12 



MEMORIAL PAMPHLET SHOWING CERTAIN DRAWINGS 



Were it not for the absence of ocelli I would be inclined to regard this medusa as a 

 hypertrophic specimen of Staurodiscus tetrastaurus in which the side branches of the 4 

 primary radial-canals had reached the circular vessel and 4 intermediate canals had 

 developed. I have, however, never observed such a condition among many hundreds of 

 apparently mature medusae of S. tetrastaurus found at Tortugas, Florida ; and it seems 

 probable therefore that Professor Brooks's medusa is a new species which may have been 

 derived from a Staurodiscus-like ancestor. 



FIG. 160. Eutima mira, after Brooks, in Mem. Boston Soc. Nat. Hist., 1886. Small figures are of natural size 



and illustrate attitudes of the medusa. 



