N. H. SWBLLENGREBEL 
363 
REFERENCES. 
Auerbach (1910). Die Cnidosporidien. Leipzig, W. Klinkhardt. 
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Minchin (1903). “ Sporozoa,” in Ray Lankester’s Treatise on Zoology, Part I, 
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DESCRIPTION OF PLATES XVII AND XVIII. 
PLATE XVII. 
Fig. 1. Living specimen of Crenilahrns melops with tumour caused by Pleistophora 
gigantea. 
Fig. 2. Trophozoites of P. gigantea surrounded by connective tissue. (Zeiss oil 
immersion 2 mm. ocul. 2.) 
Fig. 3. Portion of a large cyst of P. gigantea, containing sporoblasts. (Zeiss oil 
immersion 2 mm. ocul. 4.) 
PLATE XVIII. 
Fig. 1. Cysts of P. gigantea. a. Group of trophozoites between the cysts. Zeiss obj. 3 
ocul. 2. 
Fig. 2. Large cyst of P. gigantea surrounded by smaller cysts. (Magnification of fig. 1.) 
Fig. 3. Large cyst of P. gigantea. (Magnification of fig. 1.) 
Fig. 4. Diffuse infiltration of spores of P. gigantea. (Magnification of fig. 1.) 
Fig. 5. Cysts of P. gigantea. a. Capsules of connective tissue surrounding trophozoites. 
(Magnification of fig. 1.) 
Fig. 6. Trophozoites tightly encapsuled by connective tissue. (Zeiss oil immersion 2 mm. 
ocul. 4.) 
