16 MUSEUM. P.HOOKLYM IXSTUrUTK OF AKTS AND SCIENCES. 



sli.shtly rccni-v('(l lips. Entoderm of manubrium, gonads and tentaflo-bulbs 

 usually green, ('mnmon off Bahamas, Florida, and Carolina coasts in winter 

 and spring, {{are after mid summer. 



Obelia sp. 



Figs. 10-20. riiilr III. 



Agassiz, a.. 1888 ; Bull. Mus. Comp. Zool. at Harvard Coll., Vol. IX., p. 14i). 

 Mater, A. G.. 1900 ; Ibid., Vol. XXXVII., p. 52. 



Bell Hat and disk-like. About 3 mm. in diameter. About 100 stiff ten- 

 tacles, each one-ciuarter as long as the bell diameter. Eight otocysts at the 

 bases of eight of the tentacles, two in each quadrant. Four gonads large and 

 distended. \>hen mature they lie near the middle of the radial canals. En 

 toderm of manubrium and tentacle-bulbs milky in color. Bell transparent. 

 Common at the Bahamas, rare at Tortugas, Florida. Hydroid unknown. 



Eucheilota paradoxica, Mayer. 



Figs. 17 -IS, Plate III; Fig. 65, Plate VII. 

 Mater A. O.. 1900 ; Bull. Mus. Comp. Zool. at Harvard Coll., Vol. XXXVII.. p .56, Fig. 134- 

 136, PI. 40. 



Mature Mcdiifni: Bell about 4 mm. in diameter, and more than a hemis- 

 phere, with a slight apical projection. Four large radially situated tentacles 

 each flanked by two short coiled cirri. The basal-bulbs of these tentacles are 

 laro-e and hollow. There are also four interradial rudimentary tentacle-bulbs, 

 each flanked by a pair of cirri. Eight otocysts, two in each (|uadrant, each oto- 

 cyst bearing a single otolith. Four straight slender radial canals in the 

 middle of each of which the gonads are situated. Manubrium small and 

 flask-shaped, with four simple lips. Color of entoderm of manubrium, gonads 

 and tentacle-bulbs dull milky green. In the young medusa, the gonads are 

 adjacent to the manubrium, but they finally migrate down the radial canals 

 so as to come to lie upon the middle of each canal. Medusa buds arise from 

 these gonads. When set free each medusa has four well developed radially 

 situated tentacles as in the adult, but the interradial tentacle-bulbs lack 

 lateral cirri. A number of the budding medusae were killed in Flemming's 

 fluid and sectioned, and it appears that both entoderm and ectoderm of the 

 gonad of the parent take part in the formation of the bud which is thus 

 formed, as are the medusa buds of the Sarsiad;e or those of the hydroids ( Fig. 



