.No. 2. — Studies from the Newport Marine Laboratory. 

 Communicated by Alexander Agassiz. 



XL. 



Some Variations in the Genus Eucope. By Alexander Agassiz and 



W. McM. WOODWORTH. 



We examined for various points nearly four thousand specimens of 

 Eucope (3,917). 



Among these we found nine specimens with only three radial canals, 

 twenty with five, and three with six radial canals. 



There were fourteen specimens in which one of the radiating canals 

 forked, the forking distal or proximal to the genitals being nearly equally 

 divided. 



No less than thirty-nine specimens showed distinct traces of serratiuns 

 or spurs from one or more of the radial canals. 



In eight specimens the radial serrations or spurs were not well defined, 

 and the position and number of the I'adial canals were indistinct. 



In eight specimens marginal tentacles were observed, which had be- 

 come united at the circular canal, sometimes with the tentacle next to 

 the tentacle with the otolith. 



In sis specimens there were marked spurs projecting from the base 

 of some of the marginal tentacles. 



In eight specimens there were two otoliths in each sense capsule. In 

 four there were three. 



In the other specimens the principal variations extended only to the 

 degree of development of the cycles of the marginal tentacles and of 

 the genital organs. The latter showed in some cases peculiar leaf-like 

 expansions extending laterally from the radial canals. 



The radial canals were four in number in an overwhelming majority 

 of the specimens examined. 



The study of some of the variations in the genus Eucope was under- 

 taken with a view of calling attention to the changes undergone in a 

 species of jellyfish, of which great numbers are always easily obtained 



VOL. xxx- — NO. 2. I 



