NO. 1844. 



CESTODE FROM AFRICAN BUSTARD— RANSOM. 



639 



I mm. 



Fig. 2.— Sphyroncot^nia uncinata. Head, considerably flattened 

 by pressure. enlarged. 



distance posterior of the middle of the lateral margin of the segment. 

 (Fig. 4, g. p.) The cortical parenchyma and longitudinal musculature 

 are well developed, in sexually mature segments comprising two- 

 thirds of the thickness of the strobila. (Fig. 5.) Transverse mus- 

 culature well developed (fig. 5, t. m.) Lateral longitudinal nerves 

 prominent. (Figs. 

 5, 6, 1, n.). Ventral 

 excretory vessels 

 (figs. 4, 5, ex.) large, 

 located a consider- 

 able distance from 

 the edge of the 

 strobila, and con- 

 nected by a trans- 

 verse commissure 

 in the posterior por- 

 tion of each seg- 

 ment. Dorsal ex- 

 cretory vessels ab- 

 sent or so much 

 reduced in size as 

 to be no longer ap- 

 parent in sexually 



mature segments. Genital canals (fig. 5) pass ventral of the excre- 

 tory vessel and nerve. 



Male reproductive organs. — Testicles (fig. 5, t.) numerous (over 80), 

 confined to the median portion of the medullary parenchyma; the 

 mass of testicles, extending from the transverse excretory vessel for- 

 ward nearly to the anterior limits of 

 the segment, is dorsal in portion except 

 posteriorly where it occupies the ventral 

 as well as the dorsal portion of the 

 medullary parenchyma. Vas deferens 

 (fig. 5, v. d.) forms a mass of coils on 

 the median side of the ventral longitu- 

 dinal excretory vessel a short distance 

 in front of the plane of the genital pore, 

 then passes outward and backward on 

 the ventral side of the excretory vessel 

 and enters the base of the cirrus pouch. 

 (Figs. 5, 6, c. p.) Cirrus pouch elon- 

 gated, pyriform, about 250 /i long. Cirrus when evaginated meas- 

 ures about 50 ix in diameter, armed with numerous curved spines 

 10 to 12 n long. Cirrus pouch opens into the bottom of a deep 

 genital cloaca which measures 150 p. or more in depth. 



50JLA 



flg. 3.— sphyroncot.enia uncinata. 

 Hook from rostellum. Enlarged. 



