MUSEUM OF COMPARATIVE ZOOLOGY. 131 
Aglaophenia insignis, n. s. 
A. insignis resembles A. gracilis more closely than it does any other species 
of the genus. It differs from it in that the mesial, adnate nematophore pro- 
jects almost at right angles to its hydrotheca. This nematophore is not as 
long as the mesial nematophore of 4. ramosa. The corbula is short and thick, 
different in shape from that of A, rhyncocarpa and A. rigida, 
Trophosome : — Hydrocaulus three inches high, branching, non-fascicled, with 
nematophores on the stem. Hydrorhiza creeping. Branches spring from oppo- 
site sides of main stem, but they are not exactly opposite in position of origin. 
Hydrothecæ closely approximated, short, stout, with the margin toothed, Su- 
pracalycine nematophores rise slightly above the orifice of the hydrotheca. 
Mesial nematophore adnate part of its length, and with the remainder extend- 
ing at right angles to the surface of the hydrotheca. Ultimate ramuli borne 
on main stem as well as branches. 
Gonosome : — Corbula short, stout, closed, bearing a hydrotheca on the 
peduncle. The nematophores borne on outer walls of the corbula in rows, with 
each nematophore long, tubular, and tapering slightly to a terminal opening. 
The number of nematophores in each row is six or seven on each side, Num- 
ber of ribs, four and five. Peduncle of each corbula, short. 
Grenada, 262 fms. 
Aglaophenia gracilis, Arr. 
An Aglaophenia, which resembles A. gracilis in size and shape of hydrotheca, 
has a corbula like that of A. rigida. The only differences which Allman points 
out between these two species is that in A. gracilis “the hydrothecal internodes 
are longer and narrower” than in A. rigida, and A. rigida is a much “more 
ramified and a taller form.” Allman says of A. gracilis, * Gonosome wanting.” 
In the hydroid, which has been identified as 4. gracilis, there is a corbula 
which resembles that of 4. rigida. A. gracilis and A. rigida may be the same 
hydroid. 
Aglaophenia gracillima, n. s. 
Trophosome : — Hydrocaulus not branching, attaining a height of three 
inches, Non-fascicled. Upper part of hydrocaulus bearing denticle-like ne- 
matophores. Pinnæ alternate. Hydrotheca deep, swollen below; margin. 
with a medially placed tooth longer than the remaining dentition about the 
margin of the hydrotheca, A spur arises near the base of this tooth. Supra- 
calycine nematophores slightly overtopping the margin of the hydrotheca. 
Mesial nematophore with two openings, one terminal ; the other on side facing 
the hydrotheca.  Hydrothecæ closely crowded together, each arising from a 
joint of the pinna. 
Gonosome : — Corbula like that of A. lophocarpa in shape and size, but the 
distal end terminates bluntly in a single large nematophore, and not in a coni- 
