Mr. F. S. Conant on the CubomedusEe. 



33 



horizontal groups of gastric filaments, simple or double, tuf't- 

 or brush-shaped, limited to the interradial corners of the 

 stomach. 



Fig. 1. 



Charybdea xaymacana. 



Reference letters in Fiyures. 



aj-, furrow on inner surface of exumbrella underlying the adradial ridge 

 on the outer surface ; afr', fun-ow on outer surface, setting off the 

 area in which the sensory niche lies ; ct, canal of the tentacle ; go, 

 pastric ostium ; ifr, interradial furrow on outer surface ; n, nerve- 

 ring on the subunihiella ; joe, pedalium ; ;j7i, phacellus ; ^)?-, proboscis ; 

 »•, reproductive organ ; sn, sensory niche ; siij suspensorium j sub 

 subumbrella ; vc, velar canals. 



Species : Charybdea xaymacana. 



Bell a four-sided pyramid, with the corners more rounded 

 than angular, yet not so rounded as to make the umbrella 

 bell-shaped. The sides of the pyramid parallel in the lower 

 two thirds of the bell, in the upper third curving inward to 

 form the truncation ; near the top a slight horizontal con- 

 striction. Stomach flat and shallow. Proboscis with four 



Ann. & Mag. N. Hist. Ser. 7. Vol. i. 3 



