THE TELOSPORASIDA AND THE COCCIDIA PROPER 



181 



with 1 million oocysts or less. In lambs 

 infected with 3 or 5 million oocysts, the 

 feces became soft on the 13th day and then 

 returned to normal during the next 6 days. 

 The health, general condition and weight 

 gains of these animals were not affected. 



Severe diarrhea was produced with 

 higher doses, but none of the animals 

 died altho one was killed in extremis. In 

 general, the experimentally infected lambs 

 appeared normal up to the 13th day after 

 inoculation, when their feces became soft. 

 In the more heavily infected lambs the 

 feces then became watery, and diarrhea 

 was severe beginning on the 15th day. 

 Blood-tinged mucus was passed by affected 

 lambs only occasionally. The feces began 

 to return to normal on the 17th day and 

 were usually nearly normal by the 20th 

 day. Lambs with marked diarrhea be- 

 came weak and refused feed. 



At necropsy, only a few small, 

 slightly hemorrhagic areas scattered 

 thruout the lining of the small intestine 

 were seen up to the 13th day. From the 

 13th to 19th days the small intestine was 

 more or less thickened and edematous, 

 and thick, white opaque patches made up 

 of groups of heavily parasitized villi were 

 present. 



The villi containing the schizonts be- 

 come thin-walled sacs and are presumably 

 destroyed. The sexual stages are clus- 

 tered in the epithelial cells of the villi 

 and destroy these cells when they emerge. 

 However, they do not do as much damage 

 'as the asexual stages, since the condition 

 of affected animals appears to improve 

 before oocysts are shed. 



E. arloingi is less pathogenic than 

 E. ninakohlyakimovae . 



Epidemiology : This species has 

 been reported not only from domestic 

 sheep and goats but also from the Rocky 

 Mountain bighorn sheep [Ovis canadensis), 

 moufflon (O. musimon), argali (O. animon 

 polii), ihex {Capra ibex), and Hem )nitra- 

 gus jemlaicus (see especially Yakimoff, 

 1933a). Ullrich (1930) found it in the roe 

 deer. Whether the forms from all these 

 animals are really E. arloingi remains to 



and cross-transmission experiments. 

 According to Lotze (1953), no cross-trans- 

 mission studies, even between domestic 

 sheep and goats, have been reported up un- 

 til the time of his paper, and he attempted 

 none. 



EIMERIA CRANDALLIS 

 HONESS, 1942 



Hosts : Sheep, Rocky Mountain big- 

 horn sheep. This species was originally 

 described from the bighorn sheep, but 

 Hawkins (in Morgan and Hawkins, 1952) 

 found it in domestic sheep. 



Location: Unknown. Oocysts found 

 in feces. 



Geographic Distribution : North 

 America (Wyoming, Michigan). 



Prevalence : Unknown. 



Morphology : The oocysts are spher- 

 ical to broadly ellipsoidal to ovoid, color- 

 less to faint pink or greenish, and are 17 

 to 23 by 17 to 22 jj. with a mean of 21. 9 by 

 19.4|ji. Their length-width ratio is 1.00 

 to 1. 35 with a mean of 1. 11. A micro- 

 pyle and micropylar cap are present. The 

 micropylar cap measures from a trace to 

 1 . 7 |i high and 3. 3 to 6. 6 /ji wide with a 

 mean of 0. 8jj, high and 4. 9fi wide. The 

 oocyst wall has a distinctly demarcated 

 outer edge, a feature which Honess (1942) 

 considered to distinguish this species 

 from E. arloingi. The sporocysts are 8 

 to 11 by 5 to 8 fj. with a mean of 9. 5 by 

 6. 4|i . No information is available on 

 oocyst polar granule, oocyst residuum or 

 sporocyst residuum. 



Lotze (1953) considered that this spe- 

 cies was of doubtful validity, since its 

 oocysts fall into the size range of E. 

 arloingi. but Morgan and Hawkins (1952) 

 accepted it, stating that Hawkins had found 

 that its peak of infection in Michigan oc- 

 curred at a different time from that of E. 

 arloi)igi. 



Life Cycle : Unknown. 



Pathogenesis : Unknown. 



