594 
DR. NELSON ON THE REPRODUCTION OF THE ASCARIS MYSTAX. 
PLATE XXX. 
Fig-. 84. Ovum enclosing an embryo, s. The overlapping extremities. Magnified 
330 diameters. 
Figs. 85, 86. Ova containing young worms variously coiled. Magnified 330 dia- 
meters. 
Figs. 87, 88. Ova in which the worms have arrived at the period of hatching. 
f. The three layers of the chorion, p. The worm enclosed in its cuticle, 
forming nearly two turns of a spiral, by reversing which, the chorion is 
ruptured, r. Clear fluid surrounding the worm. Magnified 330 dia- 
meters. 
Fig. 89. The embryo worm just escaped from its shell, o. The untransformed 
granules which constitute its body. p. The thick enveloping cuticle. 
s. The three-lobed mouth. Magnified 330 diameters. 
Fig. 90. The glandular portion of the female reproductive apparatus in which the 
ovula are fertilized. Magnified 40 diameters, h. The lower portion of 
the ovary filled with an opake mass of ovules, c. The first or upper con- 
striction, between the ovary and the oviduct, and indicating the origin of 
the oviduct, d. The lower or second constriction, being the spot where 
the oviduct terminates by entering the uterus, f. The fundus of the uterus 
filled with ova in various stages of development. 
Fig. 91. Portion of the body of a female Ascaris mystax, showing the orifice of the 
vagina, a. The simple circular opening, by which the vagina terminates. 
Magnified 60 diameters. 
Fig. 92. The whole reproductive apparatus of the female Ascaris mystax, natural 
size. a. The delicate caecal extremities of the ovaries, h. The lower 
portions of the ovarian tubes filled with ovules, and opake. c. The com- 
mencement of the oviduct, d. The termination of the same. f. The two 
uteri distended with ova. g. The single tapering vagina formed by the 
union of the two uteri. • 
