ACALEPH^. 



189 



i'amilies Oceanjd^. Chylaqueous canals simple : ovaries 



convoluted, and lining the peduncu- 

 lated stomach. Genera Oceanea, 

 Saphenia, Turris, Cytaeis. 

 WiLLsiiDX. Chylaqueous canals branched. Genus 



Willsia*, Berenix, Orythia. 

 Sub-order Steganophthalmata. (Clothed-eyed Medus£e.) 

 Cysticles protected by complicated coverings: Chylaqueous canals 

 canals branched and anastomotic. No gemmation. 

 Families Rhizostomatjtdx. Mouths numerous on the branches and 



borders of a ramified proboscis. Chy- 

 laqueous canals without outlets. Ge- 

 nera Rhizostoma, Cephea, Cassio- 

 p<Ba. 

 MoNOSTOMATmx. Mouth single : Chylaqueous canals, (in 

 some) with distinct outlets. Genera 

 Phacellophora, CyancEa, Pelagic, 

 Chrysaora, Aurelia. 



Order CILIOGRADA. 

 Body spheroidal, oblong, or lobated, rarely lamelliform. Locomo- 

 tion by longitudinal bands of cilia. Sexes, in some, combined. 



Families Beroibm. 



Mnemeidx. 



Calhaniridm. 

 Cestidje. 



Genera Beroe, Lesueuria, Medea, Cy- 



dippe, Pleurobrachia. 

 Genera Mnemia, Eucharis, Janira, 



Alcinoe, Bolena. 

 Genera Callianira. 

 Genera Ocyroe, Cesium. 



Order PHYSOGRADA. 



Body, floated by air-cells. Locomotion by parts exposed to and 

 acted upon by the winds. Nutrition by numerous suctorial tubes. 



Genera Diphyes, Erscea. 



Genera Physophora, Stephanomia. 



Genera Physalia. 



Genera Velella, Rataria, Porpita. 



Families Diphyibje. 



PnYSOPHORIBtE. 



Physalidm. 

 Velellidx. 



* cxi.vn. p. 17. 



