158 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
pared with what we should expect to find in the sub-tropical regions of 
the Atlantic Gulf Stream. We obtained seven genera of Scyphomedusæ, 
twenty of Hydromedusæ, nine of Siphonophoræ, and two Ctenophora. 
With the exception of two Rhizostomæ, all of the genera are repre- 
sented by species found in the Atlantic Ocean. Indeed, the affinity 
between the Meduse of the Fiji Islands and those of the West Indies is 
remarkably close, and in six cases we are unable to distinguish any 
specific differences between the Fijian species and well known Atlantic 
forms, and therefore venture to assert that they are specifically identical. 
The following table illustrates the Atlantic distribution of these Medusæ 
that are found also in the Fiji Islands. 
1 Halitiara formosa, Fewkes. Dry Tortugas Islands, Florida, 
2 Pandea violacea, nov. sp. Dry Tortugas Islands, Florida. 
3 Rhegmatodes floridanus, L. Agassiz. Bahamas, Gulf of Mexico, 
4 Mginella dissonema, Haeckel. Canary Islands; Dry Tortugas 
Islands. 
5 Agalma Pourtalesii, nov. sp. Dry Tortugas Islands, Florida, 
6 | Abyla (Abylopsis) quincunx, Chun. Tropical Atlantic, Dry Tortugas 
Islands, Florida, 
In the following ten genera the Fijian form is represented in the 
Atlantic Ocean by a very closely allied species: Linerges, Nausithoé, 
Tamoya, Cunina, Aglaura, Gonionemus, Mitrocoma, Tiaropsis, Eutima, 
and Sphæronectes. Indeed, the acalephan fauna of the Fiji Islands, 
if one excepts the Rhizostomæ, is more closely related to that of the 
Dry Tortugas Islands, Florida, than is the latter to the fauna of the 
Mediterranean Sea. 
In this connection it is interesting to notice that A. Agassiz has 
shown that the deep sea fauna of the Gulf of Mexico and the Caribbean 
Sea is far more closely allied to that of the Pacific than it is to that of 
the Atlantic, and this is accounted for upon the supposition that before 
the Cretaceous period the Gulf of Mexico and the Caribbean were in freer 
communication with the Pacific than with the Atlantic. Again, in 
1892,? the same author found that in nearly all the groups of deep sea 
gassiz, A., 1892, Bull. Mus. Comp. Zoöl., Vol. XXIII. pp. 74-82. 
