32 Mr. F. S. Conant on the Cubomedusae. 



CUBOMEDUSiE (Hseckel, 1877). 



Acraspeda with four perradial marginal bodies, which con- 

 tain an auditory club with endodcrmal otolith-sac and one or 

 several eyes. Four intcrradial tentacles or groups of tentacles. 

 Stomach with four wide perradial rectangular pockets, which 

 are separated by four long and narrow intcrradial septa. 

 They belong to the subumbrella, and are developed from the 

 endoderm of the stomach-pockets, so that they project freely 

 into the space of the pockets. 



Family I. Charybdeidse (Gegenbaur, 1856). 



Cuboraedusse with 4 simple intcrradial tentacles ; without 

 marginal lobes in the velarium, but with 8 marginal pockets ; 

 without pocket-arms in the 4 stomach-pockets. 



Family II. Chii-odropidae (Hgeckel, 1877). 



Cubomedusfe with 4 intcrradial groups of tentacles ; with 

 16 marginal pockets in the marginal lobes of the velarium, 

 and with 8 pocket-arms, belonging to the exumbrella, in the 

 4 stomach-pockets. 



(This family is represented in American waters by a species 

 of Chiropsahnus found at Beaufort, N.C., and identified by 

 H. V. Wilson as Ch. qtiadrumana. Before Claus's paper on 

 Charyhdea marsupialis was received at the Laboratory, Pro- 

 fessor Wilson had gone over precisely the same ground on 

 Chiropsahnus^ but with results so similar to those of Chius 

 that, when the latter's article came, he did not finish for 

 publication the notes and drawings he had made.) 



To accommodate the second species found in Kingston 

 Harbour another family must be added to the preceding. 



Family III. Tripedalidae (1897). 



Cubomedusae with 4 intcrradial groups of tentacles, each 

 group having 3 tentacles carried by 3 distinct pedalia ; 

 without marginal lobes in the velarium ; with 16 marginal 

 pockets ; without pocket-arms in the stomach-pockets. 



Description of Charyhdea xaymacana. (Fig. 1.) 



Genus Charyhdea (ace. to Ha^ckel) : Charybdeida3 with 4 

 simple intcrradial tentacles, with pedalia ; with velarium 

 suspended, with velar canals and 4 perradial frenula. 

 Stomach fiat and low, without broad suspeusoria. Four 



