18 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



in Buzzard's Bay and Newport Harbor ; these are : Turritopsis nutri- 

 cula, Margelis carolinensis, and Stoiiiotoca rugosa. But these northern 

 specimens of the two latter forms display distinct and constant color 

 differences which distinguish them from their near relatives in the 

 Tortugas, and probably entitle them to rank as varieties one of the 

 other. In addition to these three Hydromedusae, there is one Scy- 

 phoraedusa, Dactylometra quinquecirra, that is established in Tampa 

 Bay, Florida, and also in the bays and estuaries of the southern 

 coast of New England. It has not 3'^et been found at the Tortugas, 

 but, judging from its range of distribution, it probably will be discovered 

 there. 



There are a number of other characteristic Tortugas Acalephs that 

 may be classed as occasional visitors to the southern coast of New 

 England, upon which they are drifted by the agency of the prevailing 

 S.-S.W. winds of the summer months. None of these appear to suc- 

 ceed in establishing themselves permanently upon the New England 

 coast. Among these Hydromedusse may be mentioned, Eutima mira, 

 ^quorea floridana, Glossocodon tenuirostris, and Liriope scutigera ; and 

 among the Siphonophorse, Physalia pelagica, Velella mutica, Porpita 

 Linnseana, Diphyes bipartita, Eudoxia campanula, Ersa}a Lessouii, 

 Diphyopsis carapauulifera, and Diplophysa iuermis. No doubt further 

 researches will increase this list of tropical Acalephs that are drifted 

 far from their southern habitat and slowly perish in the colder waters 

 of the north. 



It is interesting to notice that the Acalephian fauna of Charleston 

 Harbor, South Carolina, in latitude 32°, 20', is very different from 

 that of the Tortugas, and may be said to be subtropical ; for it is 

 intermediate in character between the fauna of the Tortugas and that 

 of the southern coast of New England. For example, the following 1 3 

 Acalephs are established both at Charleston, South Carolina, and 

 on the southern coast of New England : Dactylometra quinquecirra, 

 Cyanea versicolor, Eucheilota duodecimalis, Epenthesis bicophora, 

 Oceania languida, Willia ornata, Gemmaria gemmosa, Pennaria tiarolla, 

 Stomotoca rugosa, Stomotoca apicata, Turritopsis nutricula, Margelis 

 carolinensis, and Nemopsis Bachei ; and the following 1 7 Acalephs are 

 found both at Charleston and the Tortugas : Dactylometra quinque- 

 cirra'? Beroe Clarkii, Bolina vitrea, Margelis carolinensis, Stomotoca 

 rugosa, Gemmaria gemmosa, Turritopsis nutricula, Halitiara formosa, 

 i^tlquorea floridana, Eutima mira, Eutimalphes coorulea, Epenthesis fol- 

 leata, Eucheilota ventricularis, Steenstrupia gracilis, Liriopo scutigera, 



