ENTAM(EB.E OF BIRDS AND AMPHIBIA 231 



faeces by Walker (1908), and named by him Amoeba intestinalis, is not a 

 parasitic form at all, but a coprozoic organism. 



Nieschiilz (19"23f/, 19246) found that pigs harbour two species of Enta- 

 mwba. There is the large form referred to above, and a smaller one not 

 more than 5 to 9 microns in diameter, which he proposes to name E. de- 

 bliecki. Uninucleate cysts with chromatoid bodies are described (Fig. 106.) 



Liebetanz (1905) described E. bovis from the stomach of cattle. It 

 was redescribed by him (1910) and by Braune (1913), and was said to 

 be 20 microns in diameter. Nieschulz (19226) has met with a smaller, 

 though possibly the same form in cattle in Germany. The amoebae, 

 which varied from 5 to 10 microns in diameter, had nuclei of the entamoeba 

 type. He also saw uninucleated cysts 5 to 12 microns in diameter in the 

 faeces. He was unable to determine with certainty that these cysts were 

 derived from the amoebae in the rumen. 



Fantham (1920, 1921) refers to an amoeba called by him E. intes- 

 tinalis {Amoeba intestinalis Gedoelst, 1911), which occurs in the 

 colon and caecum of horses in South Africa. No details of the structure 

 are given. He states (1921) that in the faeces he has seen another 

 form which he names E. equi. It may contain red blood-corpuscles, and 

 when round has a diameter of 28 to 35 microns. Four- nucleated cysts 

 containing chromatoid bodies and measuring 15 to 20 microns in diameter 

 are also mentioned. It is assumed that it is a pathogenic species. 



Swellengrebel (1914) discovered free amoebae and uninucleated cysts 

 in the intestine of sheep, and proposed the name E. avis. The writer 

 has seen eight-nucleated cysts of the E. coli type in goats' faeces. Fantham 

 (1923) gave the name E. cajprce to an amoeba of the goat. Very little is 

 known about these forms. Nieschulz (19236) has found in goats an amoeba 

 which appears to be identical with the small £^. debliecki of pigs. 



Fantham (19106) described as E. lagopodis an amoeba found by him 

 in the intestine of the grouse, Lagopus scoticus. Cysts with four nuclei 

 were noted. According to Hartmann (1913), Kuczynski saw a similar 

 form in fowls, but the encysted stages had eight nuclei. Tyzzer (1920) 

 saw the same amoeba in American fowls. He noted tha^t in the free 

 and encysted stages it closely resembled E. coli. To a form in the duck 

 in S. Africa Fantham (1924) gave the name E. anatis. Cysts with one 

 or four nuclei are described. 



Frogs harbour amoebae (E. ranarum Grassi, 1879) which Dobell has 

 shown to resemble E. histolytica very closely in the free and encysted 

 stages (Fig. 107). So similar were these forms that Dobell (1918) 

 attempted to infect tadpoles by causing them to ingest cysts of E. histo- 

 lytica. The cysts showed no signs of hatching in the intestines of the 

 tadpoles, and were passed unaltered in the faeces. E. ranarum was 



