MAYER : MEDUSAE FROM THE TORTUGAS, FLORIDA. 57 



are 4 interradial, rudimentary tentacle bulbs which are flanked by lateral cirri. 

 There are 8 otocysts, 2 in each quadrant. Each otocyst contains a single 

 spherical otolith. The velum is well developed. There is a narrow circular 

 vessel, and 4 straight simple radial canals. The proboscis is flask-shaped, and 

 there is no peduncle. There are 4 simple cruciform lips. Medusa buds in 

 various stages of development are found upon the 4 gonads, which are situated 

 at the middle points of the 4 radial canals. These medusa buds first develop 2 

 diametrically opposed tentacles (Figure 135), but when about to be set free 

 they have 4 equally developed tentacles as in the adult. They have, however, 

 no trace of gonads, and the interradial tentacle bulbs are not provided with 

 lateral cirri. Usually from 2-5 medusa buds in several stages are found upon 

 each gonad. The entoderm of the proboscis gonads and tentacle bulbs is of a 

 milky-green color. 



This medusa was common at the Tortugas, Florida, in June, 1899. 



This is the first and only Leptomedusa which has been observed to give rise 

 to free medusa buds. 



EUTIMA, McCradt, 1857. 



Eutima mira, McCradt. 



Eutima mira, McCrady, J., 1857, Gymn. Charleston Harbor, p. 88, PI. XI. Figs. 8, 9. 



This medusa is common throughout the summer at the Tortugas, Florida. 

 It is also abundant at Charleston, South Carolina, and at Beaufort, North Caro- 

 lina. Damaged specimens are occasionally drifted into Newport Harbor, 

 Rhode Island, by the southerly winds, late in the summer. 



EUTIMALPHES, Haeckel, 1879. 

 Eutimalphes coerulea. 



Figs. 23, 23*, Plate 11. 



Eirene coerulea, Agassiz, L., 1862, Cont. Nat. Hist. U. S., Vol. IV., p. 362. 

 Irene coerulea, Haeckel, E., 1879, Syst. der Medusen, p. 203. 



Specific Characters. — The bell is 10 mm. in diameter and a little broader 

 than it is high. The gelatinous substance at the apex of the bell is quite thick, 

 but becomes progressively thinner as one approaches the margin. There are 

 about 32 short, slender, marginal tentacles, each one of which is furnished 

 with small lateral cirri. In addition to the well-developed tentacles there are 

 about 96 rudimentary tentacular swellings upon the bell margin. There are 

 usually about three of these swellings between each successive pair of tenta- 

 cles. (Figure 22*.) There are 8 otocysts, 2 in each quadrant, and each one 

 of them contains 3-5 spherical otoliths. There are 4 radial tubes. The 



