IV 



PHYLUM CCELENTEEATA 



177 



ORDER 2. CORONATA* 



This group includes a number of rare and beautiful Medusae of curiously 

 complex structure, of which Pericolpa may be taken as an example. The 

 umbrella (Fig. 133) is usually conical, and is divided by a horizontal furrow 



Fid. 131. Tessera princeps. A, external view ; B, vertical /section. ff./..gastricifilament ; 

 gon. gonad ; i.r. t. inter-radial tentacle ; mnb. manubrium ; jnih. mouth ; p.r. t. per-radial 

 tentacle ; st. stomach ; in. trcniole. (After Haeckel.) 



FIG. 132. Lucernaria. A, oral aspect ; B, from the side. g. foot-gland ; g.f. gastric 

 filaments ; gon. gonad ; mth. mouth ; t. tentacles ; In. tamioles. (After Glaus.) 



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