132 



COELEXTERATA. 



Th 





Order 4. CAMPANULARIAE* (CALYPTOBLASTEA). 



With hydrothecae and gonanyia. Colonial. Generative individuals, 

 when set free, are Leptomedusae. 



The Campanulariae are colonial Hydromedusae, and they all 

 produce gonophores by budding. The zooids are provided with 

 hydrothecae (Fig. 114), which, in the case of the blastostyles, form 

 gonangia. The gonophores are either set free as Medusae, or are 



only partially developed 

 as Medusoids (hedrio- 

 blastic), with rudiments 

 of the medusan organs. 

 The Medusae generally 

 have marginal auditory 

 organs of the vesiculate 

 type, and their gonads 

 lie beneath the radial 

 m fiW canals (Fig. 106). 



Section 1. Campanularinae. 



Hydrothecae at least in 

 the proximal part of the 

 colony never adnate by their 

 sides to the hydrocaulus. 



Fam. 1. Haleciidae. Hy- 

 drothecae reduced to shallow 

 saucer-shaped pedunculate 

 appendages (hydrophores). 

 Hydranths with conical 

 hypostome. Gonophores 

 hedrioblastic. Halecium 

 Oken ; Diplocyathus Allm. ; 

 Ophioidcs Hincks. 



Fain. 2. Campanularidae. 

 Hydrothecae borne by pe- 

 duncles, campanulate or 

 tubular. Hydrocaulus not 

 enveloped by peripheral 

 tubes. Gonophores free- 

 swimming or sessile. Campanularia Lamarck ; Obelia Peron and Lesueur ; 

 Thyroscyphus Allm. ; Hypantliea Allm. ; Calampliora Allm. ; Hebella Allm. ; 

 Halisiphonia Allm. ; Coppinia Hassall ; Calycella Hincks ; Clytia Lamouroux ; 

 Campanopsis Glaus ; Melicertaria Haeckel ; Lovenella Hincks ; Cuspidella 

 Hincks; Tkaiimantiu-s Esch. ; Campanulina v. Ben.; Leptoscyphus Allm. 



* T. Hincks, A Monograph of the British Hydroid Zoophytes, London, 1868. 

 G. J. Allman, "Report on the Hydroidea," Pts. 1 and 2, Challenger Reports, 

 1883 and 1888. E. Haeckel, Monographic der Medusen, Jena, 1879. 



FIG. 114. Branch of an Obelia colony (0. gelatinosa). 

 mouth of a nutritive polyp with extended tentacles ; 

 M medusa-buds on a blastostyle in a gonatheca ; Th 

 hydrotheca. 



