BULLETIN OF THE 
HIPPURELLA, ALLMAN. 
The genus Hippurella was founded by Allman for those hydroids in which 
the proximal ends of the branches are pinately branched, while the distal end 
of the same bears verticillately arranged branches. Allman speaks of the last 
as if they were the same as the pinnæ. They are, however, destitute of hydro- 
thecæ, and simply bear a row of nematophores. Their function is the protec- 
tion of the gonophores, which are confined to this region of the hydrosome. 
Hippurella annulata, Arr. 
Trophosome : — Hydrocaulus six to eight inches tall, for two thirds its 
length without branches, Branches alternate, bearing ultimate ramuli. Base 
of hydrocaulus developed into disk-shaped hydrorhiza. Stem fascicled. Pinne 
opposite, although those of opposite sides do not lie in the same plane. Inser- 
tions of pinnæ alternate. Hydrothecw separated from each other on the stem. 
In the interval between two hydrothecæ, there are four or five partially formed 
annulations. Mesial nematophores free, long, and two in number. Margin of 
the hydrotheca smooth and circular. Supracalycine nematophore overtopping 
the orifice, A single ultimate branch, or pinna, arises from the main stem. 
Gonosome :— The distal extremity of the branch is modified into a gono- 
some. The proximal end of each branch bears pinne regularly arranged as 
described.” Those on each side lie in one and the same plane. They pass with- 
out great modification into the verticillately arranged ribs of a gonosome at the 
distal end of the branch. The ribs which compose this gonosome are undi- 
vided, and without branches. Each verticil is composed of six ribs of equal 
size and shape. At the base of the verticil, in the angle which the ribs make 
with each other, there is a single nematophore. "The ribs arise at right angles 
to the stem, and at a short distance from their origin curve upward. Near this 
bend they bear a pair of nematophores, one on each side, while higher up in 
their course the ribs bear single rows of nematophores. Gonophores seated in 
the interval between successive verticils of these ribs. 
/ Bt. Vincent, 124 fms. 
CALLICARPA, n. g. 
Callicarpa differs from all the other genera of hydroids yet described in the 
character of the gonosome. The gonosome resembles closely a spike of wheat, 
and springs by a short, peduncle immediately from the main stem. It is mor- 
phologically speaking as if the proximal part of the branch which bears pinnæ 
in Hippurella was reduced to a peduncle, and the distal end with its verticillate 
ribs became the gonosome. 
Callicarpa gracilis, n. s. 
Trophosome : — Hydrocaulus rising to the height of six inches from a tan- 
gled mass of filaments which form the base of attachment. From a point about 
