Plate 48. 



Chart of the route, with stations occupied, showing the geographic distribution of 

 intermediate Medusae. For explanation of species to which the various colors correspond, 

 see legend on the chart itself. The occurrence of Atolla (red) and of Periphylla (brown) 

 in the Gulf of Panama and in the Gulf of California is plotted from the records of the 

 expedition of the " Albatross " in 1891. 



No attempt is made to illustrate the quantitative distribution of any of the species. 

 To agree with the text the following names in the legend should be altered : — Colo- 

 bonema typicum to C. sericeum; Laodicea erythrogonon to Ptychogena erythrogonon. 



The heavy dotted line corresponds to the southern limit of good trawl hauls. 



