F.AIIAi\rA 1IEDUS.E. 13 



sixteen well developed, tightly coiled teutacles, and about 112 small mar- 

 ginal cirri. A dark brown eiitoderinal ocellus is found near the base of each 

 cirrus. There are sixteen radial canals, which arise from the gastric por- 

 tion of the manubrium in four radially situated groups of four canals each. 

 The manubrium iuis a wide basal peduncle which fills the nuijor portion of 

 the bell-cavity. Eight promincMit recurved lips. The sixteen gonads are on 

 the proximal parts of the sixteen radi:il canals close to the iminul)rium. En- 

 toderm of manubrium dull yellow or green, and of tentacle-bulbs dull brown- 

 ish yellow. Common ■,\t P.ahamas and Tortugas, Florida, in summer. 



Willia ornata, McCrady. 



Fig. 12, Plate II. 



McCradt, J., 1857; Gymn. Charleston Harbor, p. 47, PI. 9, Figs. 9-11. 

 AoAssiz, A., 1865 ; North Amor. Aeal., p. 171 Figs. 274a-279. 



Brooks, W. K., 1881 ; Studies .Tohns Hopkins University Marine Lab., Vol. II.. p. 144. 

 Willia gemmifera, Fewkes, J. W., 1883 ; Bull. Mus. Comp. ZoOl. at Harvard Coll., Vol. IX., 

 p. 300, Fig. 34, PI. I. 



Bell hemispherical, 5 mm. in diameter, with a small apical projection. 

 There are sixteen marginal tentacles with well developed bulbs, each of which 

 arises at the point of juncture between the radial vessels and the circular 

 canal. Four radial canals arise from tlie manubrium, and each of these gives 

 rise to three side branches, so that sixteen canals reach the circular vessel. 

 Sixteen very slender tubes arise from tlie circular canal and each ends blindly 

 within the gelatinous substance of the bell. Several distinct clusters of 

 uematocysts are usually found on the ex-umbrella surface immediately over 

 each of these tubes, although in some individuals there is but a single cluster 

 over each tube. The manubrium is wide and flask-shaped, and provided with 

 four prominent recurved lips. The gonads are situated at the four radial 

 corners of the manubrium. The entoderm of the manubrium is sage-green- 

 yellow, while the tentacle-bulbs are brownish. In every respect this medusa 

 resembles the Willia ornata of Charleston and Newport harbors. It seems 

 probable that Willia gemmifera is only a southern variety of (liis medusa 

 wbicli produces medusa' asexually tln'ough budding at the points of juncture 

 of (he four radial canals with the manubrium. The only difference of spe- 

 cific value between gemmifera and ornata is that in the former there is but. 

 (jiic cluster of nematocysts over the blindly ending diverticuhe of the circu- 

 lar vessel, whereas in W. ormifa (here may be one or scrcrul such clusters 



