Notes on Medusa; of the Western Atlantic. 147 



which is so characteristic of the genus, and flaring also at the distal end 

 into a trumpet-shaped closure for the capsule. 



Only two of the hydroids that were seen showed anything of value as to 

 the reproductive process. In these, two medusa buds were developing upon 

 the blastostyle within the gonotheca. Both were more than half-way out on 

 the blastostyle, and behind the smaller, more proximally situated bud there 

 was no sign of more progeny ready to begin growth. 



The bud farther from the base of the capsule was about twice as far along 

 in the matter of size and development as was the younger individual. It 

 was my misfortune to be unable to find specimens in later stages of growth 

 than that of the older bud represented in the figure. No free medusae were 

 taken in the tow-net, which was plied patiently in the waters of the moat, 

 so that the specific characters of the mature jelly-fish can not be described 

 at this time. 



There were, in the specimens observed, four radial canals fully developed, 

 each one ending in a large cushion of ectodermal tissue, evidently the basal 

 enlargement, possibly sensory in function, which the tentacles of Campanu- 

 larian medusae always carry at the point of emergence from the bell-margin. 



The nearly spherical shape of the medusa buds should be mentioned as 

 a point in contrast with the very long buds which are found in the capsules 

 of some of the Campanularidae. 



Comparison of characters of Campanularia macrotheca with tlwse of other species 



nearly related to it. 



Habitat. The specimens here described were all found in the moat of 

 Fort Jefferson, Tortugas Islands, Florida. The stolons were found creep- 

 ing upon the same filamentous alga upon which the hydroids of Cladonema 

 were growing. 



The above species differ in the matter of habitat as well as in morpho- 

 logical characters. The habitat of C. raridentata is given by Hincks as 

 " other zoophytes and on corallines, between tide marks." The two other 

 species given in the table have the same habitat. 



1 Alder, J. A catalogue of the Zoophytes of Northumberland and Durham. Trans. 

 Tynes. Nat. F. Club, 1857. 



"Agassiz, A. 1862. Contrib. Nat. Hist. U. S. 



