190 



SPOEOZOA. 



Dimensions. — Oocyst 36-52 )u, in diameter ; sporocysts 

 30-32 ;li by 7-5/Li. 



Remarks. — Dobell (1919) found a Coccidium in a young man 

 who had been in South Africa, India, and Ceylon, and described 

 it as a new species under the name Coccidium oxyspora. 

 He could not determine whether the organism was pathogenic, 

 as the patient was also infected with Entamoeba histolytica 

 and Ancylostoma. He further analysed records of over seventy 

 cases of coccidiosis in man. These cases all belong to Eimeria 

 clupearum (Thelohan) {=E. wenyoni Dobell, 1918) or to 

 Isospora belli Wenyon (=/. hominis Railhet & Lucet). 



Snijder (1920) described another case of human coccidiosis 

 and, as the oocysts were definitely larger, Dobell (1920) named 



Fig. 92. — -Eimeria sardine (Thelohan). (After Dobell.) 



this parasite E. snijdersi. Broughton-Alcock and Thomson 

 (1922), however, in another case of E. oxyspora infection 

 found oocysts quite as large as those of E. snijdersi, and con- 

 sidered the two species to be identical. Brug (1922 a) 

 suggested that E. snijdersi was of animal origin and ingested 

 with food. Thomson and Robertson (1926 a) made a careful 

 study of the Coccidia of fish and came to the conclusion that 

 the oocysts of E. sardine (Thelohan, 1890), parasitic in the 

 " soft roe " (testis) of herrings, sprats and mackerel, are 

 identical with the oocysts of E. oxyspora and E. snijdersi. 

 They further (1926 b) proved their contention by giving 

 a man a strong sahne aperient and afterwards making him 

 eat a large quantity of soft roe of herring. Next morning he 

 passed a large number of oocysts of E. sardinm which were 



