NO. 1844. 



CE8T0DE FROM AFRICAN BUSTARD— RANSOM. 



641 



about the same frontal and horizontal planes as the seminal recep- 

 tacle, and about half way between the latter and the median line. 

 The uterus (fig. 5, ut.) develops on the dorsal side of the ovary. 

 When fully developed the uterus (fig. 4, ut.) occupies most of the 

 medullary portion of the segment in the posterior half, extending 

 laterally almost to the longitudinal excretory vessels. Numerous 

 infoldings or proliferations from the wall of the uterus penetrate 

 among and surround the eggs in such a manner that they appear in 

 some cases to be inclosed in separate chambers. In the anterior 

 portion of the segment the medullary parenchyma becomes modified 

 to form a para-uterine organ (fig. 4, par. ut.), which laterally extends 

 a variable distance on each side toward the longitudinal excretory 





sem.fec. 



Fig. 5.— Sphyf.oncot.enia xjncinata. Transverse section of sexually mature segment, c. p., 

 cirrus pouch; ex., excretory vessel; I. n., lateral longitudinal nerve; ov., ovary; sem. rec, 



SEMINAL RECEPTACLE; 6. g., SHELL GLAND; t., TESTICLES; t. m., TRANSVERSE MUSCLES; Ut., PRIMORDIUM OF 



uterus; vag., vagina; v. d., vas deferens; y. g., yolk gland. Enlarged. 



vessels and antero-posteriorly from the anterior limits of the uterus 

 to the anterior end of the segment. The tissue of the para-uterine 

 organ contains numerous calcareous corpuscles. Whether the para- 

 uterine organ is functional to the extent that the eggs are finally 

 pressed into it from the uterus and become encapsuled by it, is un- 

 certain, as this condition does not obtain in any of the specimens 

 examined. The eggs (fig. 7) are round or oval with thin shells, at least 

 two in number, an outer shell measuring 70 by 40 /< to 80 by 55 u in 

 diameter, and an inner shell, measuring 45 by 35 /t to 64 by 40 a in 

 diameter, thinner than the outer shell, and closely investing the onco- 

 sphere. The hooks of the oncosphere measure 25 to 30 u in length. 



Host. — Neotis caffra (Lichtenstein). 



Location. — Lower intestine. 



Locality collected. — British East Africa. 

 S0796 — Proc.N.M.vol.40— 11 41 



