ig Art. 8.— S. Goto and Y. Matsudaira : 



the hind end of body, dorsal to acetabulum; paired excretory 

 vessels proceeding from anterolateral corners of the vesicle. 



D. papillalum. Body smooth except for the sensory papilla?, 

 about 3.5 mm. long, 0.6 mm. wide, cylindrical, with a conspicu- 

 ous excretory papilla on the dorsal median line close to the hind 

 end of body. Oral sucker usually ellipsoidal, length 0.25-0.3. 

 mm., width 0.25-0.28 mm.; acetabulum comparatively small, 

 ellipsoidal, length 0.48-0.53 mm., width 0.42-0.51 mm., opening, 

 ventral, I-shaped. Prepharynx describing a double U, one with- 

 in the other, the inner U continued to the oral sucker, the outer to 

 the pharynx; pharynx subglobular or ellipsoidal, 0.28-0.37 mm. in 

 diameter, very muscular, at hind end of prepharynx, between the 

 anterior and middle third of body; intestinal cseca immediately fol- 

 lowing the pharynx, elongated ovate when viewed dorsoventrally, 

 with the attenuated end directed backwards, the two communi- 

 cating with each other by a wide passage immediately behind the 

 pharynx, only about one-half of the cœca extending into the 

 posterior half of body. Genital pore only slightly behind the 

 middle of body, fairly large, transversely oval; penis sac dorsal 

 and mostly posterior to genital pore, oval, occupying about one- 

 third of the breadth of body. Right testis posterior, closely in 

 front of acetabulum or partly overlapping it, may be submedian ;. 

 left testis obliquely in front of the right; prostate glands and penis 

 glands well developed. Vasa efferentia uniting in right half of 

 body and opening into the vas deferens between ovary and 

 testis; vas deferens transverse, at same level with seminal 

 receptacle; seminal vesicle spindle-shaped, transverse, im- 

 mediately in front of vas deferens, communicating with the 

 latter in left half of body; ejaculatory duct nearly straight, antero- 

 posterior, joining the seminal vesicle at its right end, penetrating 

 the penis sac ; penis when completely retracted U-shaped, flat- 

 tened dorsoventrally, receiving the ejaculatory duct near its right 

 end, opening at the other into the genital atrium. Ovary small, 

 subglobular, in right half of body between penis sac and right testis; 

 uterine windings few and simple, in left half of body between penis 

 sac and paired yolk duct; metraterm on left side of penis sac, curv- 

 ing towards the median line and opening into the genital atrium. 



