370 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



EUSTKONGYLIDES EXCISUS Jaegerskiold, 1909 



Synonyms. — Strongylus tubifex Rudolphi, 1819, part; Eustrongy- 

 lus papilloma Diesing, 1851, part; Hystrichis papillosus Molin, 

 1861, part; Hystrichis elegans Stossich, 1899, part. 



Fig. 429. — Eustrongylides afiucanus. a, Head end ; b, female tail; c, ex- 

 terior OF EGG ; d, riTTING OF SHELL ; e, INTERIOR OF EGG. AFTER JAEGERSKIOLD, 



1909 



Hosts. — Primary : Phalacrocorax carbo and P. pygmaeus; second- 

 ary : Unknown, probably fish ; see E. tubifex, p. 367, and E. ignotus, 

 p. 371. 



Location. — Gizzard. 



Fig. 430. — Eustrongylides excisus. a, Head; b and c, tail of male. 



Jaegerskiold, 1909 



After 



Morphology. — Eustrongylides (p. 367) : Head (fig. 430a) with 12 

 papillae, those of the inner circle longer and more slender than 

 those of the outer, the inner ones measuring 25 to 30/* long, spine- 

 like with a sharp point, the outer ones 20 to 25/* long, wart-like, 

 with broad bases. Mouth cavity moderately large, 110 to 150/* long. 



