AGLAOPHENTA RIGIDA. 43 
situated near the bottom of the hydrotheca. Supracalycine nemato- 
phores scarcely overtopping the hydrotheca; mesial nematophore adnate 
to less than half the height of the hydrotheca, and with a short, free 
extremity; cauline nematophores two on front of each internode of the 
stem, one of these close to the axil of the pinna, and the other near to 
the proximal end of the internode. 
Gonosome not known. 
Off Carysfort Reef, from a depth of 52 fathoms. 
This species comes very near to Aglaophenia rigida in the form of 
its hydrothecw. The hydrothecal internodes, however, are longer and 
narrower than in that species. A. rigida, moreover, is a much more 
ramified and a taller form. 
Aglaophenia rigida. 
Pl. XXV. Figs. 5-9. 
Trophosome. — Hydrocaulus attaining a height of about nine inches, 
springing from a mass of tortuous filaments, non-fascicled, slender, wiry, 
much branched towards the distal ends of the stems; branches given 
off from a point on the anterior side of the stem, from which they 
frequently spring in pairs; pinne alternate, springing from a point 
a little below the distal end of each internode; hydrothecal inter- 
nodes short, each with two short septal ridges. Hydrothece closely set, 
deep, slightly widening towards the orifice, and with strongly toothed 
margin. Supracalycine nematophores slightly overtopping the hydro- 
theca; mesial nematophore adnate to about half the height of the 
hydrotheca and terminating in a short, free extremity. 
Gonosome. — Corbulz completely closed, long, nearly cylindrical, with 
about fourteen ridges rising into slightly prominent crests; denticles of 
ridges cup-shaped, with the basal one in the form of a tubular diver- 
gent spur. 
Off Cape Fear, from a depth of 9 fathoms. 
The pinnz appear to be easily detached in this species, for most of 
the specimens were nearly destitute of them, and presented little more 
than a cluster of long, naked, wiry stems. 
The ramification is peculiar, the branches springing from the anterior 
side of the stem, where each is usually accompanied by a second from 
