76 LITERATURE OF THE SCYPHOMEDUSAE 



SUB-ORDER 2. SEMOSTOMAE. 



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

 tacles are hollow, and generally long. 



FAMILY 3. PELAGIDAE. Genera Pelayia, 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, Per. 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, Pdr. Les. ; Cephea, Pdr. Les. ; Polyrhiza, 

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

 norhiza, HkL; Phyllorhiza, T, Agass.; Eupilema, HkL; Pilema, Hkl.; 

 llhopileina, HkL : Brctchiulophus, Hkl. ; Stomolophus, L Agass. ; Necto- 

 pilema, Fewk. FAMILY 0. VERSURIDAE. Genera Haplorhiza y HkL ; 

 Cannorhiza, Hkl. ; Veraura, HkL ; Crossostoma, L. Agass. ; Cotylorhiza, 

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

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

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

 Brandt ; Leonura, HkL ; Cramborhiza, HkL 



LITERATURE OF SCYF-HOMEDUSAE. 



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



ledge, 242. 1878. 



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



Wien, 1877. 



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



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



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



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



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



8. Hcrtwig. (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. Lankcster. Encyclopaedia Britannica, ed. ix., Article Hydrozoa, 1881. 



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



1889. 



