ART. 20. TWO NEW INTESTINAL, TREMATODES TUBANGUI. 9 



developed. The acetabulum is 0.06 min. long by 0.085 mm. wide 

 and lies in extended specimens midway of the body length. Behind 

 the acetabulum is found the clinging plug which is elliptical in 

 shape, measuring 0.14 to 0.16 mm. long by 0.12 mm, wide and pre- 

 senting a deep central depression. The pharynx is 0.06 to 0.075 mm. 

 long and 0.045 to 0.055 mm. wide. The esophagus is very short and 

 the intestinal branches extend to near the posterior extremity of the 

 body. The excretory system is in the form of a network. The 

 testes are placed one in front of the other. The posterior testis occu- 

 pies a median position in the boundary between the anterior and 

 posterior body regions. The anterior testis may be pushed toward 

 the left side of the median line. The margins of both testes are 

 often slightly indented. Ventral to the testes, extending from the 

 level of the anterior testis to the posterior extremity of the body, lies 

 the elongated cirrus sac which encloses the vesicula seminalis, pars 

 prostatica and cirrus. The globular ovary is found ventral to the 

 anterior testis, toward the right side of the median line. The vitel- 

 laria are composed of large follicles which hide the posterior por- 

 tions of the intestinal branches in ventral view. They extend from 

 a level behind the acetabulum to the posterior end of the second 

 testis. A receptaculum seminis is lacking; Laurer's canal is long 

 and the vitelline reservoir lies between the two testes. The uterus is 

 short and contains large eggs (4 to 5 in number) which are 0.10 mm. 

 long by 0.06 mm. wide. The genital sinus is deep and relatively 

 roomy. 



Host. — Milvus parasiticus. 



Location. — Intestine. 



Locality collected. — Cairo, Egypt. 



PROHEMISTOMUM APPENDICULATUM Ciurea. 1916. 

 Plate 4, fig. 6. 



Specific diagnosis. — Prohemistomum : Length, 0.90 to 1.75 mm.; 

 width, 0.40 to 0.60 mm., measured at the level of the clinging plug. 

 The anterior region of the body or that region between the oral sucker 

 and the point of meeting of the ventral folds, measures 0.66 to 1.20 

 mm. long and 0.070 to 0.099 mm. thick in front of the acetabulum. 

 It is not sharply separated from the posterior body region which is 

 0.33 to 0.53 mm. long and which tapers posteriorly into a cylindrical 

 appendix. The cuticle of the entire anterior body region is pro- 

 vided with fine scales except on the clinging plug. The oral sucker, 

 0.055 to 0.090 mm. in diameter, is terminal with the opening toward 

 the ventral surface. The acetabulum, 0.050 to 0.085 mm. long by 

 0.065 to 0.095 mm. wide, lies almost midway of the body length. The 

 simple intestinal branches, from the level of the clinging plug to 



