9 
power and later under a higher power diy lens. It will not always he 
possible to determine from the microscopic examination alone w^hether 
the infection is hepatic or intestinal, as the size of the eggs varies and 
the exact species can not ahvays be definitely determined from the egg. 
KEY TO THE EGGS OF TREMATODES REPORTED FOR MAX. 
(For species thus far found in the United States, follow Roman type.) 
1. Eggs in sputum ; embryo not developed. Parasitic hemoptysis... 2 
Eggs in feces; embryo developed or undeveloped 3 
Eggs in urine; 120 fi long by 50 // broad; provided with a 20 long terminal 
or subterminal sj)ine; contain no embryo when first oviposited, but 
embryo may develop before egg is discharged from the host. Bilhar- 
ziosis (Egyptian hematuria) Schistosoma hcematohium (p. 50) 
2. Egg 68 to 118/f long by 48 to 60/4 broad. This is the egg usually found in 
parasitic hemoptysis Paragonimus ivestermanii (p. 16) 
Egg 150 to 190 ju. long by 75 to 90 broad. Very rare in man 
Fasciola gigantica (p. 19) 
EGGS IN FECES. 
3. The same egg also in the sputum 1 
The same egg may also be in the urine 1 
The same egg neither in the sputum nor in the urine 4 
4. Egg more than 100 ju long 5 
Egg less than 50 ju long. 6 
5. Egg 130 to 145/4 long by 70 to 90/4 broad; does not contain embryo when 
discharged in feces. Indicates infection of the liyer .. Fasciola hepatica (p. 22) 
Fgg 120 to 130 /4 long by 77 p broad; does not contain embryo when discharged 
in the feces. Indicates infection of the intestine Fasciolopsis buskii (p. 41) 
Fgg 150 /4 long by 80 p broad. Indicates inf ection of the intestine 
Fasciolopsis rathouisi (p. 42) 
Egg 150 p long by 72 p broad. Indicates inf ection of the intestine - 
Gastrodiscus hominis (p. 46) 
6. Egg contains embryo 7 
Xot stated whether egg contcdns embryo; egg 34 P long by 19 to 21 p broad. In- 
dicates infection of the liver Opisthorchis noverca (p. 33) 
7. Embryo with two dark spots in posterior half; egg dark, 38 to 45 p long by 22 
to 30 p broad. Indicates infection of the liver Dicrocoelium lanceatum (p. 29) 
Embryo without said spots 8 
8. Egg 26 to 30 u long by 11 to 15 p broad. Indicates infection of the liver 
Opisthorchis felineus (p. 31) 
Egg 28 to 30 p long by 16 to 17 p bi'oad. Indicates infection of the liver . . 
Opisthorchis sinensis (p. 35) 
Fgg 20 to 30 p long by 15 to 17 p broad. Indicates infection of the intestine 
Ileterophyes heterophyes (p. 45) 
THE PARASITES OF DISTOMATOSIS. 
Except ill cases of intestinal distomatosis and occasional!}^ in hepatic 
infection, the physician will rarely, if ever, see the parasite during the 
life of his patient. If trematodes are found on autopsy, they may be 
determined by use of the key given on p. 11. 
