//. TYPES IN DETAIL IVITH THEIR SUBORDINATE GROUPS. 9 



duced. The polyps are protected 

 by cups formed of the perisarc. 

 The medusae possess otocysts and 

 genital organs on the radial canals. 

 X Campanularia. 

 Sub-order 3. Trachymedttsce . .'Fre&sviuarauvg medusae with ve- 

 lum, 4-6 radiating canals and other 

 characteristics of Hydro-medusae, 

 but with direct reproduction and 

 no polyp generation. 



X Liriope, Geryonia. 

 Sub-order 4. Siphonophora. . . Free-swimming colonies of poly- 

 morphic individuals representing 

 both types (polyp and medusa) and 

 characterized by a complex of sev- 

 eral individuals, known as a Cor- 

 midium. 



X Velella (with free medusae). 

 Physalia (with reduced medus», 

 which remain attached to the 

 colony). 



Class II. SCYPHOZOA Animals based upon the plan of a 



polyp with invaginated manubrium, 

 and with mesenteries, the Scyphula. 



Order i. Anthozoa Scyphula polyps which produce 



other polyps without medusa gen- 

 eration ; thus corresponding to the 

 AuthydrcB above. Mostly coral 

 producers. 

 Sub-order i. Hexacoralla. . . .Mesenteries and other parts in 6'. 



Some forms (the "sea-anemones") 

 produce no coral; others form at 

 the base of the polyps a solid mass, 

 often branched, and showing pits 

 and radiate partitions to mark the 

 site of the individual polyps. 



X Meiridium, Fungia. 



