34 ANTENNOPSIS. 
Genus ANTENNULARIA Lamarck. 
Antennularia simplex. 
IP), NEXT tegs, 12. 
Trophosome. — Hydrocaulus attaiing a height of about three inches, 
simple; verticils closely set, each composed of about five ramuli; ramuli 
borne each on a stout process from the stem, and composed of long, 
nearly equal internodes, every internode carrying a hydrotheca near its 
proximal end. Hydrothec small, campanulate, flanked on each side by 
a short tooth-like process from the internode. Supracalycime nemato- 
phores borne on the tooth-like processes; two mesial nematophores on 
each internode, one at the proximal and another at the distal side of 
the hydrothece ; a pair of nematophores borne on the basal process and 
single nematophores scattered over the common stem. 
Gonosome not known, 
Off Alligator Reef, from a depth of 86 fathoms. 
The present species comes very near to Antennularia ramosa, from 
which, however, it differs in its simple habit, and in the position of 
the hydrothecx, which are here situated further towards the proximal 
end of each internode. 
ANTENNOPSIS Atiman nov. gen. 
Generic CHaracter. Trophosome. — Stem jointed, sending off scattered 
jointed ramuli which carry the hydrothecs. Hydrothece with entire 
margin, unilateral, associated with a pair of movable supracalycine nemato- 
phores and with movable azygous nematophores borne along the hydrothecal 
side of the ramuli. 
Gonosome. — Gonangia not protected by corbule or other appendages. 
The genus Antenuopsis differs from Antennularia, to which it is closely 
allied, by the scattered disposition of its ramuli, which in Antennularia 
are verticillate. 
In all the species of Antennularia which I have examined, the cceno- 
sarc is canaliculated in the stem, the hydrosomal cavity beimg there 
represented by a network of intercommunicating canals. In Antennopsis 
hippuris the hydrosomal cavity is of the ordinary simple type, but we do 
not yet know enough of the species which may compose the genus 
Antennopsis to enable us to regard this as a true generic character. 
