374 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Male 19 to 30 mm. long by 1 to 2 mm. wide. Bursal cup (fig. 

 435) trumpet-shaped, cloacal aperture at bottom of bursal hollow; 

 the bursal margin is fringed or papillate. Spicule long and slender. 



Female 29 mm. long by 2.6 mm. wide, Eggs 68/x long by 38^ wide, 

 with 2 shells, the outer with pitted markings, and with opercula at 

 the ends. 



This species is not well described, according to Jaegerskiold. The 

 above description is from Linstow. 



Life history. — Unknown; probably involves intermediate stages 

 in fish. See E. tubifex, p. 367. 



Distribution. — Europe. 



FIG. 434. EUSTRONGYLIDES MEEGORUM. a, HEAD END ; I), FEMALE TAIL ; AND d, 



MALE TAIL. AFTER JAEGERSKIOLD, 1909 



EUSTRONGYLIDES PERPAPILLATUS Jaegerskiold, 1909 



Synonyms. — Eustrongylus papillosus (Rudolphi, 1802) Diesing, 

 1851, part; Hystrichis papillosus (Rudolphi, 1802) Molin, 1861, part. 



Hosts. — Primary: Ardea leuca and Herodias egretta; secondary: 

 Unknown, probably fish. See E. tubifex, p. 367. 



Location. — Not given. 



Morphology. — Eustrong glides (p. 367) : A total of 18 cephalic 

 papillae (fig. 436 a and b) instead of the usual 12; of these, 6 form 

 an inner circle and 12 an outer. Those of the inner circle are small 

 round knobs with a small point ; of the outer circle 6 are larger than 

 the others, the small alternating with the large. Mouth opening 

 triangular. Mouth cavity 96 to 150/a long. 



Male 47 mm. long by 1 mm. wide ; maximum width about 1 mm., 

 width at head end 175 to 200/*,, at posterior end (just anterior to 



