ACALEPH^. 



1S9 



Families Oceanidje. Chylaqueous canals simple : ovaries 



convoluted, and lining the peduncu- 

 lated stomach. Genera Oceanea, 

 Saphenia, Turris, Cytaeis. 

 WiLLsiiBM. Chylaqueous canals branched. Genus 



Willsia *, Berenix, Orythia. 

 Sub-order Steganophthalmata. (Clothed-eyed Medusas.) 

 Cy slides protected by complicated coverings: Chylaqueous catials 

 canals branched and anastomotic. No gemmation. 

 Families Bhizostomatid.^. Mouths numerous on the branches and 



borders of a ramified proboscis. Chy- 

 laqueous canals without outlets. Ge- 

 nera Bhizosfoma, Cephea, Cassio- 

 pcea. 

 3IoNOSTOMATiDm. Mouth single : Chylaqueous canals, (in 

 some) with distinct outlets. Genera 

 Phacellophora, Cyancea, Pelagia, 

 Chrysaoro, Aurelia. 



Order CILIOGRADA. 

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

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

 Families Behoibje. Genera Beroe, Lesueuria, Medea, Cy- 



dippe, Pleurobrachia. 

 Genera Mnemia, Eucharis, Janira, 



Alcinoe, Bolena. 

 Genera Callianira. 

 Genera Ocyroe, Cestum. 



Mnemeidje. 



Callianiridm. 

 Cestid^, 



Order PHYSOGRADA. 



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

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

 Families Diphyidm. Genera Diphyes, Ersma. 



pHYsopHORii)^. Genera Physophora, Stephanomia. 



Physalid.e. Genera Physalia. 



Velellidje. Genera Velella, Bataria, Porpita, 



* CXL VII. p. 1 7. 



