NARCOMEDUS.E. 15 



Order No. 4. NARCOMEDUS^ Haeckel, 1879. 



Veiled medusae with bell-margin cleft into intertentacular lappets. With free lithocyst- 

 clubs, containing concretions of entodermal origin. These medusx develop from actmula 

 larvae either directly or by budding. The bell grows outward from the sides ot the body of the 

 actinula, or the medusa-bud, leaving the tentacles stranded in the partially closed-over clefts 

 between the lappets of the bell. The Narcomedusae are thus medusiform, actinula-like 

 animals, the bell of which is not homologous with that of the Anthomedusae or Leptomedusae. 



Family No. i, SOLMARIDjC. 



Narcomedusae in which the outer margin of the stomach is plain, entire, and without 

 peripheral stomach-pouches. Saccules may, however, arise from the subumbrella floor of 

 the stomach. 



o/)'fo//>a (young) + Sohnaris, Haeckel, 1879. 

 Without subumbrella saccules. Gonad is a simple annulus in ectoderm of subumbrella 



floor of stomach. 

 PEGAJXTBA=Pegasia+Polyxenia+Pegantha+SoImoneta (in part), Haeckel, 1879. 



With out-pocketings on the subumbrella floor of the stomach. The gonads are developed 

 in these subumbrella saccules. 



Family No. 2, jEGINID^E, sens. ampl. 



Narcomedusae in which the central stomach gives rise to simple or cleft marginal out- 

 pocketings in the radii of the tentacles. 



CUNANTHA, Haeckel, 1879. 



Four tentacles. Four peronial strands in the tentacular radii. Four simple, uncleft, 

 peripheral stomach-pouches in the radii of the tentacles. This "genus" is prob- 

 ably only a young stage of JEgina. 

 JEciNA, Eschscholtz, i$2g = Cunarcha + gina + SolmunJus, Haeckel, 1879. 



Four tentacles. Four peronial strands. Four cleft ( = eight peripheral) stomach-pouches, 

 outer margins of which may be still further divided. 



SoLMUNDELl.A=dlgi>iella + SolmunJella, Haeckel, 1879. 



Two tentacles. Four peronial strands. Four cleft ( = eight peripheral) stomach-pouches. 

 An apical (exumbrella) sense-organ is present in larva, but does not persist in adult. 

 Derived from jEgina by the disappearance of half ot its tentacles. 



HYDROCTENA, DawydofF, 1903. 



Two tentacles. No peronial strands. Two simple, uncleft stomach-pouches in the 

 tentacular radii. There is an apical (exumbrella) sense-organ consisting in a 

 ciliated pit containing two lithocyst-clubs. A median axial canal extends upward 

 from the stomach to the bottom of the sensory pit. 



CUNOCTANTHA, Haeckel, 1879. 



Eight tentacles. Eight peronial strands. Eight simple, uncleft stomach-pouches in the 

 tentacular radii. 



unoctona + ^Eginura, Haeckel, 1879. 



Eight tentacles. Eight peronial strands. Eight cleft ( = sixteen peripheral) stomach- 

 pouches. The outer margins of these pouches may be still further divided so as to 

 give thirty-two marginal pouches. 



S, Brandt, 1835. 



Four tentacles. Eight peronial strands. Eight cleft ( = sixteen peripheral) stomach- 

 pouches. Derived from jEginura by the disappearance of half of its tentacles. 



CUNINA, Eschscholtz, 1829. 



Nine or more tentacles, and an equal number of peronial strands. Peripheral stomach- 

 pouches simple, uncleft and equal in number to the tentacles, in the radii of which 

 they are developed. With otoporpae above the sense-clubs. 



