SEMAEOSTOME^E DACTYLOMETRA. 



587 



tacles. R. P. Bigelow, 1880, states that the so-called " Chrysaora " of the Chesapeake, which 

 is only a brackish-water, abortive variety of Dactylometra, develops trom an ephyra through a 

 Pelagia stage, wherein it has only 8 tentacles and 16 lappets, and Brooks has figured the ephyrae 

 in the text figures here shown. 



The present writer found considerable numbers of Chrysaora-like medusae in Hampton 

 Roads and Norfolk Harbor, Virginia, and in St. Mary's River, Maryland, early in Novem- 



FIG. 372. Young ephyra of Daclylametra quinquccirrha. Figures drawn by the late Prof. William K. Brooks at the 

 Chesapeake Bay Laboratory of the Johns Hopkins University. Presented by the Department of Biol- 

 ogy of the Johns Hopkins University for publication in this work. 



ber, 1904 and 1905. These were generally pale milky-yellow in color and lacked the rich 

 brown pigment and the 16 pigmented, radial areas seen upon the exumbrella of Dactylometra 

 fjuinrjufdrrha. Others had a red-brown spot at the apex of the exumbrella, and surrounding 

 this was a star-like zone of red-brown streaks with pointed ends directed outward. The 



