206 KANSAS UNIVERSITY SCIENCE BULLETIN. 



acutely rounded than the fundus. Mouth small, often indicated only by 

 the region from which the long, delicate pseudopodia are extended. 

 Nucleus large, spherical. The closely investing covering of the body 

 prevents any great distortions, although slight changes of form some- 

 times occur. As a result of stimuli the organism withdraws its pseu- 

 dopodia and assumes a rounded or spherical form. P. no doubt repre- 

 sents a development of amoeba to such an extent that the ectoplasm has 

 become differentiated to fonri a resisting membrane. Plate XXXVI ; figs. 

 65, 66, 67. 

 Pamphagtis hyalinus. 



Animal spheroidal and feebly produced at the lower pole into a short, 

 broad neck, terminating in a circular mouth. Shell membranous, trans- 

 parent, colorless, structureless and elastic. Sarcode intimately adherent 

 to the interior of the shell, finely granular, with variable proportions of 

 oil-like molecules. Nucleus large. Pseudopods filamentous, delicate and 

 furcate. Plate XXXVI; fig. 68. 

 Nebella Leidy. 



Shell usually compressed pyriform, transparent, colorless, with or 

 without appendages, composed of cancellated membrane or of peculiar 

 intrinsic structural elements of variable form and size, mostly of circular 

 or oval disks, of narrow rectangular plates or rods, or of thin, less 

 regular, angular plates, often almost exclusively of one or the other, 

 sometimes of two or more intermingled in variable proportions. Some- 

 times of chitinoid membrane incorporated with more or less extrinsic ele- 

 ments, and sometimes of these entirely. Mouth inferior, terminal, 

 oval. Sarcode colorless, in form, constitution and arrangement as in 



Diffliigia. 



Leidy records this form as being found only in sphagnum moss or in 

 cedar swamps; therefore I hesitated about putting it in, but afterwards 

 verified my finding in some mossy material that I know came from the 

 gully on the golf links at Lawrence. 

 Nebella coUaris Leidy. 



Shell compressed pyriform, longer than broad, sides sloping down- 

 ward and generally slightly inflected toward the oval end. Mouth trans- 

 versely oval, entire. Shell colorless, variable in its structural elements, 

 generally composed of oval or circular disks, sometimes nearly exclusively 

 of one or the other, sometimes mingled with rod-like or narrow rec- 

 tangular plates and sometimes composed almost wholly of these, I'arely 

 composed of thin, irregular angular plates. Sarcode colorless. Pseu- 

 dopods digitate. In moss and scum from gully in golf links, Lawrence. 

 Plate XXXVI; fig. 69. 



BIBLIOGRAPHY. 



BuTSCHLl — Protozoa. In Bronns Klassen und Orduungen des Thier- 



reichs 1883-1888 



Calkins— The Protozoa 1901 



Conn — A Preliminai-y Report on the Protozoa of the Fresh Waters 



of Connecticut 1905 



Edmondson — The Protozoa of Iowa 1906 



Leidy — North American Rhizopods 1879 



