158 PHYLUM CE@LENTERA. 
closely allied to Auveléa some, e.g. Pelagéa, have a direct development 
without the intervention of Scyphistoma or Strobila stages, but this 
may occur exceptionally in Azrelia, Cyanea is often very large, 
Fic. 76.—Lucernarta.—After Korotneff. 
“‘it may measure 74 ft. across the bell, with tentacles 120 ft. long.” 
Chrysaora is hermaphrodite, and has diffuse sperm sacs even upon 
the arms. In the Rhizostome, eg. Cass¢opeca and Pilema, the 
Fic. 77.—Diagram of Lucernaria.— 
After Allman, 
C., Cavity of gut (ccelenteron); #, gastric fila- 
ments; /7., hypostome; G., gonad; 7., tentacle; 
¢ ¢., circumference canal. 
mouth is obliterated, and replaced by numerous small pores on the 
four double arms. Lzcernaria and its allies are interesting sessile 
forms which have been compared to sexual Scyphistomas, that is, are 
regarded as persistently larval forms, 
