II HABITS AND NATURAL HISTORY OF THE FROG 43 



them will prove identical with species found in Europe. 

 Descriptions of most of these forms may be found in Labb^'s 

 " Sporozoa," and in the excellent chapter on the Sporozoa by 

 Minchin in Lankester's " Treatise on Zoology," from which 

 the following list of species has mainly been compiled. The 

 order Coccidiidea is represented hy Hyaloklossia Lieberkuhni, 

 found in the envelope of the kidney, and the intestinal para- 

 sites Paracoccidiiim prevoti recently described by Laveran 

 and Mesnil, and Coccidium ranarum Labbe. Molybdis 

 Eiitzi, which occurs, like the two preceding species, in Rana 

 escidenta, is doubtfully united with Coccidium ranarum by 

 Minchin, who regards the Karyophagus ranarum of Labb^ as 

 also but another form of this same species. 



The blood parasites belonging to the Haemosporidia are 

 represented by at least two species which infest frogs. 

 Lankestrella \_Drepanidiu77i'] ranarum (Lank.) and an allied 

 species, Z. monilis^ occur in the red and white blood 

 corpuscles of Rana esculenta. The forms described as 

 Hcetnogregarina magna and Cytamodba bacterifera Labbe are 

 considered by Minchin as anomalous forms of one of the 

 species of Lankestrella. Dactylosoma \_Laverania'] rana- 

 rum {= D. splendens Labbe) is considered by Hintze as but 

 one form of Lankestrella ranarum. 



Of the Myxosporidia, Leptothera Ohlmacheri and Z. ranee. 

 occur in the uriniferous tubules of Rana tejnporaria and 

 R. esculenta, and Pleistophoi-a Danilewskyi in the muscles of 

 ' R. temporaria. 



Karya?nceba 7'enis Giglio Tos, which is stated to occur in 

 the renal epithelium of both the frog and the mouse, is a 

 sporozoan of uncertain systematic position. 



Of plant parasites, there is a species of Saprolegnia which 

 sometimes attacks the skin of Rana pipiens, and probably of 

 other species of frogs. It forms large, light-colored blotches 



