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PROCEEDINGS OF THE 



[April, 1857 



EUDOXIA. Eschscholtz. 



Basal medusa with single bell-cavity ; usually helmet-shaped. 

 Digestive trunk single; that is, bearing no secondary digestive 

 trunks, but having a swim-bell besides tentaculiform and sexual 

 individuals growing from its walls ; the basal medusa disk serving 

 as a bract to this assemblage of individuals. The sexual indi- 

 vidual in each community appears to be solitary. The bell-rim 

 in the locomotive and sexual individuals is armed with four sharp- 

 pointed processes from which run up along the outer surface of 

 the disk, more or less distinct keels or raised lines towards the 

 attached extremity. 



Larva ? 



Distribution. Pacific Ocean ; Mediterranean and Adriatic Seas ; 

 South Atlantic and Charleston Harbor (?) 



EUDOXIA ALATA, nov. spec. 

 PI. 8, Ff. 9-10. 



The basal medusa of the community is small — the sexual me- 

 dusa large, and the swim-bell or locomotive medusa of medium 

 size. The four longitudinal keels of each of the two latter are 

 small, and placed, so far as I could ascertain, not equally distant 

 from each other, but two on each side nearer together than to 

 the other two. Their terminal processes are pointed and small, 

 the points turning outwards. 



The base is helmet-shaped, somewhat conical; concavity shal- 

 low, open on one side, where the rim of the depression is con- 

 tinued upward as two converging ridges towards the apex of the 

 cone. The tubular cavity (air-vessel) in the substance of this 

 base was of about two-thirds of its thickness in length. I did not 

 observe the digestive trunk. 



The sexual medusa is broad in proportion to its length, its 

 diameter being almost equal to its longitudinal axis. The longi- 

 tudinal keels appear to be arranged by two's as in the swim-bell. 

 One side of the medusa bulges out decidedly more than the other. 

 The two keels on the less bulging side are much enlarged near 

 the top of the bell, so as to form two conspicuous expansions, 

 whence I have derived the specific name. The sexual organ (in 

 both cases ovaries) was a fusiform appendage from the top of the 

 bell-cavity like the digestive trunk of the Tubularian Medusa, 



