BIGELOW: COAST WATER EXPLORATION OF 1913. 



325 



That is to saj', 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- 



FiG. 81. — Distribution of oceanic Medusae and siphonophores, July-August. 

 1913. 



A, Aglaura hemistoma; D, Aglantha digitale; d, Diphyes; e, Agalma 

 elegans; f, Rhizophysa flliformis; g, Geryonia; n, Niobia dendrotenta- 

 cula; o, Agalma okeni; p, Pliysophora ; r. Rhopalonema velatum; s, 

 Stephanomia cara. 



..... probable limit to tropical species in July. , S, probable limit 



to Aglantha digitale. 



tainly true of L. tetraphyUa. But the species found off Chesapeake 

 Bay, L. scutigera (p. 316), is so common in southern harbors and bays, 

 that it can hardly be considered as oceanic. Agalma elegans, too. 



