10 MEDUS/E OF THE WORLD. 



Subfamily No. 3, BERENICINJE. 

 The radial-canals give rise to branches which connect with the ring-canal. 



CANNOTA, Haeckel, 1879. 



With four radial-canals, each of which gives rise to two side branches which join the 

 ring-canal. 



CuviERIA, Peron, 1807 = Berenice, Haeckel, 1879. 



With four main radial-canals which give rise to numerous non-dichotomous side branches. 

 Gonads on the terminal ramuli of the canals. 



DICHOTOMIA, Brooks, 1903. 



With four main radial-canals which divide dichotomously two or more times. The 

 gonads extend outward from the stomach over the canals. 



DIPLEUROSOMA, Axel Boeck, i$66 = Tetracannota, Mayer, 1900. 



With three or more main radial-canals which give rise to non-dichotomous side branches. 

 Gonads on the canals adjacent to the stomach. Hydroid: Cuspidella (?). 



ToxoRCHiS = Toxorchis + ClaJocanna, Haeckel, 1879. 



Four or more main radial-canals which branch dichotomously one or more times. Gonads 

 on the outer branches of the canals near the ring-canal. 



NETOCERTOIDES, Mayer, 1900. 



Eight main radial-canals which branch dichotomously. Gonads extend outward from 

 the sides of the stomach along the radial-canals. 



Family No. 2, EUCOPID^. 



Leptomedusaewith lithocysts, and with less than eight radial-canals upon which the gonads 

 are developed. 



Subfamily No. i, OBELIN^E. 

 With eight adradial lithocysts. Four radial-canals. Stomach without a peduncle. 



EUCOPELLA, von Lendenfeld, 1883. 



Degenerate medusae. No tentacles. No manubrium. Branched radial-canals. Hydroid: 



Eucopella. 



AGASTRA, Hartlaub, 1897. 



Degenerate medusae. No manubrium. Simple, unbranched radial-canals. Hydroid: 

 Campanularia ( ?). 



EUCOPE, Gegenbaur, 1856. 



Basal bulbs of the tentacles are simple and hollow, and do not project inward into the 

 gelatinous substance of bell. Lithocysts on bell-margin. Hydroid: Campanulana. 



OBELIA, Peron and Lesueur, 1809. 



Entodermal cores of tentacles project inward into the gelatinous substance of the bell. 

 Otocysts on bases of tentacles. Hydroid : Obelia. 



TIAROPSIS, L. Agassiz, 1849. 



An ocellus with entodermal pigment above each lithocyst. Tentacle-bulbs simple and 

 hollow. 



Subfamily No. 2, PHIALIN^. 



With more or less than eight lithocysts. Four to five radial-canals. Stomach without a 

 peduncle. 



CLYTIA, Lamouroux, \%i2 = Ef>enthesis, McCrady, 1857. 



Sixteen tentacles alternating with sixteen lithocysts. Four radial-canals. No cirri. 

 Hydroid: Clytia. 



