PARASITES OF ANIMALS. 61 
Dochmius duodenalis Leuckart. Small intestine; Italy, 
much more common in Egypt, causing very serious disease. 
ACARINA. 
Pentastoma denticulatum Rud. (Probably the young of P. 
teenioides of the dog.) In cysts on the liver, etc. ; not very 
rare. 
P. constrictum Siebold. Liver and lungs; common in Egypt. 
; PROTOZOA. 
Paramecium coli Malmstein. Colon, excreta. 
Cercomonas intestinalis Lamb]. (C. hominis Davaine). Intes- 
tine; from a cholera patient. 
Variety B. From a typhoid fever patient. 
C. urinarius Hassal. In urine. 
C. saltans Hhrenberg. 
Trichomonas vaginalis Donné. Vagina, in mucus. 
Psorosperms, (perhaps the eggs of Distoma). 
In addition to the preceding species of true parasites, 
various kinds of insect larvae have been known to live for a 
time in the human stomach and intestine, from which they 
have been discharged either by vomiting or purging. 
Among the most common larve that may thus live in the 
human body are those of the various species of meat-flies, blue- 
bottle-flies, blow-flies, or flesh-flies (see page 101), and those 
of the house-fly. Several species of the genus Homalomyia 
have also been known to occur in this way, the eggs or larve 
having been swallowed with fruit, and more especially in de- 
cayed fruit, in which they naturally live.* Such larve often 
cause considerable irritation of the intestine, and diarrhea, 
but as their life in the larval state is very short, they must 
soon pass from the intestine or perish in it. 
INTERNAL PARASITES OF THE DOG. 
CESTODES. 
Tenia echinococcus Sicbold. Intestine, many together ; larvee 
in sheep, cattle, and man; common. 
*These insects are well described by Mr. B. D. Walsh in the American En- 
tomologist, vol. II, page 137, 1870. 
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