PLATE VIII. 



Fig. 1. Thuiaria similis. Part of colony with gonophore and hydrothecae 

 showing tendency to elongation. * * 

 2 and 3. Portions of colony showing further elongation of hydrotheea?. 



4. Portion of colony with usual arrangement of hydrotheea^. 



5. Portion showing a more alternate arrangement. 



6. Portion with hydrothecse so alternate as to be similar to that 



described by Hartlaub as Sertularella nana. 



