AGASSIZ AND WOODWORTH : VARIATIONS IN EUGOPE. 147 



EXPLAXATIOX 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. 1. Adult male, with equally developed genitals, their formula being 1, 1. 1, 1, 

 Fig. 2. Adult male, with only three fully developed genitals, their formula being 



1, 1, 1,4, 

 Fig. 3. .Male, with the genital formula 1, 2, 3, 4, all in different stages of 



development. 

 Fig. 4. Female with two atrophied genitals, formula being 1, 1, 0, 0, 

 Fig. 5. Male of the formula 1, 1, 3, 4, 

 Fig. 6. Male with only one large genital pouch, with the formul.i 1, 4, 4, 4, 



PLATE II. 



Fig. 1. Male, with two atrophied genital organs, and with unequally developed 

 radial canals, three of which have spurs running at a slight angle 

 from them. 



Fig. 2. Male, with unequally developed genitals, and with one radial canal forking 

 both above and below the genital pouch. 



Fig. 3. Young Eucope with undeveloped genital organs. 



Fig. 4. Male Eucope with spurs on two of the radial canals, with unequally de- 

 veloped genitals. 



Fig. 5. Female with only two fully developed genital pouches, and one atrophied 

 radial canal. 



Fig. 6. Male with genital formula 1, 1, 1, 0, 



