MAYER : MEDUSA FROM THE TORTUGAS, FLORIDA. 49 



Laodicea iilothrix, IIaeckel. 



Laodicea ulothrix, Haeckel, E., 1879, Syst. der Medusen, p. 133, Taf. VIII., 

 Figs. 5-7. 



Specific Characters. — The bell is about 20 mm. in diameter and is about 

 twice as broad as it is high. (Haeckel, 1879, p. 133, says "etwa doppelt so 

 hoch als breit.") This is doubtless a misprint. There are 70-100 long, 

 slender, stiff tentacles, the distal ends of which are coiled in a close helix. 

 The basal bulbs of these tentacles are large and hollow, and there is a well- 

 developed ectodermal ocellus upon the inner (centripetal) side of each bulb. 

 In addition to these ocelli one often sees small spur-like projections upon the 

 outer (centrifugal) sides of the tentacle bulbs. Not all of the tentacles pos- 

 sess these spurs. Sensory clubs and cirri are scattered somewhat irregularly 

 between the tentacles. The sensory clubs are almost as numerous as the 

 tentacles. They are flask-shaped, and their entodermal cores are in direct 

 connection with the entoderm of the circular tube. There are no otoliths. 

 The cirri are usually less numerous than the tentacles. They are coiled in a 

 helix, and their distal ends are covered with large spindle-shaped nematocyst- 

 capsules. The velum is well developed. There are 4 straight, narrow, radial 

 tubes, the proximal halves of which, adjacent to the proboscis, are occupied 

 by the gonads. The proboscis is short, and there are 4 recurved lips. 

 The entoderm of the proboscis, gonads, and tentacle bulbs is brownish- 

 white, or greenish-white in color. This medusa is one of the commonest at 

 the Tortugas, Florida. Haeckel found it at the Canaries, and Brooks describes 

 it from the Bahama Islands. The distribution of the sensory clubs is usually 

 more irregular than is described by Brooks. 



TIAROPSIS, Agassiz, L., 1849. 

 Tiaropsis punctata, nov. sp. 



Figs. 60-63, Plate 83. 



Tiaropsis diademata, Fewkes, J. W., 1882, Bull. Mus. Conip. Zoul., Vol. IX. 

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



Specific Characters. — The bell is bluntly cone-shaped and is 4 mm. in di- 

 ameter. There are 4 well-developed, radially placed tentacles, the distal ends of 

 which are usually coiled in a close helix. In addition to these there are 4 

 rudimentary tentacle bulbs. The 8 marginal sense-organs are situated midway 

 between the 8 tentacles. Each of these organs consists of a pocket-like fold of 

 the velum containing 8-13 otoliths. Immediately above the otocyst there is a 

 well-developed, deeply pigmented eye (see Linko, A., 1899; Travaux Soc. Imp. 



