178 DEPARTMENT OF THE NATAL SERVICE 



Genus Antennularia. 



Trophosome. Hydrocladia arrang-ed in whorls or scattered over the stem. 

 Gonosome. Gonangia unprotected. 



KEY To SPECIES. 



a Proximal hydrothecaj not divided from stem by nodes. 

 h Proximal hydrotheca? divided from stem by two nodes. 



A. americana 

 A. antennina 



Antennularia amcricnna Nutting. 



Trophosome. Stem slender, hydrocladia usually 

 in whorls of four; proximal hydrothecse on a long pro- 

 cess from the stem, one or two intermediate internodes ; 

 between each two succeeding hydrothecate internodes; 

 hydrothecae cup-shaped; two nematophores above the 

 hydrotheca, one below, two on the intermediate inter- 

 nodes, two on the shoulder that supports the hydro- 

 cladium, cauline nematophores scattered. 



Gonosome, (jonangia borne at the base of the 

 hydrocladia, oblong-oval, aperture latero-terminal. 



No. ;o3. 

 Antenniilaria americana. 



Antennularia antennina (Linnaeus). 



Trophosome. Stems cluvstered, slender; hydro- 

 cladia whorled, short, incurved; internodes alternating 

 with and without hydrothecae, the former nearest the 

 stem; hydrothecae cup-shaped; nematophores similarly 

 placed to those in A. am,ericana. 



Gonosome. Gonangia produced singly, in the axils 

 of the hydrocladia, obovate, with latero-terminal aper- 

 ture. 



No. 1 

 Antenntolaria 



Genus Cladocarpus. 



Trophosome. Hydrothecae deep with the margin smooth or with low, blunt teeth; 

 mesial nematophores short. 



Gonosome. Gonangia borne on the stem, at the base of the hydrocladia, pro- 

 tected by processes (phylactogonia) springing from the base of the hydrocladia ; these 

 have nematophores but no hydrotheca?. 



KEY TO SPECIES. 



a Hydrothecae without teeth. C. pourtalesi. 



h Hydrothecae with two large, rounded, anterior teeth and shallow lateral teeth. 



C. speciosus. 



