No: 4374) “WORTH AMERICAN INVERTEBRATES. 3243 
made from a wide range of New England coast waters show every feature 
of intergradation between the several extremes and sufficiently establish the 
fact that at most only C. versicolor, of the Carolina coast, has possibly a 
varietal distinctness. 
In this connection it is pertinent to refer to the morphological variation 
in the common species. C. arctica, which is nearly as marked as in Aurelia, 
including variation in the radial symmetry, number of gonads, oral arms, 
etc. Variation in color is sufficiently indicated in the references just given. 
Pelagia cyanella Per. & Les. Fig. 6. 
Fic. 6. Pelagia cyanella Per. & Les. 
Umbrella disk-like, with rather highly arched aboral surface; marginal 
lobes 16, and with 8 rhopalia and 8 tentacles symmetrically and alternately 
disposed at the lobular sinuses. Gonads 8, forming conspicuous pouch-like 
masses within the gastric pouches of the tentacular radii. Manubrium 
large and pendulous, with four frilled oral arms approximately as long as 
the tentacles. 
Color.— Disk translucent bluish tint, sprinkled with reddish-brown, pig- 
ment spots over the entire exumbrellar surface, the more numerous near 
