68 DAVENPORT ACADEMY OF SCIENCES. 



The nuclei were four in number, and of great size, occupying 

 the greater portion of one side of the organism. 



This relation, as illustrated by Fig. 102, PI. XIII, is probably 

 preliminary to the encystment of Amphileptus meleagris. 



lyOXOPHYLLUM Dujardin. 



Flattened, leaf-like and flexible, the anterior extremity usually 

 the narrower. Oral aperture on the left border anterior to the 

 middle of the body. Cilia fine, in longitudinal rows. Nucleus 

 differing in different species but often moniliform. Contractile 

 vesicles single or multiple. Trichocysts usually present. 



I^OXOPHYLLUM Sp. (?) 



Body ver}' elastic, central region the wider, narrowing toward 

 each extremity. Nucleus in maturity consisting of numerous 

 separate oval masses. Contractile vesicles numerous, scattered. 

 Trichocysts not evident. 



Length of body, 400 microns. (Fig. 103, PI. XIII.) 



The organism as described above resembles, in the character of 

 its nucleus, Loxophyllum meleagris Miill. The nucleus in some 

 individuals has been observed to be band-like while in other 

 specimens as many as eight disconnected oval bodies are present, 

 the latter probably representing the mature phase of the organism. 

 Crenulation of the dorsal border has, however, not been made out 

 in the Iowa species, nor has the presence of trichocysts been 

 evident. 



Found in the bacteria-laden film of water at the surface of 

 pond water infusions. 



Reproduction is by transverse fission. 



DILEPTUS Dujardin. 



Very elongate, with a narrow anterior region, neck-like and 

 flexible, at the base of which is the mouth. Nucleus moniliform. 

 Contractile vesicles numerous, in a dorsal row. Trichocysts 

 present in the neck-like region. 



D1I.EPTUS GIGAS C. & L. 



Body greatly elongate, somewhat compressed, often with a 

 pointed tail-like prolongation. Anteriorly the body is produced 

 into a long, flattened, neck-like region, very flexible and slightly 



