A SPECIES OF ROUND WORM (GONGYLONEMA) FROM 
DOMESTIC SWINE IN THE UNITED STATES. 
By Epwarp A. CuapPin, 
Of the Bureau of Animal Industry, United States Department of Agriculture. 
In an examination of specimens of Gongylonema from American 
swine it was noted that there is a pronounced csere a between 
the spicule lengths of the species, which is com- = 
mon in swine in the United States, and the re- 
ported measurements of the same organs of Gon- 
gylonema pulchrum Molin, an European form 
supposed to occur in the New World. An exami- 
nation of the available material showed that, as 
yet, the true G. pulchrum Molin is not represented 
among specimens collected in this country and 
deposited in the United States National Museum. 
GONGYLONEMA RANSOMI Chapin. 
Gongylonema ransomi CHAPIN, Journ. Amer. Vet. Asso., vol. 
61, 1922, no. 1, p. 68, (Apr.) 
Gongylonema. — Cuticle transversely striated ; 
cuticular tubercles present in the anterior 1.0— 1.2 
mm. (female) or 0.6—0.9 mm. (male) of the body 
length (fig. 1), round, oval to nearly rectangular, 
arranged more or less regularly in rows. On the 
dorsal surface, between the lateral alae, there are 
four rows of tubercles, more or less evenly spaced 
one from another but somewhat concentrated near 
the dorsal line. Ventrally there are four complete 
rows of tubercles crowded toward the median line, 
with an incomplete row on either side, which is 
located between the external of the four rows 
and the lateral ala. Dorsal ala absent. Lateral 
alae short, extending a short distance beyond ae : 
the posterior limit of the tubercles, slightly un- yy¢. 1,.— Goneytonema 
equal in length. Cervical papillae situated on a = RANSOMI. ANTERIOR 
. 5 : EXTREMITY OF FEMALE 
craterlike depression upon a circular tubercle — (exsanczp). 
No. 2456—PROCEEDINGS U. S. NATIONAL MUSEUM, VOL. 62, ART. 10. 
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