148 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



PLATE m. 



Figures of Eucope having three or more radial canals, and forking either above 

 or below the genital organs. 



Fig. 1. Eucope with three radial canals, one of which forks at the extremities of 

 the heart-shaped genital pouch. 



Fig. 2. Male Eucope with four radial canals, also forking at the genital pouch. 

 Nearly equally developed genitals. 



Fig. 3. Female Eucope with tliree radial canals, one of which sends off a prom- 

 inent spur above the rudimentary genital pouch. Genitals very un- 

 equally developed. 



Fig. 4. Male with three radial canals, one of which forks well above the genital 

 organs of the branches. Genital organs nearly equally developed. 



Fig. 5. Male witli four radial canals. The genital organs corresponding to the 

 forks of one of the canals are barely united. Genital pouch atrophied 

 in one quadrant. 



Fig. 6. Male Eucope with three unequally developed genital organs. 



PLATE IV. 



With figures of Eucope having five or more radial canals. 



Fig. 1. Female Eucope with five radial canals and the same number of un- 

 equally developed genital pouches, with the formula 1, 2, 3, 4, 5, 



Fig. 2. Young male Eucope with five radial canals, unequally developed genitals, 

 and a si.xth rudimentary radial canal. 



Fig. 3. Female Eucope with five radial canals, two fully developed genital 

 pouches, one less so, and two radial canals without genital organs. 



Fig. 4. Female Eucope with five radial canals, and only one fully developed gen- 

 ital pouch. 



Fig. 5. Female Eucope with five radial canals, one of which is atrophied below 

 the genital pouch. Genital organs unequally developed. 



Fig. 6. Female Eucope with five radial canals and unequally developed genitals, 

 one of the canals having no genitals, and forking. 



PLATE V. 



Fig. 1. Male Eucope with five radial canals and five nearly equally developed 

 genital pouches. 



Fig. 2. Male Eucope with five radial canals and traces of a sixth, and very un- 

 equally developed genitals. 



Fig. 3. Female Eucope with five radial canals subdividing the disk into very 

 unequal segments, only two of the genital organs fully developed. 



Fig. 4. Female Eucope with unequally developed genitals, but with five very 

 symmetrical segments. 



