36 BULLETIN 69, UNITED STATES NATIONAL MUSI^UM, 



Female refroductioe organs. — The vagina {vag.) passes inwards 

 parallel with the cirrus pouch, and in older segments after crossing 

 the excretory canals dilates to form a small seminal receptacle. 



The 3^ oik gland {y. g.) is spherical about 40^ in diameter located 

 in the posterior part of the segment about in the median line. The 

 ovary {ov.) is a simple sac-like organ, spherical in shape, about GO/x 

 in diamater, and is in close relation with the yolk gland on the side 

 toward the genital pore and closer to the ventral surface than the 

 yolk gland. The uterus develops immediately in front of and dorsal 

 of the ovary and becomes a rounded simple sac-like organ. In front 

 of the uterus and in immediate relation with it a para-uterine organ 

 develops. The outer wall of the para-uterine organ is made up of 

 fibers running in a circular direction. Its contents have in some cases 

 a granular, in others a finely fibrous appearance. The uterus and 

 para-uterine organ, before the eggs have left the uterus, together 

 form an ovoid structure occupying most of the median field of the 

 segment. In the specimens which I have examined, this structure is 

 placed diagonally in the segment, the uterus posterior toward the 

 side of the segment on which the genital pore is located, and the 

 para-uterine organ toward the opposite anterior corner, except in con- 

 tracted segments, in which the axis of uterus and para-uterine organ 

 may be transverse. 



The eggs are few in number and spindle shaped. The oncosphere 

 measures from 20 to 25;U, in diameter. It is surrounded by two mem- 

 branes, an inner membrane prolonged at each pole into a long, slender 

 process, with finely granular contents and an outer membrane 30 

 to 36/x in diameter, prolonged at each pole into a long pointed process, 

 wihin which lies the prolongation of the inner membrane. 



Genus HYMENOLEPIS Weinland, 1858. 

 (For generic diaguosis see p. 91.) 



HYMENOLEPIS CANTANIANA (Polonio, i860) Ransom, 1909. 



Figs. 28, 29. 



Twnia cantaniana Polonio, lS60b, pp. 21-22. 



ifDavainea) cantaniana (Polonio) Blanchard, lS91t, pp. 439^40. 

 Davainea oJigophora Magalhaks, lS9Sc, pp. 445-449, figs. 1-6. 

 Davainea cantaniana (Polonio) Railliet and Lucet. lS99a. p. 146. 

 This species, which occurs in turkeys, chickens, jDheasants {Phasi- 

 anus colchicus), and peafowls (a host hitherto unrecorded), is one 

 concerning which there has been considerable discussion. 



It was originally described by Polonio (1860b, pp. 21-22). His 

 description translated reads as follows: 



T. cantaniana PoJonio. Head globose, nnibonate in tbe center; snckers placed 

 at eqnal intervals about tbe major circumference of tbe bead; neciv absent; 



