798 PROF. J. R. GREENE ON A RARE MEDUSA. [Dec. 16, 



Carybde.e (Carybdea, Obelia) and Marsupiale.e {Marsupialis, 

 Bursarius, Mitra, Eurybia, Cytceis, Campanella, Scyphis). He has 

 "associated with both of them several species which have not the 

 remotest affinity with the type," 



Lutken 1 , in a critical revision of the lower Medusae, places Ca- 

 rybdea at the head of his family JEgi?ie<z. Burmeister follows him. 



Gegenbaur 3 differs both from Lesson and Lutken. He establishes 

 the family Charybdeidce, placing it with the higher Medusae (his 

 Acraspeda). 



Fritz Midler 4 discusses the structure and classificatory value of the 

 peculiar gastric tentacles of the higher Medusae. In a later essay 5 

 he proposes the following arrangement. 



iEGiNoroA (iEginese, Lutk.). 



a. Lower. Cuniua (iEgina rosea, Escksch.) ; iEgineta ; Polyxenia ; JEgi- 



nopsis biteri taculata. 



b. Higher: Char ybdc idm. iEginopsislaurentii(?); yEgina(citrea) ; Charybdea 



(marsupialis) ; Taruoya ; Peripbylla (Ch. peripbylla, Per.). 



The jEyinoida here constitute an order of Hy drome dusce, equiva- 

 lent to the orders Siphonophora, Hydroida, and Acalephce (R. 

 Leuc)ifirt, = P/ianerocarpce, Eschsch.). Fritz Miiller has conscien- 

 tiously endeavoured to group the results of his own investigations 

 with every regard to the labours of his predecessors. 



Agassiz ( I8G2) more fully expresses somewhat similar opinions ir 

 the annexed tabular view (here condensed) 6 . 



Order DISCOPHOR^. 



Suborder 1. RiiizostomEjE. 

 Suborder 2. SEiiioSTOMBi 

 Suborder 3. Haplostome,e. 



1st Family. Thalassantheje, Lesson (=2Eginida3). 

 2nd Family. Brandtid.£, Agass. 

 Dodecabostryeha, Brandt. 

 Quoyia, Agass. (=Carybdea bicolor, Q. §■ G.). 

 3rd Family. Chakybdeid.e, Less. 



Cbarybdea, Less., after P. 8f L. ( = 0. peripbylla only). 

 4tb Family. Maesupialid*, Less. 

 Marsupialis, Less. ( = M. planci). 

 Tamoya, Fritz Midler. 

 T. haplonema. 



T. alata ( = Carybdea alata, Beynaud). 

 Bursarius, Less, 1836 (A misprint for 1830). 

 Cbiropsalmus, Agass. (=Tamoya quadrumana). 

 5th Family. Luceekariad*, Johnst. 



1 Nogle Bemaerkninger om Medusernes systematiske Inddeling, navnlig med 

 Hensyn sil Forbes's History of Brittish naked-eyed Medusae. Kiobenhavn 

 Vidensk. Medd. 1850, pp. 15-35. See p. 27. 



2 Zoonomiscbe Brlefe, erster Tlieil, p. 168 (1856). 



3 Op. cit. (' Versuch '). 4 Op. cit. (1859). 



5 Op. cit (1862). 



6 From vol. iv. of his ' Contributions to the Natural History of the United 

 States of North America.' The ' Second Monograph ' (vols. iii. & iv.)is devoted 

 to the Acalepbs. Seeing the value and beauty of this admirably illustrated 

 work, facile princeps among treatises on the Hydrozoa, one regrets that no 

 living Charybdeidas were studied by the author in person. 



