ordinary length. The acanthophores are for the most part diactine and 
pentactine. The amphidiscs are of three kinds, macramphidiscs, mesamphidiscs, 
and micramphidiscs. The macramphidiscs are very abundant, the other two 
rather rare. 
