CAMPANULAEIAE 



109 



1. ANTENNULASIA Lamarck. Main stem of colony simple or 

 sparsely branched and attached by a massive hydrorhiza; hydrotheca cup- 

 shaped; gonangia borne in the axils of the branches: 6 American 

 species. 



A. antennina (L.) (Fig. 180). Colony a dense cluster of upright 

 stems, often 20 cm. high, obscurely jointed, each internode bearing a 

 whorl of fine branches (hy- 

 drocladia) on which are the 

 hydranths and the nemato- 

 phores; gonangia ovate and 

 of large size, in the axils of 

 the hydrocladia: from Mar- 

 tha's Vineyard to Bay of 

 Fundy in 6 to 60 fathoms; 

 Europe. 



2. MoNOST-ECHAS All- 

 man. Colony branching 



dichotomously and attaining a height of 15 cm.; hydrocladia spring- 

 ing all from the upper side of the main branches: 1 American 

 species. 



M. quadridens (McCrady). From Martha's Vineyard southwards. 



3. SCHIZOTRICHA Allman. Colony usually a cluster of simple stems; 

 hydrocladia arranged pinnately and branched in mature specimens: 

 4 American species. 



S. tenella (Verrill). Colony branching dichotomously and attain- 

 ing a height of 5 cm.; stem divided alternately into longer and shorter 



Fig. 180 Antennularia antennina (Nutting), 

 hydranth ; 2, nematophore ; 3, gonangium ; 

 4, hydrocladium. 



Fig. 181 



Fig. 182 



Fig. 183 



Fig. 181 Schizotricha gracillima (Nutting). Fig. 182 Cladocarpus flexilis (Nut- 

 ting). Fig. 183 Halecium halecinum (Hargitt). 



internodes, the latter bearing each a hydrocladium; gonangium cornu- 

 copia-shaped : Long Island and Vineyard Sounds, in shallow water, often 

 on piles. 



