14 MUSEUM, BEOOKLYN INSTITUTE OF AETS AND SCIENCES. 



over each diverticulum. The manubrium in W. gemmifera is long and slen- 

 der while that of W. ornata is short and broad; but these differences may 

 be all due to the absence of sperm or ova in W. gemmifera. W. ornata is 

 abundant at the Bahamas and is occasionally found at the Tortugas. W. 

 gemmifera is found at the Tortugas and off the Carolina coast. 



Laodicea ulothrix, IIaeckel. 



Fig. 30, Plate IV. 

 Laodice ulothrix, Habokel, 1879; Das System der Medusen, p. 133, Taf. VIII., Fig. 5-7. 



Bell about 20 mm. in diameter, and a little flatter than a hemisphere. 

 70-100 stiff tentacles about one-third as long as the bell-diameter. These have 

 their distal ends coiled tightly. The tentacle-bulbs are large and hollow, and 

 there is a dark brown ectodermal ocellus upon the inner (sub-umbrella) side 

 of each bulb. Some of the tentacle-bulbs show spur-lilfe projections upon the 

 exumbrella side. Small sensory clubs and coiled cirri are scattered between 

 the tentacles. The cirri are usually somewhat less numerous than the ten- 

 tacles, while the clubs are about equal in number to the tentacles. There 

 are no otoliths. There are four straight, narrow radial tubes. The manu- 

 brium is short and cruciform in cross section, with four recurved lips. 

 The gonads are found on the four radial canals adjacent to the manu- 

 brium. The entoderm of the manubrium, gonads, and tentacle-bulbs is varia- 

 ble in color, being dull pink, brownish or greenish white. This medusa is 

 abundant at the Canary Islands, Tortugas, and Bahamas. 



Tiaropsis punctata, Mayer. 



Fig. 21, Plate III. 



Mayer, A. G., 1900; Bull. Mus. Comp. Zo51. at Harvard Coll., Vol. XXXVII., p. 49, Figs. 

 60-63, PL 23. 



Tiaropsis diademata, Fewkes, J. W., 1882; Bull. Mus. Comp. Zo51. at Harvard Coll. Vol. 

 IX., p. 277, PI. VII., Figs. 13-14. 



Bell about 4 mm. in diameter, bluntly cone-shaped or hemispherical, Four 

 radially situated tentacles with well developed basal-bulbs and coiled distal 

 ends. Four interradial tentacle-bulbs, and eight sense organs, two in each 

 quadrant. Each sense organ consists of a pocket-like fold of the velum, con- 

 taining 8-13 otoliths and immediately above them a large pigmented eye spot. 

 Four straight, narrow radial canals upon the upper portion of which the 

 gonads are situated. The manubrium is wide and flask-like, with four 



