BIGELOW: COAST WATER EXPLORATION OF 1913. O29 
That is to say, it was only in the waters of the Gulf Stream or over the 
outermost part of the continental shelf that they formed an important 
constituent of the pelagic fauna. The genus Liriope is also usually 
classed as among the typically oceanic Medusae. And this is cer- 
ig 
i 
a 
~ 4S 
Fie. 81.— Distribution of oceanic Medusae and siphonophores, July—August. 
1913. 
A, Aglaura hemistoma; D, Aglantha digitale; d, Diphyes; ©, Agalma 
elegans; r, Rhizophysa filiformis; ce, Geryonia; n, Niobia dendrotenta- 
, cula; o, Agalma okeni; pe, Physophora; 
Stephanomia cara. 
R, Rhopalonema velatum; s, 
\ 
| . . . ., probable limit to tropical species in July. 
| 
, 8, probable limit 
to Aglantha digitale. 
inly true of L. tetraphylla. But the species found off Chesapeake 
vay, L. scutigera (p. 316), is so common in southern harbors.and bays, 
lat it can hardly be considered as oceanic. Agalma elegans, too, 
— 
