MAYER : MEDUSA FROM THE TORTUGAS, FLORIDA. 51 



Oceania globosa, nov. sp. 



rigs 19, 19", Plate 9. 



Specific Characters. — The bell is globular iu form, 14 mm. in diameter, 

 The cavity of the bell is shallow so that the gelatinous substance is veiy thick. 

 There are 32 large tentacles and 32 rudimentary ones. There are 64 otocysts 

 alternating with the tentacles. Each otocyst contains 3-5 spherical otoliths 

 (Figure 19*). There are 4 straight, nari'ow, radial canals. The 4 gonads are 

 situated upon the distal portions of the canals. The proboscis is very short 

 and there are 4 prominent lips. The color of the entoderm of the proboscis 

 and tentacle bulbs is light drab. 



Single specimen found at Tortugas, June 16, 1897. 



Oceania gelatinosa, nov. sp. 



Figs. 20, 30% Plate 10. 



Specific Characters. — The bell is 7 mm. high and 3.3 mm. in diameter. 

 The gelatinous sulistance of the upper portion of the bell is very thick. There 

 are 16 welKleveloped tentacles and 16 rudimentary ones that may develop 

 later. There are 32 otocysts alternating with the tentacles. Each of these 

 otocysts contains 3-5 spherical otoliths (Figure 20). The velum is promi- 

 nent. There are 4 radial canals, in the upper or proximal portion of which the 

 gonads ai-e developed. The proboscis is long and slender and there are 4 

 prominent lips. The color of the entoderm of the proboscis and tentacle bulbs 

 is light drab, or opaque white. 



A specimen was found at the Tortugas, Florida, on June 14, 1897, and 

 several others during the summer of 1899. 



'a 



Oceania discoida, nov. sp. 



Figs. 53-55, Plate 30. 



Specific Characters. — The bell is qnite flat, with conically sloping sides, and 

 is 4 mm. in diameter. There are 16 short marginal tentacles with large basal 

 bulbs. There are usually 3 otocysts between each successive pair of tentacles 

 (see Figure 55). The velum is well developed. There are 4 straight radial 

 tubes, upon the greater portion of the length of which the gonads are situated. 

 In the case of the female the eggs are very large and prominent. The probos- 

 cis is urn-shaped and there are 4 recurved lips. The proboscis, gonads, and 

 tentacle bulbs are yellow, or yellow-green. The entodermal supporting 

 lamella of the bell is often of a delicate shade of green. The medusa is easily 

 distinguished from the other species of Oceania at the Tortugas by the circum- 

 stance that it is very small in size, the bell is conical in shape, and the gonads 

 are large and prominent. It is quite common throughout the summer. 



