30 MUSEUM, BROOKLYN INSTITUTE OF ARTS AND SCIENCES. 

 Nausithoe-punctata, Koluker. 



K6li,iceb a., 1853; Zeit. far Wissen. Zool.. Bd. IV, p 333. 



Nausithog albida, Cards. V., 1857 ; fcones Zootom. Taf. II, Fig. 17, 22, 23, var. pacifica Aqas- 

 siz, A. and Mater, A. G., 1902 ; Mem. Mus. Oomp. ZooL, Vol. XXVI, p. 155, PI. 7, Fig. 32. 



This medusa is abundant in the Bahamas, Tortugas and Mediterranean 

 during the summer months, and a closely allied variety is found in the Trop- 

 ical Pacific. 



Linerges mercurius, Haeckel. 



Hakckel, E., 1880 ; Syst. der Medusen, p. 495, Taf. XXIX, Fig. 4-6. 



The young ephyrae of this medusa appear in vast numbers in the Bahamas 

 in March and grow rapidly to maturity, disappearing before the first of June. 

 A closely allied species, Linerges aquila, is common in November and Decem- 

 ber in many of the lagoons of Atolls in the Tropical Pacific. 



Aurelia habanensis, Mater. 



Mayer, A. G., 1900, Bull. Mus. Comp. Zool at Harvard Coll., Vol. XXXVII, p. 69, Figs. 73, 

 74, PI. 24 ; Fig. 86, PI. 26. 



The ephyrae of this species appear in considerable numbers in June and 

 July, and mature individuals are abundant in August. Mature specimens are 

 also found in Havana harbor in February. 



Cassiopea frondosa, Lamarck. 



Lamarck, J. de., 1817 ; Hist. anim. sans vert., Tom. II, p. 512. 



Medusa frondosa, Palla-s, P. S., 1774 ; Spicilegia Zool. Faso. X, p. 29, 30 ; PI. 2, Fig. 1-3. 

 Cassiopea frondosa, TrLESius, W. G. , 1834 ; Beitrage zur Nat. der Medusen, Acad. Cms 

 Leop. Nova Acta, Tom. XV, p. 263, 278 ; Tab. LXXII, Figs. 1-5. 



Polyclonia frondosa, Aqassiz, L.. I860; Cont. Nat. Hist. U. S., Vol. Ill, Pis. 13, 13a. 



This medusa is locally abundant in spring and summer. It prefers 

 muddy bottoms where the water is not very pure and often remains motion- 

 less for long periods of time with its disk pressed against the ground, its 

 oral side and mouth arms being uppermost. 



It is abundant in June and July in the moat of Fort Jefferson Dry Tor- 

 tugas, Florida. 



Siphonophorae. 



The Siphonophorae of the Bahamas are species common also to the 

 Tropical Atlantic. They are more abundant at the surface in winter than 

 in summer, when they probably sink to a considerable depth. 



Ctenophorae. 



Bolina vitria is abundant over the shallow banks in summer, while 

 Beroe Clarkii is found commonly in the spring. 



