210 Leuckart: Bericht üb. d. Leist. in d. Naturgescliichte 



lonectes n. gen. (Orythia lutea Q. et Gaim.), Mastigias n. gen. 

 (Cephea papua Less.), Himantostoma n. gen. {H. Sueurii n. sp. 

 Chin. Küste), Catostylus n. gen. (Cephea mosaica Q. et G., C. 

 Wilkesii n. sp. Illiware-See), Rhac o pilus n. gen. {Rh. cyanoloba- 

 tus Rio de Jan.), Toxoclxjtus n. gen. (Rhiz. rosea Less., Cephea 

 Dubreuilli Less.), Melitaea Per. et Less., Thysanostoma n. gen. 

 (Melitaea brachyuraLess. = Th. Lessoni Ag.), Evagora Per. et Less. 



Char. gen. n. St omolophus Ag. The arms soldered toge- 

 ther for their whole length, forming a large cylindrical tube and 

 leaving only a small entrance into its interior between its terminal 

 lobes. The upper bunches of the marginal lobes of the arms very 

 long, the lower ones peculiarly formed. 



Char. gen. n. S tylo nectes Ag. Eight connate arms, each 

 ending in a long tricuspidated stylet and bearing a small bunch of 

 marginal fringes at tke base. 



Char. gen. n. Mastigias Ag. Eight armes, arising from a 

 comparatively narrow actinostome, with a double row of interlocked 

 marginal folds near their base and a long simple terminal ap- 

 pendage. 



Char. n. gen. Himantostoma Ag. Eight slender arms, 

 arising from a wide actinostome , ruffled with marginal folds for 

 their whole length, with the exception of their cuspidate termina- 

 tion. Fire slight marginal lobes in each segment, between two of 

 the eight eyes. 



Char. gen. n. Catostylus Ag. The centre of the actinostome 

 a widely-spread horizontal flower. 



Char. gen. n. Rhacopilus Ag. Four large pointed lobes in 

 each segment between two of the eight eyes. Large actinostome, 

 consisting of four pillars , between which are the large openings 

 leading into the four genital pouches and from which hang eight 

 large arms, covered with numerous folds of the marginal lobes. 



Char. gen. n. Tox o clytus Ag. Eight short arms with cy- 

 lindrical base, widening at their extremity into broad, arrow-head 

 like appendages, bordered with numerous folds of the margi- 

 nal lobes. 



Char. gen. n. Thysanostoma Ag. Eight very long papillate 

 arms, with a distinct round lobe, projecting outward from their base. 



Fam. Leptobrachidae Ag. Mit sehr langen schlanken Armen, 

 die in der Nähe ihrer Enden ein kleines Bündel Randfranzen tragen. 

 Vier Genitaltaschen. 



Hieher nur das Gen. Leptobrachia Brdt. mit L. leptopus Brdt. 

 und Rhizostoma loriferum Hempr. et Ehrbg. 



Farn. Cassiopeidae Til. Acht Genitaltaschen, die mit den acht 

 Armen abwechseln. 



