LEPTOMEDUS.E. 11 



PHIALIDIUM, Leuckart, i%$() = 0<:eania, Agassiz, 1862, 1865. 



Sixteen or more tentacles. More than sixteen lithocysts. Four radial-canals. No rudi- 

 mentary tentacles. No cirri. Hydroid: Campanulina. 



PHIALUCIUM, Maas, 1905. 



Similar to Phialidium, but with permanently rudimentary tentacle-bulbs. Hydroid un- 

 known. 



BLACKFORDIA, Mayer. 



Numerous tentacles and lithocysts. Entodermal cores of some or all of the tentacles 

 project inward into the gelatinous substance. Four radial-canals. No cirri. No 

 permanently rudimentary tentacles. 



PSEUDOCLYTIA, Mayer, 1900. 



Five radial-canals, five lips, five gonads. Numerous tentacles and lithocysts. No cirri. 



GASTROBLASTA, Keller, \?>?>^=Multioralis, Mayer, 1900. 



Two or more manubria. No cirri. The medusa propagates by fission. 



EUCHEILOTA, McCrady, 1857. 



Four or more closed vesicular lithocysts. Four radial-canals. Marginal or lateral cirri. 

 Hydroid: Campanulina ( ?). 



MnROCOMA = Phialis + Mitrocoma + Mitrocomiurn + Mitrocomella, Haeckel, 1879. 



Similar to Eucheilota, but the lithocysts are contained in open folds of the velum. No 

 entodermal ocelli such as are found in Tiaropsis. 



STAUROPHORA, Brandt, lS^ = Staurostoma + Staurof>hora, Haeckel, 1879. 



Mouth an open, cruciform, gutter-like slit extending down the four radial-canals. 



Subfamily No. 3, EUTIMINJE. 



With eight adradial lithocysts. Stomach mounted upon a gelatinous peduncle. Four 

 radial-canals. 



SAPHENIA, Eschscholtz, 1829. 



Two tentacles. Numerous cirri. 



EUTIMA, McCrady, 1 857 = Eutima + Eutimeta + Octorchis + Octorchandra 



-\-Eutnnalphcs, Haeckel, 1879. 



Four or more tentacles. Numerous cirri or marginal warts. Four or eight gonads upon 

 the four radial-canals. Hydroid: Campanopsis (Claus, Brooks). 



JLwTIMlUM = Eutimium + Octorchi(lium, Haeckel, 1879. 



Similar to Eutima, but without cirri. Hydroid: Campanulina ( ?) 



Subfamily No. 4, EIRENINvE. 



With more than eight lithocysts. Stomach mounted upon a gelatinous peduncle. Four 

 or six radial-canals. 



PHORTIS, McCrady, 1857. 



Four or more tentacles. No cirri. Four radial-canals. Hydroid: P/iortis Brooks. 



IRENOPSIS, Goette, 1886, non Ireniopsis, Mayer, 1894. 



Six or more tentacles. Six radial-canals. Six lips. Six gonads. 



EIRENE, Eschscholtz, i%2g= Irene +Irenittm, Haeckel, 1879. 



Four or more tentacles. Numerous marginal warts or cirri. Four or eight gonads 

 developed upon limited parts only of the four radial-canals. Hydroid: Campan- 

 ulina ( ?) 



TIMA, Eschscholtz, 1829. 



Similar to Eirene, but with gonads upon the entire lengths of the four radial-canals. 

 Hydroid: Campanulina ( ?) 



