AGASSIZ AND WOODWORTH: VARIATIONS IN EUCOPE. 147 
EXPLANATION OF PLATES. 
Plates I. VI., from photographs taken by W. McM. Woodworth. 
PLATE I. 
To illustrate the variation in the development of the genital organs. The diame- 
ter of the disk of the specimens of Eucope figured varied from 3.5 to 4.5 mm. 
Fig. 
Fig. 
Fig. 9 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Adult male, with equally developed genitals, their formula being 1, 1, 1, 1, 
Adult male, with only three fully developed genitals, their formula being 
1, 1, 1, 4, 
Male, with the genital formula 1, 2, 3, 4, all in different stages of 
development. 
Female with two atrophied genitals, formula being 1, 1, 0, 0, 
Male of the formula 1, 1, 3, 4, 
Male with only one large genital pouch, with the formula 1, 4, 4, 4, 
PLATE II. 
Male, with two atrophied genital organs, and with unequally developed 
radial canals, three of which have spurs running at a slight angle 
from them. 
Male, with unequally developed genitals, and with one radial canal forking 
both above and below the genital pouch. 
Young Eucope with undeveloped genital orgaus. 
Male Eucope with spurs on two of the radial canals, with unequally de- 
veloped genitals. 
Female with only two fully developed genital pouches, and one atrophied 
radial canal. 
Male with genital formula 1, 1, 1, 0, 
