BAHAMA MEDUSAE. 17 
65, Plate VII). It is interesting to see that even before it is set free the 
gonads of the budding medusa are well developed (b., Fig. 65). 
Phortis pyramidalis. 
Fig. 25, Plate III. 
Eutima pyramidalis, Agassiz, L., 1862; Cont. Nat. Hist. U. S., Vol. IV., p. 363. 
Agassiz, a., 18G5 ; North Amer. Acal, p. 118. 
Haeckel, E., 1879; Das Sj'st. der Medusen, p. 191. 
Phortis pyramidalis, Mayer, A. G., 1900; Bull. Mus. Comp. Zool. at Harvard Coll., Vol. 
XXXVII., p. o9, Figs. 21, 21a, Plate 10. 
Mature Medusa: Bell about 35 mm. in diameter. Slightly flatter than a 
hemisphere. The gelatinous substance is thick and rigid, and the manu- 
brium is situated at the extremity of a wide, conical peduncle, which fills 
the greater portion of the bell-cavity. About 100 short tentacles alternat- 
ing with 100 otocj'sts each containing a single otolith. No lateral cirri. 
Four narrow straight radial canals. Four gonads upon the radial canals 
near the circular vessel. Manubrium small and urn-shaped with four 
prominent recurved lips. Manubrium, gonads, and tentacle-bulbs delicate 
turquoise, other parts transparent. Common at Bahamas and Tortugas. 
Brilliantly phosphorescent at night, giving an intense blue-green light. 
Zygodactyla cyanea, L. agassiz. 
Figs. 26, 21, Plate III. 
Agassiz, L., 1862; Cont. Nat. Hist. U. S.. Vol. IV., p. 361. 
Agassiz, A., 1865; North Amer. Acal , p. 107. Fig. 159. 
^fATER. A. G., 1900; Bull. Mus. Comp. Zool. at Harvard Coll., Vol. XXXVII, p. CO, Figs. 28. 
23a, PI. 11, Figs. 33, 34, PI. 1.5. 
Bell about 45 mm. in diameter, flatter than a hemisphere. Gelatinous 
substance of the central part of the bell thick with a well developed pedun- 
cle, which projects downward into the cavity of the stomach. Peripheral 
zone of the bell thin and flexible. About 100 long tentacles and 100 simple 
straight radial canals upon which the linear gonads are situated. Each 
tentacle-bulb hollow and conical, and provided with a conical excretion 
papilla which projects outward from the exumbrella side of the bell. In 
addition to the well developed tentacles there are about 300 small rudimen- 
tary tentacle-bulbs, each provided with an excretion papilla, and also about 
300 otocysts each containing two otoliths. The manubrium is wide and 
shallow and does not project beyond the velar opening. There are as many 
