34 Mr. F. S. Conant on the Cubomedusge. 



oral lobes, hanging down in bell-cavity a distance of between 

 one third and one half the height of bell ; very sensitive and 

 contractile, so that it can even be inverted into the stomacli. 

 The four phacelli, epaulette-shaped, springing from a single 

 stalk. Distance of tlie sensory clubs from tlie bell-margin 

 one seventh or one eighth the height of belh Velarium in 

 breadth about one seventh the dianieter of the bell at its 

 margin. Four velar canals in each quadrant ; each canal 

 forked at the ends, at times with more than two branches. 

 Pedalia flat, scalpel-sliaped, between one third and one half as 

 long as the height of bell. The four tentacles, when extended, 

 at least eight times longer than the bell. Sexes separate. 

 Height of bell 18-23 millim.; breadth about 15 mlliim. 

 (individuals with mature re|)roductive elements). Witliout 

 pigment. Found at Port Henderson, Kingston Harbour, 

 Jamaica. 



As may be seen from the above, G. xaymacana differs only 

 a little from the G. vmrsupialis of the Mediterranean. Claus 

 mentions in the latter a more or less 'svell-defiued asymmetry 

 of the bell, which he connects with a supposed occasional 

 attachment by the proboscis to algae. In G. xaymacana 1 

 never noticed but that the bell was perfectly symmetrical. 

 O. xaymacana is about two thirds the size given by Claus 

 for his examples of G. marsupialts, which were not then 

 sexually mature. It has 16 velar canals instead of 2-4 (32) 

 as given by Hteckel, or 2-4 as iigured by Claus. Difference 

 in size and in number of velar canals are essentially the 

 characteristics upon which Ha^ckel founded his * Challenger' 

 species G. Murrayana. 



Description of Tripedalia cystophora. (Fig. 2.) 



Genus Tripedalia: for the ])resent the characteristics of 

 family and genus must necessarily be for the most part the 

 same. The genus is distinguished by having 12 tentacles, in 

 4 inlcrradial groups of 3 each ; velarium sus[)ended by 4 pcr- 

 radial frcnula; canals in the velarium; stomach with rela- 

 tively well-developed suspensoria ; 4 horizontal groups of 

 gastric iilaments, each grouj) brush-shaped, limited to the 

 interradial corners of the stomach. 



Species : Tripedalia cystophora. 



Shape of bell almost exactly that of a cube with rounded 

 edges ; the roof but little arched. Proboscis with 4 oral 

 lobes ; hanging down in the bell-cavity generally more than 



