I08 DAVENPORT ACADEMY OF SCIENCES. 



Length of body, 60 microns. (Fig. 191, PI. XXVI.) 

 Found in pond water, solitary in its habits. 



VORTICELLA TELESCOPA S. K. 



Body conical, elongate, tapering posteriorly. Two annular 

 grooves in the posterior region, behind each of which the body 

 abruptly narrows. On contraction the narrow regions are tele- 

 scoped into the wider anterior regions. Surface smooth. 



Stalk not much longer than the body. 



Length of body, 40-50 microns. (Fig. 185, PI. XXV.) 



Found in Washington county, in pond water. Solitary in its 

 habits. 



VORTICELLA CITRINA Ehr. 



Body campanulate, anterior border greatly dilated, surface 

 smooth. Endoplasm pale yellow in color. Stalk slender, three 

 or four times the length of the body. 



Length of body, 60 microns. (Fig. 187, PI. XXVL) 



Found in great social groups in fresh water. 



VORTICELLA QUADRANGULARIS (?) S. K. 



Figure 188, Plate XXVI, illustrates the largest species of Vorti- 

 cella that has been observed in this state. Body greatly elongated, 

 fully three times as long as broad, angular in contour, anterior 

 margin slightly dilated. Pharynx very large and conspicuous. 

 Surface transversely striate. Stalk thick and short, about twice 

 the length of the body. 



Length of body, 200 microns. 



The form illustrated is classified here with some doubt as to its 

 true identity. The organism was found in fresh water. Solitary 

 in its habits. 



VORTICELLA Sp. 



Figure 192, Plate XXVI, represents a species rarely found in 

 this state. Body somewhat spherical when extended. Anterior 

 border dilated to a considerable degree. Surface striate trans- 

 versely. Stalk slender, three or four times as long as the body. 



Length of body, 50 microns. 



Habitat, fresh water, in small social groups. 



