Il6 DAVENPORT ACADEMY OF SCIENCES. 



of capitate tentacles. Posteriorly the body gradually tapers 

 toward the point of attachment to the pedicle. The pedicle is 

 slightly expanded at the point of union with the body. Nucleus 

 elongate or oval. Contractile vesicles usually more than one. 



Length of body, 100-200 microns. (Figs. 21 1-2 13, PL XXIX.) 



This species has been found abundantly, attached to Epistylis 

 plicatilis, which has been obtained from the under side of stones 

 in small running streams. Podophrya qiiadripartita may also be 

 found attached to other species of Epistylis. The pedicle is four 

 or five times the length of the body and in appearance closely 

 resembles a branch of the host which serves as its support. With 

 the body of the Suctorian extending slightly beyond the border 

 of the zooids of the Epistylis, it can readily be seen that some 

 minute organisms, drawn by the powerful currents produced by 

 the zooids of the Vorticellan, may find lodgment against the suck- 

 ers of Podophrya. 



Figure 211 illustrates a typical normal individual. Fig. 212 

 represents a branch of Epistylis with several individuals of this 

 species attached. 



Reproduction takes place by the development and liberation of 

 internal embryos. Fig. 213 is reproduced from an individual 

 killed with osmic acid and stained with carmine, showing what is 

 probably an internal embryo previous to its extrusion. 



Family, ACINETID^. 



ACINETA Ehrenberg. 



Body inhabiting a lorica which is produced posteriorly into a 

 rigid stalk. Tentacles capitate, in groups or scattered. 



Two species have been observed in this state, neither of which 

 I have been able to identify. 



ACINETA sp. 



Lorica spherical, produced anteriorly into a short, thick stalk. 

 Body spherical, almost completely filling the lorica. Tentacles 

 in two antero-lateral groups. Nucleus spherical, central. Con- 

 tractile vesicle single, lateral. 



Height of the lorica, 78 microns. Fig. 214, PI. XXIX.) 

 Found in fresh water in Johnson county. Stalk shorter than 

 the diameter of the body. 



