BAHAMA MEDUS/E. 13 
sixteen well developed, tiglitlj- coiled tentacles, and about 112 small mar- 
ginal cirri. A dark brown eiitodernml ocellus is found near tlie 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 lias a wide basal peduncle which fills the major portion of 
the bell-cavity. Eight prominent recurved lips. The sixteen gonads are on 
the proximal parts of the sixteen radi:il canals close to the manubrium. En- 
toderm of manubrium dull yellow or green, and of tentacle-bulbs dull l)rowu- 
ish 3'^ellow. Common at Bahamas and Tortugas, Florida, in summer. 
Willia ornata, McCrady. 
Fig. 12, Plate II. 
McCrady, J., 1857; Gymn. CharloBton Harbor, p. 47, PI. 9, Figs. 9-11. 
ArtAssiz, A., 18G5 ; North Amer. Acal., p. 171. Figs. 274a-279. 
Brooks, W. K., 1881; Studies Johns 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. 24, 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 the 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 the circular canal and each ends blindly 
within the gelatinous substance of the bell. Several distinct clusters of 
nematocysts are usuall}' 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 this medusa 
which produces medusae asexually through budding at the points of juncture 
of the 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 
one cluster of nematocysts over the blindly ending diverticular of the circu- 
lar vessel, whereas in W. ornata there may be one or several such clusters 
