der niederen Thiere während der Jahre 1861 — 1862. 211 



Hieher Cassiopea Per. et le S. (C. Andromeda Esch.), Cros- 

 s ostoma n. gen. (Cass. frondosa Til.), Stomaster n. gen. (Cass. 

 canariensis Til ), Holig od adodes n. gen. (Medusa lunulata Flem.). 



Crossostoma Ag. The arms form a simple eight-rayed 

 rosette and have numerous lateral dendritic raminifications, as in 

 Cassiopea, but each arm has a separate tuft of fringes at its base 

 Upon the rosette, and the genital pouches have no lateral or ten- 

 tacular pouches. 



Stomaster Ag. The central rosette is double, in conse- 

 quence of the special combination of the separate tufts of the basal 

 branches of the arms. The genital pouches not divided near the 

 margin of the disk. 



Holigo cladodes Ag. The arms are simple and only crenate 

 along the margin, but they have each a double crescent of dendritic 

 ramifications at the base and unite in the ventre to form a dou- 

 ble cross. 



Fam. Cepheidae Ag. Arme kurz, vielfach verästelt, mit Nes- 

 selknöpfen und schlanken Endfäden in verschiedener Anzahl. 



Hieher Cephea Per. et Les. (Medusa octostyla Forsk. und 

 M. ocellata Mod.), P olyrhiza n. gen. (Med. Cephea Forsk., Ceph. 

 fusoa Per. et Le S., C. vesiculosa Hempr. et Ehrbg.), Diplopilus 

 n. gen. (D. Couthauyi n. sp. Wilson's Isld.), Hidr oticus n. gen. 

 {H. rufus n. sp. Sunda-Str.), Cotylorhiza n. gen. (Cephea tuber- 

 cul ata Esch. = Rh. borbonica Esch.), Phyllorhiza n. gen. {Ph. 

 chilensis n. sp.). 



P olyrhiza Ag. Durch die zahlreichen Endfäden von Cephea 

 verschieden. 



Dipl opilu s Ag. The margin of the disk is divided, in each 

 Segment, into eight pointed lobes. The actinostome consists of four 

 broad arms, with numerous fringes and many slender tentacles along 

 their whole margin. Each flat arm is brodly furcate at its extre- 

 mity. (Der Scheitel der Glocke trägt oberhalb des Centralraums — 

 wie das auch wahrscheinlich bei Polyrhiza Cephea der Fall ist — 

 einen sehr ansehnlichen Aufsatz von konischer Form.) 



Hidr oticus Ag. Eight short foliated arms, terminating in 

 eight short , club - shaped tentacles, hanging among the foliaceous 

 appendages. Margin of the disk crenulated. 



Cotylorhiza Ag. Eine cirrenlose Cephea mit gestielten 

 Saugnäpfen. 



P hyll orhiza Ag. Allied to Cotylorhiza, but the eight arms 

 divide into three fringed lobes, like de leaves of clover, instead of 

 being dichotomous, with numerous pendant filaments. 



Fam. Polyclonidae Ag. Mit langen verzweigten Armen und 

 Augen, die zu den Seiten des Genitalradius stehen. 



