478 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



grooves. Top has radial ridges terminating in the lobes. Gonothecae 

 attached below hydrothecae, one or two near base of branches, or 

 a series decreasing in size distally or otherwise arranged. Female gono- 

 thecae with gonophores filling the cavity containing about forty eggs 

 arranged around a lumen (Figure 27). The male gonothecae similar 

 (Figure 25). 



I examined the structure of the stem by macerating it in caustic 

 potash. Twenty tubes occur near the base of a small colony and four 





26 

 Figures 25-28. Sertularella speciosa. 



Figure 25. Male gonotheca (X 30). 

 Figure 26. 

 Figure 27. 

 Figure 28. 



Female gonotheca ( X 30). 

 Female gonotheca ( X 30). 

 Part of branch (X 22). 



near the top. They extend for various distances upward to terminate 

 by joining others. The rhizoids consist of tubes which themselves 

 unite near the base of the colony much as do the former. In each 

 colony there is one large hydrothecae -bearing tube which gives rise to 

 the pinnae of one side near the base and further up for both sides. It 

 arises from a union of other tubes near the base of the colony and 

 traverses the entire stem. Pinnae on the side opposite the large tube 

 arise from tubes which become hydrothecae-bearing for a short distance, 

 give off two or three other branches, and then terminate in a tapering 



