CONGDON. — THE IIYDROIDS OF BERMUDA. 



473 



Trophosome. Colonies delicate and graceful, with hyaline or brown- 

 ish perisarc, usually twenty to thirty-five millimeters long, main stem 

 and large branches fascicled in part, elsewhere slightly geniculate 

 (Figures 16, 17). Branches irregularly placed, arising from below hy- 



FiGDRES 16-20. Halecium bermudense. 



Figure 16. Colony (X 4). 



Figure 17. Tart of a colony (X 24). 



Figure 18. Female gronotheca (X 27). 



Figure 19. Compound hydropliore (X 30). 



Figure 20. Male gonotheca (X 27). 



drophores, when young, by an abrupt curve, which later is less appar- 

 ent ; occasionally, toward the end of larger branches, arising midway 

 between hydrophores. Branches may twice subdivide. They tend to 

 form a cluster at the tip of the colony. 



Hydrophores alternate, very shallow, with usual ring of refractile 



