der niederen Thiere während der Jahre 1861—1862. 213 



of slender tentacles. Sixten bunches of tentacles arranged in a single 

 row in each lobe. The genital pouches are very wide and conceale 

 the whole actinostome, with the exception of its central peduncle, 

 which hangs below them. Lobes of the margin of the disk angular, 

 so that the margin itself appears straight and is only cleft at 

 intervals. 



Farn. Pelagidae Gegenb. Scheibe mit zahlreichen kurzen Rand- 

 fäden mid vier schlanken, an der Basis verwachsenen Armen. Ra- 

 diärkanäle weit und ziemlich gleichförmig. Rand mit mehr oder 

 minder zahlreichen Lappen. 



Hieher Pelagia Per. et Le S. mit 8 Arten (P. tuberculosa 

 Couth. Mscpt. = P. panopyra Brd,), Placois n. gen. (Pelagia dis- 

 coidea Esch.), Chrysaora Per. et Le S., Desmonemn n. gen. (Chrys. 

 Gaudichaudi Less.) , Lobocrocis n. gen. (Chr. Blossevillii Less.), 

 Dactylometra n. gen. (Chr. lactea Esch. und Pelagia quinque- 

 cirra Desor), Polybostrycha Brdt., Melanaster n, gen. (M. Mer- 

 tensi Ag. = Chr. melanaster Brdt.), Zygonema n. gen. {Pelaqia 

 volutata Couth. Mscpt., Rio), Nausithoe KöU. (ein Genus, dessen Ar- 

 ten Verf. übrigens als junge Pelagien mit beginnender Geschlechts- 

 reife betrachten möchte). 



Placois Ag. The margin of the disk being divided into 32 

 lobes (not 16 as in Pelagia), between two and two of which alter- 

 nate eight eyes and eight tentacles. 



Desmonema Ag. Marginal lobes very large and triangulär, 

 twelve in number and terminating in twelve fasciculated tentacles. 

 Twelve small lobes (eyes 8) alternating with the large lobes. 



Lobocrocis Ag. Margin double lobed; the outer row 

 containing twice as many pointed lobes as the inner one, the lobes 

 of which are broadly rounded. Tentacles between alternate margi- 

 nal lobes. 



Dactylometra Ag. The margin of the disk is divided in 

 48 lobes, sixteen of which are ocular lobes and thirty two tentacu- 

 lar lobes, two and two of which are separated by a short tentacle, 

 while there is one large tentacle between the two paires on another 

 outside of each pair, so that the total number of tentacles, large and 

 small, is 40. 



Melanaster Ag. Forty eight lobes, as in Dactylometra, from 

 which it differs in having only three tentakles to each tentacu- 

 lar lobe. 



Zygonema Ag. All the Segments between the eyes show 

 four larger lobes, subdivided by shallow indentations, from which 

 arise four tentacles. 



Subord. Haplosiomea e Ag. Mit weiten Radialtaschen ohne 



