PLATE IV. 



Fig. 1. Halecium 'pygmcEum. Colony made up of several stem joints show- 

 ing position of gonangiuro. 



2. Colony consisting of a single joint showing large female gonophore. 



3. Lictarella Carolina. Part of a branch showing hydrothecge and 



nematophores. 



4. Terminus of one part of the polysiphonic stem. 



5. Portion of a polysiphonic stem. 



