76 LITERATURE OF THE SCYPHOMEDUSAE 



Scb-Order 2. Semostomae. 



Definition. — Tlio mouth is provided with four oral arms. The ten- 

 tacles are hollow, and generally long. 



FAiiiLY 3. Pelagidae. Genera — Pelagia, Per. Les. ; Chrysaora, Per. 

 Les. ; Dadylometra, L. Agass. Family 4. Cyaneidae. Genera — Pro- 

 cyanea, Hkl. ; Aledora, Couthouy ; Stenoptycha, L. Agass. ; Demionema, L. 

 Agass. ; Drymonema, Hkl. ; Cyanea, Per. Les. ; Patera, Less. ; Melusina, 

 HkL Fajxiily 5. Flo-SCULIDAe. Genera — Floscula, HkL ; Floresca, Hkl. 

 FAiiiLY 6. Ulmaridae. Genera — Ulmaris,}l\iL; Umbrosa,llhL; Undosa, 

 Hkl. ; Sthenonia, Esch. ; Phacellophora, Brandt ; Aurelia, Per. Les. ; 

 Aurosa, Hkl.; Auricoma, Hkl. 



Sctb-Order 3. Rhizostomae. 



Definition. — The mouth is obliterated by the central fusion of the 

 four bifurcated oral arms, and is functionally replaced by numerous suck- 

 ing mouths on their " oral " aspect ; tentacles are aljsent. 



Family 7. Toreumidae. Genera — Archirhiza, Hkl. ; Toreuvia, HkL ; 

 Polyclonia, L. Agass. ; Cassiopeja, Per. Les. ; Cephea, Fir. Les. ; Polyrhiza, 

 L. Agass. Family 8. Pilemidae. Genera — Toxodytus, L. Agas.?. ; Lych- 

 norhiza, Hkl. ; Phyllorhiza, L. Agass. ; Eupilema, Hkl. ; Pilema, Hkl. ; 

 Rhopilema, HkL ; Brachiolophus, Hkl. ; Stomolophus, L. Agass. ; Xedo- 

 pilema, Fewk. Family 9. Ver.suridae. Genera — Haplorhiza, HkL ; 

 Cannorhiza, Hkl. ; Versura, Hkl. ; Crossostoma, L. Agass. ; Cotylorhiza, 

 L. Agas.s. ; Stylorhiza, Hkl. ; Loborhiza, Vanhoffen. Family 10. Cram- 

 bessidae. Genera — Cramhessa, Hkl. ; JMastigias, L. Agass. ; Eucrambessa, 

 HkL ; Tliysanostoma, L. Agass. ; Himantostoma, L. Agass. ; Leptobrachia, 

 Brandt ; Leonura, Hkl. ; Cramborhiza, HkL 



Liteuatuke of Scvphomedvsae. 



1. Clarl-. (Lucernariae and their Allies.) Smithsonian Contrib. to Know- 



ledge, 242. 1878. 



2. Claus. (Studien. li. Polypen u. Quallen der Adria.) Denkschr. AkaJ. 



Wien, 1877. 



3. Ibid. (Unters. ii. Charybdaea marsupialis.) Arb. Zool. Inst. AVicn, 1878. 



4. Ibid. Unters. ii. d. Organis. u. Entwickb d. Medusen, 1883. 



5. Ibid. (Entwickl. d. Scyphostoma.) Arb. ZooL Inst. Wien, ix., x., 1891-93. 



6. Haeckel. System der Medusen, 1879-80. 



1. Ibid. (Deep Sea Modusae.) ChalL Rep. Zool. iv., 1882. 



8. Hertmy. (Organisnuis der MediLsen.) Denkschr. Ges. Jena, ii., 1878. 



9. Ibid. Nervensystem und Sinnesorgane der Medusen, 1878. 



10. Hesse. (Nervensyst. u. Sinnesorgane von Rbizostoma.) Zeit. wiss. ZooL 



\x., 1895. 



11. Jackson. Forms of Animal Life, pp. 780-790, 1888. 



12. Lankester. Encyclopaedia Britannica, ed. ix., Article Hydrozoa, 1881. 



13. Schewiakoff. (Beitr. z. Keuutnissd. Acalephenauges.) Morph. Jahrb. xv., 



1889. 



