The common stomach worm, Haemonchus contortus (Fig. 35), 75 to 95 
long by 40 to 50 wide; H. similis, reported from the United States by 
Dikmans, 70 to 78 long by 35 to 42 wide; Ostertagia ostertagi, 65 to 80 
long by 30 to 40 wide; O. circumcincta, 75 to 100 long by 35 to 50 wide; 
O. trifurcata, 85 to 95 long by 40 to 48 wide; O. marshalli, 160 to 200 
long by 75 to 100 wide; O. bullosa, 85 long by 65 wide; Cooperia 
punctata, 65 to 72 long by 30 wide; C. oncophora, 60 to 80 long by 30 
wide; C. pectinata, 70 to 80 long by 36 wide; C. curticei, 63 to 70 
long by 30 to 32 wide; Nematodirus filicollis, 130 to 200 long by 70 to 
95 wide; N. spathiger, 150 to 220 long by 80 to 110 wide; N. abnormalis, 
160 to 230 long by 85 to 115 wide; Trichostrongylus extenuatus, 70 to 
80 long by 35 to 45 wide; T. colubriformis, 73 to 80 long by 40 to 43 
Fig. 37. Capillaria brevipes. Egg. Enlarged. From Ransom, 1911. 
wide; T. probolurus, 76 to 80 long by 43 to 46 wide; T. vitrinus, 84 to 
90 long by 46 to 50 wide; T. capricola, 75 to 95 long by 35 to 45 wide. 
The Y-worm of cattle and carabao, Syngamus laryngeus, a relative 
of the gapeworm of poultry, has been reported from the Philippines 
by Hall and has recently been reported by Ransom and by Bague 
from Porto Rico. The eggs of this worm are 80 microns long by 
40 microns wide. 
The eggs of the common whipworm of ruminants, Trichuris ovis 
(Fig. 36), are lemon-shaped and 70 to 80 microns long by 30 to 35 
microns wide. Those of the hair-worms, belonging to the genus 
Capillaria, are also lemon-shaped, the dimensions for the various 
40 
