IIYDROZOA. 



99 



4« 



Nectocalyces horse-shoe shaped . 



Nectocalyces concave externally, " and pro- 

 duced into five points of which the three 

 upper are much longer and stronger than 

 the two lower." ..... 



Hippopodius. 





Vogtia. 



Hipp 



and Vogtia have 'in- 



complete 5 hydroecia, the nectocalycine groove along 

 which the coenosarc glides not forming, in these 

 genera, a closed canal. In Praya, however, the 



rar 



their open grooves so applied to each other as to 

 form, by their apposition, a short tube {fig. 4, d). 



The poly pites and tentacles of the several genera 

 of Calycophoridce present no very striking differ- 

 ences of structure. 



Not so, however, the hydrophyllia. Abyla, the 

 genus most closely allied to Mphyes, is distin- 



me 



calyces, but also in having thick, facetted, hydro- 

 phyllia, the edges of which do not overlap one 

 another. In Diphyes the hydrophyllia are folia- 

 ceous, smooth externally, slightly convex, and folded 

 so that their edges freely overlap. 

 In Pray a, " each 



ium is a thick, 

 gelatinous, and reniform body, bent upon itself, 

 rounded and solid at one extremity, and divided 

 at the other into a median thick and two lateral 

 lamellar lobes. The phyllocyst is prolonged into 

 four caecal processes." But in Vogtia, Hippopo- 

 dius, and, perhaps also, Sphceronectes, these or- 

 gans are absent altogether (fig. 20, b). 



The reproductive bodies of the Calycophoridce 

 are always medusiform, and attached to the pe- 

 duncles of their respective polypites. In Vogtia 



Hippopodius 



h 2 



