30 Natural History Bulletin. 



Among the worms found on the .sea weed, the mo:.t abund- 

 ant was a Spirorb/s. which thickly dotted the ohve surface 

 with its minute spiral shells. 



But the hydroids furnished the most interesting, or at least 

 most beautiful, animal forms fovmd inhabiting the gulf weed. 

 Campanularians predominated, four very distinct species being 

 found, several of which seemed to be new. Fortunately the 

 reproductive buds, or gonophores, were present in each case. 

 Perhaps the most interesting campanularian was one character- 

 ized by its green color. This was the iirst green hvdroid 

 which had been seen by any one on board; of course we except 

 the fresh water Hydra vii-id/s. A microscopic examination 

 showed that this color was apparently due to the presence of 

 chlorophyl. which seemed to be a part of the animal itself, as 

 in Hydra z'/r/d/s. and not an alga which is parasitic, such as is 

 described by Cienkowsky. Ilertwig. Brandt and Geddes.^ The 

 distribution of these chlorophyl bodies seemed to be uniform 

 throughout the bodies and tentacles of the hydranths. as well 

 as in the pedicels. Of course no physiological test was avail- 

 able to positively prove the nature of the green cells, but there 

 w'as no ocular difference discernible between them and true 

 chlorophyl bodies. The reproductive organs were enclosed 

 in flask-shaped gonangia, having a collar and lid. The 

 hydranth of this remarkable campanularian has a disk-shaped 

 proboscis borne on a short, rather slender pedicel, and sur- 

 rounded by twenty or more tentacles. 



Of the remaining species, two are apparently new (\iin- 

 pamilaria. One has a gonangium which is shaped like a 

 Chinese lantern and contains a single planoblast borne on a 

 blastostyle, and filling the entire gonangium. Obclia Iixal/iia 

 is another very beautiful hydroid found at this time attached 

 to the gulf weed, its graceful branching form and triangular 

 calicles making it particularly elegant in appearance. Two 

 species of plumularian hydroids were also found attached to 

 the sea weed, one being Ai>-Jaophcuia in/'iuita Fewkes. grow- 

 ing in the shape of delicate plumes, fairly covering the 



1 "Tlnce Cruises of tlic Ijlakc," jKigc 211. 



