76 LITERATURE OF THE SCYPHOMEDUSAE 



SUB-ORDER 2. SEMOSTOMAE. 



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

 tacles are hollow, and generally long. 



FAMILY 3. PELAGIDAE. Genera Pelagia, Per. Les. ; Chrysaora, Per. 

 Les. ; Dactylometra, L. Agass. FAMILY 4. CYANEIDAE. Genera Pro- 

 cyanea, HkL ; Medora, Couthouy ; Stenoptycha, L. Agass. ; Desmonema, L. 

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

 Hkl. FAMILY 5. FLOSCULIDAE. Genera Floscula, HkL ; Floresca, Hkl. 

 FAMILY 6. ULMARIDAE. Genera Ulmaris, Hkl.; Umbrosa, Hkl.; Undosa, 

 HkL ; Sthenonia, Esch. ; Phacellophora, Brandt ; Aurelia, Pe"r. Les. ; 

 Aurosa, Hkl. ; Auricoma, Hkl. 



SUB-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 absent. 



FAMILY 7. TOREUMIDAE. Genera Archirhiza, Hkl. ; Toreuma, HkL ; 

 Polyclonia, L. Agass. ; Cassiopeja, Per. Les. ; Cephea, Pe"r. Les. ; Polyrhiza, 

 L. Agass. FAMILY 8. PILEMIDAE. Genera Toxoclytus, L. Agass. ; Lych- 

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

 Rhopilema, Hkl. ; Brachiolophus, Hkl. ; Stomolophus, L. Agass. ; Necto- 

 pilema, Fewk. FAMILY 9. VERSURIDAE. Genera Haplorhiza, HkL ; 

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

 L. Agass. ; Stylorhiza, Hkl. ; Loborhiza, Vanhoffen. FAMILY 10. CRAM- 

 BESSIDAE. Genera Crambessa, HkL ; Mastiyias, L. Agass. ; Eucrambessa, 

 Hkl. ; Tfi^ysanostoma, L. Agass. ; Himantostoma, L. Agass. ; Leptobrachia, 

 Brandt ; Leonura, Hkl. ; Cramborhiza, Hkl. 



LITERATURE OF SCYPHOMEDUSAE. 



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



ledge, 242. 1878. 



2. Glaus. (Studien. ii. Polypen u. Quallen der Adria.) Denkschr. Akad. 



Wien, 1877. 



3. Ibid. (Unters. ii. Charybdsea marsupialis.) Arb. Zool. Inst. Wien, 1878. 



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



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



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



7. Ibid. (Deep Sea Medusae.) Chall. Rep. Zool. iv., 1882. 



8. Hertwig. (Organismus der Medusen.) Denkschr. Ges. Jena, ii., 1878. 



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



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



Ix., 1895. 



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



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



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



1889. 



