468 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



Genus OBELIA Peron and Leseur, 1809. 

 Obelia hyalina S. F. Clarke. Figures 7-9. 



Obelia 



Figures 7-9. Ohelia h)/nlina. 



hi/alma grows on 

 sponges, algae, and large hy- 

 droids which inhabit the shallow 

 waters of Bermuda (Figures 7, 8). 

 Stems and branches may develop 

 short stolons. The branches are 

 described by Clarke as arising 

 from the axils of hydrothecae. 

 I found them more commonly 

 resulting from the extension of 

 pedicels. The gonothecae which 

 Clarke found were evidently 

 immature, since they are fig- 

 ured with a truncate end. Later 

 these develop a small aperture 

 surrounded by a flaring rim 

 (Figure 9). 



Figure 7. 

 Figure 8. 

 Figure 9. 



Colony (X 3). 

 Colony (X :50). 

 Gonotheca (X CO). 



Genus CAMPANULARIA 

 Lamouroux (in part) 1816. 



Campanularia insignis 

 AUman. Figures 10-12. 



The animal lives in all the 

 localities along the shores of Ber- 

 muda where hydroids are plen- 

 tiful. The trophosome (Figure 

 10) was described by Allman 

 from a dredging of the Challenger 

 expedition in thirty fathoms of 

 water off the coast of Bermuda. 

 I have to add a de^ription of 

 the gonosome. 



An interesting character not 

 to my knowledge elsewhere found 

 in the genus Campanularia, is the 

 vegetative reproduction through 

 the agency of stolons, much as 

 takes place in plants by creepers 



