36 



MEDUSAE OF THE WORLD. 



Steenstrupia tetrabrachia. 



Euphysa telrabrachia, BIGELOW, H. B., 1904, Bull. Mus. Comp. Zool. at Harvard College, vol. 39, p. 251, plate I, fig. I. 

 (?) Euphysora bigelowi, MAAS, 1905, Craspedoten Medusen der Siboga Expedition, Monog. 10, p. 7, taf. I, figs. 1-3. 



Bell 4mm. high, 2. 5 mm. wide. Pyriform,with solid apical projection. One long sparsely- 

 ringed tentacle about 4 times as long as the bell is high. 3 other, smaller tentacles, each about 

 one-third as long as the bell-height. These bear each about 3 rings of nematocysts, while the 

 long tentacle bears about 6 such rings. Velum well developed. Manubrium large, spindle- 

 shaped, with mouth projecting beyond the velar opening. Gonads on sides of stomach. 

 Eggs arranged in 8 fairly distinct rows. Bell colorless. Gonads brownish-yellow. Manubrium 

 pinkish. Tentacle-bulbs and rings on tentacles rose-pink. Suvadiva Atoll, Maldive Islands, 

 Indian Ocean; in January. 



This medusa is probably redescribed by Maas as E. bigelowi. 



Steenstrupia bigelowi. 



Euphysora bigelowi, MAAS, 1905, Craspedoten Medusen der Siboga Expedition, Monog. 10, p. 7, taf. i, figs. 1-3; 1906, Revue 



Suisse de Zool., tome 14, p. 84, pi. 2, figs, i, 2. MULLER, 1908, Zeit. fur wissen. Zool., Bd. 89, p. 59. 

 (?)Euphysora tetrabrachia, BIGELOW, 1904, Bull. Mus. Comp. Zool. at Harvard College, vol. 39, p. 251, plate i, fig. I. 



Fir,. 8. Steenstrupia tetrabrachia, after Bigelow, 

 in Bull. Museum Comp. Zool. at Harvard 

 College. 



FIG. 9. Steenstrupia bigelowi, after Maas, in 

 Hydromedusen Siboga Expedition. 



Bell 13 mm. high; more than twice as high as it is wide, and with a well-developed 

 apical projection. Bell-cavity 10 mm. deep. Apical projection 3 mm. high. Side walls thin. 

 4 tentacles at the bases of the 4 radial-canals. One of these tentacles is longer than the bell- 

 height and bears about 30 swollen nematocyst-warts. The 3 other tentacles are each one- 

 third to half as high as the bell and are tapering, without nematocyst-warts, but covered with 

 diffuse nettling cells. Manubrium spindle-shaped, not extending beyond the velar opening. 



