82 



THE ANIMAL PARASITES OF MAN 



Coccidium bigeminum appears to occur also in man, at all 

 events Virchow published a case which was communicated to him 

 by Kjellberg, and attributes the disturbance to this parasite (Arch, 

 f. path. An., 1860, xviii., p. 523). Possibly also it would be more 

 correct to ascribe the observation of Railliet and Lucet, which 

 is mentioned under Coccidium hominis, to this species, as the 

 coccidia in that case were distinguished by their diminutive size 

 (length 0*015 mm., breadth o-oio mm.). The case communicated 

 by Grunow may also probably refer to Cocc. bigeminum (Grunow, 

 " Ein Fall von Protozoen [CoccidienP] Erkrankung des Darmes " 

 [Arch /. exper. Path, und Pharm., 1901, xlv., p. 262]). 



FIG. 34. Cocci dium bigeminum, Stiles (from the intestine of a dog), (a) Piece of 

 an intestinal villus beset with coccidia, slightly enlarged ; (b) Cocc. bigeminum (0*015 

 mm. in diameter), shortly before division ; (3) divided ; (d) each portion encysted ; 

 (e) four spores in each part, on the left seen in optical section, and a residual body 

 strongly magnified. (After Stiles.) 



DOUBTFUL SPECIES. 



There are numerous reports in literature on the occurrence of coccidia- 

 like organisms in man, which are, however, open to considerable doubt. It 

 may prove useful to mention here a few such doubtful forms. 



(i) Eimeria hominis, R. Blanch., 1895. This is the designation applied 

 to foreign bodies found in Bordeaux by J. Kiinstler and A. Pitres in the 

 purulent pleural exudation of a man removed by tapping, The patient, 

 who had been employed on a ship plying between Bordeaux and Senegal, 

 felt a sensation of pressure on the left side of the thorax, and suffered 

 from a dry cough and dyspnoea : there were neither night-sweats nor fever. 

 The foreign bodies consisted of nucleated fusiform organisms of varying size 

 (o'OiS O'O2O O'o6o O'loo in length) and large round or oval cysts, which 

 either contained the above-mentioned little bodies exclusively, or exhibited, 

 in addition, an irregular residual body with numerous nuclei. Further observa- 

 tions could not be made. Blanchard regards the fusiform bodies as merozoites 

 and the cysts as schizonts of a coccidium ; whereas Moniez is of opinion that 



