SCTPHOMEDUS.E RHIZOSTi )ME-E. 261 



umbrella edge, the number of lobes and marginal tentacles present 

 great variations. 



Fam. Ephyropsidae, Epli ri/upxi*. (Jgbr. (^'fnixifJinii Koll). Disc small and 

 like that of EpJii/rtt. with simplr gastric sacs, without oral arms, hut with eight 

 marginal tentacles. The genital organs (in four pairs) do not lie in umbrella 

 cavities. E. jii'litijii-ii Kiill., Mediterranean and Adriatic. 



Fain. Pelagidae. Pdinjin Per. Les. With wide gastric pouches and eight 

 long marginal tentacles in the iuterradii. No alternation of generations. P. 

 inn-til urn, Per. Les., Mediterranean. Cliri/xuiu-ti Per. Les.. with twenty-four 

 long marginal tentacles. The radial and intermediate gastric pouches are per- 

 ceptibly different. Cfn: lii/xuxr, II, / K~ch. Hermaphrodite. Xorth Sea and 

 Adriatic. 



Fam. Cyaneidse. Cijancn Per. Les. The tentacles are united in bundles 011 

 the under surface of the deeply lobed thick disc. There are sixteen (eight 

 radial and eight intermediate) more or less wide gastric pouches, which break 

 np near the end of the marginal lobes into small ramified vessels. C. cupilltitu 

 Esch. 



Fam. Aurelidae. Itixi-omnhixn (.'Is. With large oral arms, with branched 

 vessels and two marginal tentacles. Subgenital pits present. 1). luliti.tn Cls., 

 Adriatic. Aiiniin Per. Les.. with branched radial vessels and edge of disc 

 fringed with small tentacles. A. miritu L. {31<-<hixu miritu, L.), Baltic, North 

 Sea, Adriatic, etc. A.fl<iri<lnlti A'_ r .. coast of North America. 



2. Rhizostomece. No central mouth, funnel-shaped slits in the 

 eight oral arms and eight, rarely twelve, marginal bodies on the lobed 



O O / 



margin of the disc. There are 110 marginal tentacles. The central 

 mouth, which is at first present, becomes closed during the larval 

 development by the fusion of the edges of the lips. Funnel-like splits 

 are formed on the folded edges of the four pairs of arms, the so- 

 called suctorial mouths, by means of which microscopic bodies are 

 received into the canal system of the oral arms (fig. 195). 



Cuv. The arms end in simple tubular prolongations, and bear 

 accessory tufts at their bases. Rl. Curler! Per. Les., G-pliea Per. Les. The 

 branched oral arms have groups of iiematocysts and long filaments between 

 the terminal tufts, delicti- Per. Les. (Casxiopcn') borboniea Delle Ch., Medi- 

 terranean and Adriatic. 



CLASS III. CTENOl'HOUA.* 



Jfedusce of spherical or cylindrical, rarely band-shaped form ; with 

 <'u/1tf, meridional rows of vibratile plates formed of fused cilia. They 



* C. Gegenbaur. " Studieu fiber Organisation und Systematik der Cteno- 

 phorcn." An-Jiir. filr Xnt 11 r,/i'.^-]i.. IS.V!. L. Agassi/:. " Contributions to the 

 Natural History of the United States of America,'' vol. Hi., Boston. 1860. 

 A. Kowalevski, "BntwickelungsgescMchte der Rippenqnallen." Petersburg, 18iil>. 

 H. Fol, ' Bin Beitrag /,ur Anatomic und Entwicklungsgeschichte einiger Rip- 

 p.-n.|iiallcn,'' Inaugural dissertation. Jena. 1809. A. Agassiz, "Embryology 

 of the Ctenophone," Cambridge. U.S.. 1874. C. Chun, "Die Ctenophoren des 

 Golfes von Neapel," Leipzig. 1880. 



