BAHAMA MEDUSJ2. 19 



GENERA AND SPECIES. 

 Gonionemus. 



Gonionemus, Agassiz, A., 1863. 

 Gonynema, Haeckel, 1879. 

 Gonionema Peekins, 1903. 



Generic characters : With an adhesive disk near the distal extremity of 

 each and all of the tentacles. Tentacles all similar each to each, and pro- 

 jecting in a zone from the sides of the bell, above the margin, their entoderm- 

 al cores traversing the gelatinous substance of the bell. Four gonads, rib- 

 bon-like and deflected alternately to one side and the other of the radial 

 canals. No blindly-ending centripetal canals. Numerous otocysts upon the 

 bell-margin. 

 Species : 



G. vertens, Gulf of Georgia, State of Washington ; Alaska. 



A. Agassiz, 1865; North Amer. Aoal., p. 138; Murbach and Shkarek, Proc. 



Zobl. Soo., London, 1903, Vol. II., p. 183. 

 G. Murbachii, Wood's Holl, Massachusetts. 



Mtjbbach, 1895 ; Journ. Morphol., XI., 3. 



Pbhkins, 1903 ; Proo. Acad. Nat. Sci., Philadelphia, 1902, p. 750-790, 5 Plates. 

 G. suvaensis, Suva Harbor, Piji Islands. 



Agassiz and Mateb, 1899 ; Bull Mus. Com. Zo51., XXXII., 9. 

 G. Agassizii, Unalaska, Aleutian Islands. 



Mukbach, 1903 ; Annal. Mag. Nat. Hist., Ser. 7, IX., p. 78. 



Mtjrbaoh and Shbakeb, 1903; Proc. Zool. Soc, London, p. 185, Pis. XXL, 



XXII. 

 G. depressum, Yokohama, Japan. 



Goto, S., 1903; Mark Anniversary Volume, p. 12, Pis. II., ]II. 



Cubaia. 



Cubaia, Mayeb, 1894. 

 Gonionemoides, Mayeb, 1900. 



Generic characters: Tentacles are of two distinct kinds. Those of one set 

 are provided with adhesive pads, as in Gonionemus, and project from a zone 

 slightly above the bell-margin, their entodermal axes traversing the gelati- 

 nous substance of the bell. The other tentacles arise from the bell-margin, 

 and are provided with terminal clusters of nematocysts but not with adhe- 

 sive pads. The gonads are papilliform. There are no centripetal canals. 

 There are numerous otocysts upon the bell-margin projecting freely into the 

 water. 

 Species : 



O. aphrodite, West Indies, Bahamas, Tortugas. 



Mayeb, 1894; Bull. Mus. Comp. Zool. XXV., p. 337. 



Ibid (Gonionemus aphrodite) XXXVII., p. 62. 

 O. geophila, (Gonionemoides geophila) ; Bahamas, Florida. 



Mayer, 1900 ; Bull. Mus. Comp. Zool. XXXVII., p. 62. Immature medusa. 



"IreniopsiBprimordialis,"Bull. Mus, Comp. Zool., 1894; XXV., p. 238. 



