PART I: SYSTEMATIC. 



It seems advisable first of all to establish the systematic position of 

 the two newly found species, Charybdea Xaymacana and Tripedalia 

 cystophora. Haeckel's classification, as given in his " System der 

 Medusen," is an excellent one and will be followed in this case. One 

 of the new species, however, will not classify under either of Haeckel's 

 two families, so that for it a new family has been formed and named the 

 Tripedalidse. In showing the systematic position of the two new forms, 

 an outline of Haeckel's classification will be given, so far as it concerns 

 our species, together with the additions that have been made necessary. 



(Haeckel, 1877). 



Characteristics : Acraspeda with four perradial sensory clubs which 

 contain an auditory club with endodermal otolith sac and one or several 

 eyes. Four interradial tentacles or groups of tentacles. Stomach with 

 four wide perradial rectangular pockets, which are separated by four 

 long and narrow interradial septa, or cathammal plates. Gonads in four 

 pairs, leaf -shaped, attached along one edge to the four interradial septa. 

 They belong to the subumbrella, and are developed from the endoderm 

 of the stomach pockets, so that they project freely into the spaces of the 

 pockets. 



Family I : CHARYBDEA (Gegenbaur, 1856). 



Cubomedusse with four simple interradial tentacles ; without mar- 

 ginal lobes in the velarium, but with eight marginal pockets ; without 

 pocket arms in the four stomach pockets. 



Genus: Charybdea. 



Charybdeida3 with four simple interradial tentacles with pedalia ; 

 with velarium suspended, with velar canals and four perradial frenula. 

 Stomach flat and low, without broad suspensoria. Four horizontal 

 groups of gastric filaments, simple or double, tuft or brush-shaped, 

 limited to the interradial corners of the stomach. 



