[39] 



MEDUSAE FROM THE GULF STREAM. 



965 



as follows: A. Olienii has a rigid, untwisted axis (polyp-stem), tMclc 

 covering scales, the distal ( unattached edges) formed of faces, which for; ; i 

 the sides of the animal below the nectocalices ; horn-shaped continu;;- 

 tious of thecavity of nectocalyx into the prolongations which embrace tllc^ 

 stem. A. elegans has flexible stem (twisted), side of the animal below 

 the nectocalices formed by the uj)per faces of the thin covering scale: . 

 No horn-shaped diverticula from cavity of the nectocalyx. If there is 

 formed a new generic name it should not be made for A. OJcenii, but 

 for A. elegans or AgaJmopsis elegans, Sars (one form). I cannot accept, 

 therefore, Hreckel's new name, Grystallodes. If a new name is sought 

 for (Agalma, Leuck, mihi) Agalmopsis, Sars (one form), it cannot be 

 Agalmopsis, since the "first form" of Sars is not Agalma, in the sense 

 used by Eschscholtz, but a different medusa. Stephanomia, Hux., is the 

 first form of Agalmopsis, Sars. The question is reduced to this consid- 

 eration : Is Agalma Olcenii and A. elegans ("one form," Sars, mihi) geu- 

 erically distinct? If they are, a new generic name must be given to 

 A. elegans. If Agalmopsis is adopted for it, the "first form," Sars, is 

 eliminated and is without name. Huxley says that his Stephanomia is 

 generically the same as Sars's first form. I have thought the best way 

 out of the complication is to let Agalmopsis stand for Sars's "first form," 

 Agalma. for another (A^/ai/wd, mihi), Stephanomia, M. E., for the medusa 

 described by Kolliker as Forskalia. If the characters of A. elegans and 

 A. Olienii are generic, a new name, Agalmoides, may be proposed fur 

 Agalma Sarsii, Agalma elegans, Few., and Agalmopsis elegans ("one 

 fofra"), Sars. In the present paper these are all regarded as generic 

 ally identical. Nanomia cara, A. Ag., is regarded as the same as the 

 "first form" of Sars and may be called Agalmopsis carum. 



Agalmopsis fragile,* Fewkes. 

 Key West, Florida. 



Athoeybia FORMOSA, Fewkes. 

 Tortugas, Florida. 



Haliphyta magnifica, Fewkes. 



Apolemia, sp. (provisional). 

 Off Block Island. U. S. F. Com., 1880. 

 * By an error written gracile on p. 266, Bull. Mus. Comp. Zool., vol. ix, No. 7. 



