34 AKTENNOPSIS. 



Genus ANTENNULARIA Lamarck. 



Antennnlaria simplex. 



PL XXI. Figs. 1, 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. Hydrothecfe 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 hydrothecre ; 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 Anteimularia ramosa, from 

 which, however, it difiers in its simple habit, and iu the position of 

 the hydrothecoe, which are here situated further towards the proximal 

 end of each internode. 



ANTENNOPSIS Allman nov. gen. 



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

 jointed ramuli which carry the hydrothecfe. HydrothecsB with entire 

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

 phores and Avith movable azygous nematophores borne along the hydrothecal 

 side of the ramuli. 



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



The genus Anteniiopsis 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 by a network of intercommunicating canals. In Antennopsis 

 hippiiris 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. 



