No. 2322. TREMATODE FAMILY HETEROPHYIDAE— RANSOM. 541 



As described by Yokogawa (1913) the adult M. yokogawai in the 

 living condition measured 1 to 1.5, seldom 2.5, mm. long by 0.425 to 

 0.73 mm. wide. Oral sucker, 77 to 86.4 [x in diameter. Pharynx, 50.4 

 to 52.4 [ji. long by 45 to 52 p^ wide. Ventral sucker, 120 to 136.8 [jl long 

 by 84.8 to 108 [x wide. Ovary, 120 to 132 [x in diameter. Testes, 210 

 to 280 [X in transverse diameter. Preserved specimens measured 0.56 

 to 0.982 mm. long by 0.35 to 0.526 mm. wide. Oral sucker, 48 to 

 62.4 [JL in diameter. Pharynx, 28.8 to 36 [i, long by 24 to 35.5 [x wide. 

 Ventral sucker, 88.8 to 129.2 [x long by 55.2 to 60 [x wide. Ovary, 67.2 

 to 96 [X in diameter. Testes, 120 to 156 jx in transverse diameter. 

 The cuticular scales measured 9.6 to 10 [x long in fully developed 

 adults, and were described as nail-shaped. The eggs measured 27.5 

 to 30 [X long by 15 to 16.8 [x wide; color yellowish-brown. 



Yokogawa has found Metagonimus yokogawai occurring in the 

 adult stage in man, dog, and cat, and has reared the worms to sexual 

 maturity in dogs and mice fed with the cercariae. The usual host of 

 the cercaria in Formosa is a trout {Plecoglossus altivelis), a fish com- 

 monly eaten raw in that country, but the cercaria has also been found 

 encysted in Carassius auratus and Leuciscus hacuensis by Katsurada 

 in Japan, as well as in Plecoglossus. According to Katsurada the 

 cercaria is common in fishes in Korea, and he has observed the eggs of 

 M. yokogawai in the feces of Koreans. 



Ciurea (1915, pp. 445-458) has described Loossia romanica from 

 the dog, L. parva from the cat, and L. dohrogiensis from the pelican 

 in Roumania. The morphological differences in these three forms 

 are chiefly those of size and color of the eggs. 



Loossia romanica (figs. 8, 9) from the dog measures 0.6 to 1.56 mm. 

 long, 0.4 to 0.54 mm. wide. Cuticular scales rectangular, 9 [x long, 5 [x 

 wide, posterior free edge somewhat rounded, very minutely dentated ; 

 in anterior portion of body 3 [x apart; behind genital sinus become 

 gradually smaller and less numerous toward the posterior end of the 

 body. Oral sucker, 81 to 110 [x in diameter. Prepharynx 22 to 74 [x 

 long according to state of contraction. Pharynx, 50 to 63 {x long by 

 30 to 44 [X broad. Esophagus, 86 to 143 [x long. Bifurcation of in- 

 testine about one-third the body length from the anterior end of body. 

 Right intestinal cecum ends between the levels of the anterior and 

 posterior border of the right testis ; left cecum reaches nearly to the 

 wall of the excretory vesicle. Ventral sucker, 96 to 165 [x long and 

 96 to 114 [X wide. Testes, 149 to 224 [x long by 121 to 187 ix wide. 

 Ovary, 83 to 145 [x long by 88 to 165 \i wide. Eggs average 28 [x by 

 17 [X in diameter ; reddish brown in color. 



Loossia parva (fig. 10) from the cat measures 0.36 to 0.78 mm. long, 

 0.24 to 0.38 mm. wide. Cuticular scales relatively short and narrow, 

 separated by wide intervals, especially on ventral surface of body. 

 Oral sucker, 59 to 94 [x in diameter. Pharynx, 40 to 52 [x long, 22 to 



