11 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 LabWs 

 " 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 Hyaioklossia Lieberkiihni, 

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

 sites ParacoccidiiDH prevoti recently described by Laveran 

 and Mesnil, and Coccidiicm fatiarnm Labb^. Molybdis 

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

 esculenta, is doubtfully united with Coccidiuin ranarum by 

 Minchin, who regards the Karyophagiis ranarum of Labb^ as 

 also but another form of this same species. 



The blood parasites belonging to the Hcemosporidia are 

 represented by at least two species which infest frogs. 

 Lankestrella \_£>repa7iidiuin'\ ranarum (Lank.) and an allied 

 species, Z. moni/is, occur in the red and white blood 

 corpuscles of Rana esculenta. The forms described as 

 HcEmogregarina magna and Cytarnoeba bacterifera Labb^ are 

 considered by Minchin as anomalous forms of one of the 

 species of Lankestrella. Dactylasoma \_Laz'erania'\ rana- 

 rum {= D. splcndens Labb6) is considered byHintze as but 

 one form of Lankestrella ranarum. 



Of the Myxosporidia, Leptothera Ohlmacheri and Z. ra^iee 

 occur in the uriniferous tubules of Rana temporaria and 

 R. esculenta, and Pleistophora Datiilewskyi in the muscles of 

 R. temporaria. 



Karyamoeba r^w/V 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 oi Rana pipiens, and probably of 

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



