Bull. U. S. F. C. 1899. (To face page 304.) 
Plate 34 , 
Epibdella bumpusii sp. nov. from the exterior of JDasyatis centrura. 
11. Ventral view of specimen mounted in balsam, x 4. 
12. Ventral view of anterior half of same showing the arrangement 
of the genital organs, partly diagrammatic, x 38. 
c', Aperture of cirrus; cur portion of uterus where the eggs are 
molded and the shell laid on; gel, germ duct at the point where 
it is joined by the short yolk duct (see yd, tig. 14) ; yd', germ duct 
at the point where it is joined by the seminal duct; sr, seminal 
receptacle; id, opening of uterus; v, opening of vagina; i/r, vitel- 
line reservoir. 
The line from o indicates a part of the ovary in which the germ 
cells were free to move and were always thrown into a state of 
oscillation by the rush of yolk from the reservoir (yr) which 
preceded the formation of each egg. 
The line sr touches the seminal vesciele at a point where a 
regular pulsation was observed, which still continued in a speci- 
men which had been lying in sea water for twelve hours, most 
of the time under a cover glass. 
13. A pair of hooks from the posterior sucker, x 68. 
14. Transverse section through the ovary and yolk reservoir, x 100. 
cd. Germ duct at the point where it is joined by the short duct 
from the yolk reservoir (yr); yd, germ duct; o', beginning of the 
germ duct in the ovary in which oscillating germs were observed 
in the living specimen. 
15. Germ cell, x 800. 
