BAHAMA MEDUSJ3. 15 



recurved lips. The entoderm of the manubrium, gonads, and tentacle-bulbs 

 is reddish brown or dull yellow. Found at the Bahamas and Tortugas in 

 summer. Not very common. 



Oceania McCradyi, Brooks. 



Figs. 2S-2Jk, Plate III. 



Epenthesis McCradyi, Brooks, W. K.. 1888; Studies Johns Hopkins Univ. Biol. Lab., Vol. 

 IV., p. 147-163, Pis. 13-15. 



Mater, A. G., 1900; Bull. Mus. Oomp. ZoBl. at Harvard Coll., Vol. XXXVII., p. 50, Figs. 

 56-59, PI. 21. 



Adult Medusa: Bell flat; 12 mm. in diameter. 20-25 slender tentacles, 

 with well developed basal-bulbs. 20-25 simple otocysts, each containing a 

 single otolith, alternating with the tentacles in position. Velum well devel- 

 oped. Manubrium quadrate, urn-shaped, and with four recurved lips. Four 

 straight, slender, radial canals. Four gonads, each at the centre of a radial 

 canal. Elongate, slightly curved, club-shaped hydroid blastostyles are borne 

 on the gonads of the male medusje. These blastostyles give rise to medusae 

 by budding. When set free the medusae are about 0.7 mm. in diameter and 

 have eight tentacles alternating with eight otocysts. The ectoderm of the 

 blastostyle is directly continuous with that of the gonad from which it arises, 

 but its entoderm is not in direct connection with that of the parent medusa. 

 Supporting lamella of the bell pink, entoderm of gonads, manubrium and 

 blastostyles dull green sprinkled with gray pigment granules. Abundant in 

 the Bahamas in summer; not found in winter. Rare at the Tortugas, Florida. 



It is interesting to observe that Hartlaub, 1897; Hydromedusen Helgo- 

 lands, has demonstrated that in Bougainvillia supreciliaris, and Margelopsis 

 Haeckelii, some of the ova develop into planulse within the ectoderm of the 

 parent medusa. 



Epenthesis folleata, McCeady. 



Figs. 16, 16a, Plate III. 



McCrady, J., 1857; Gymn. Charleston Harbor, p. 98. 

 Bbooks, W. K., 1883 ; Studies Johns Hopkins Biol. Lab., Vol. II., p. 138. 

 Mayek, a. G., 1900 ; BuU. Mus. Comp. Zool. at Harvard Coll., Vol. XXXVII., p. 52, Fig. 139, 

 PI. 41. 



Bell flatter than a hemisphere, and about 5 mm. in diameter. Sixteen 

 marginal tentacles, alternating with sixteen otocysts, each containing a 

 single otolith. Four straight radial canals upon which, near to the circular 

 vessel, are the four gonads. Manubrium small and urn-shaped, with four 



