Chap. II. CLASSIFICATIONS OF ACALEPHS. 141 



2(1 Family. Medusae. 



1st Group. Medusa without proboscis. 



1st Tribe. Eudoras: Discus, Eudora, Eulimenes, Phorcynia, Pileola, Epomis, Ephyra. 

 2d Tribe. Carybdere : Carybdea, Obelia. 



3d Tribe. Marsupials : Marsupialis, Bursarius, Mitra, Eurj'bia, Cytieis, Canipanella, Seyphis. 

 4th Tribe. NucleiferM : Turris, Circe, Conis, Tiara, Tholus, Pandea, Bougainvillia, Pro- 



boscidactyla, Melicertum, Aglaura, Laodicea, Microstoma. 

 5th Tribe. Berenicidie : Berenix, Staurophora. 

 2d Group. Oceanides, or genuine Medusje witli a round mouth but no proboscis. 

 1st Tribe. Thalassanthas : Pegasia, Faveolia, Cunina, -iEgina, jiEginopsis. 

 2d Tribe. jEquoridas : .ZEquorea, Polyxenia. 



3d Tribe. Oceanidaj : Stomobrachiota, Mesonema, Oceania, Patera. 

 3d Group. Agaricine Iledusce, or MedustE with proboscis : Melicerta, Saphenia, Dianea, Orythia, 

 Geryonia, Liriope, Xanthea, Sarsia, Tima, Tbaumantias, Linuche, Usous, Lym- 

 norea, Favonia. 

 4th Group. Rhizostomece, or Medusas with a central peduncle. 

 1st Tribe. Medusidaj, or Meduste monostomeK. 



1st Section. Without tentacles around the disc: Biblis, Melitea, Evagora, Salamis, Pha- 



cellophora. 

 2d Section. With tentacles around the disc : Callirhoe, Sthenonia, Aurelia, Claustra, 

 Cyanea, Cyaneopsis, Pelagia, Chrysaora. 

 2d Tribe. Rbizostomida;, or Medusa; Polystomea- : Ocyroe, Cassiopea, Cephea, Rhi- 

 zostonia. 

 3d Family. Diphyid.e. 



1st Tribe. PoIygastricaB : Diphyes, Heterodiphyes ; Calpe, Abyla. 



2d Tribe. Monogastrica; : Microdiphyes, Cymba, Enneagonum, Cuboides, Cucubalus, Cu- 

 cullus, Eudoxia, Amphiroa, Ersa>a, Aglaisma. 

 4th Family. Polytom.e, or PlethosomyE. 



1st Tribe. Plethosoma; : Plethosoma, Polytomus, Hippopodius, Elephantopes, Racemis. 

 2d Tribe. Stephanoraia; : Stephanomia, Sareoconus, Strobila. 

 5th Family. Physophor^e. 



1st Tribe. Rhizophysa; : Rhizophysa, Brachysoma. 

 2d Tribe. Discolaba? : Discolabe, Diphysa. 

 3d Tribe. Angela; : Angela. 

 4th Tribe. Athorybiai : Athorybia, Anthophysa. 

 5 th Tribe. Pliy sop horse : Physophora. 

 Gth Tribe. A gal ma; : Agalma. 

 7th Tribe. Apolemis : Apoleniia, Apolemiopsis. 

 Gth Family. Physali.e : Physalia. 

 7th Family. Velell^e : Velella, Rataria. 

 8th Family. Porpit.e : Porpita, Ratis, Acies. 



A sketch of this classification was already published in 1835 (Proceed. Zool. Soc. London, 1835, Part 

 III. p. 2), and a special paper upon the Beroids, in Ann. Sc. Nat. 2de ser. 1837, vol. 5. The above 

 diagram gives the classification of Lesson, as it appears in his last work, in the Suites a Buffon. 



