34 ANTEXXOPSIS. 



Genus ANTENNULARIA Lamaeck. 



Antennularia simplex. 



PI XXL Figs. \, 2. 



Trophosome. — Hydrocaulus attaining 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. Hydrothec99 small, campanulate, flanked on each side by 

 a short tooth-like process from the internode. Supracalycine 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 hydrothecae ; 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 hydrothecae, which are here situated further towards the proximal 

 end of each internode. 



ANTENNOPSIS Allmax nov. gen. 



Generic Character. Trophosome. — Stem jointed, sending off scattered 

 jointed ramuli which carry the hydrothecae. Hydrothecae with entire 

 margin, imilateral, associated with a pair of movable supracalycine nemato- 

 phores and with movable azygous nematophores borne along the hydrotheca! 

 side of the ramuli. 



Gonosome. — Gonangia not protected by corbulae or other appendages. 



The genus Antennopsis 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 coeno- 

 sarc is canaliculated in the stem, the hydrosomal cavity being there 

 represented l)y a network of intercommunicating canals. In Antennopsis 

 hippnris 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 chai-acter. 



