SPECIAL MORPHOLOGY AND TAXONOMY OF INFUSORIA 387 



drawn out into arms or processes. The macroniicleiis is almost 

 always beaded. Typical genera are: 



1. Climacostomum (Fig. 56, p. 107), with flattened body; frontal 

 field at an angle. 



2. Fabrea, body pear-shape, widest at the base; attached. 



3. Folliculina (Fig. 84, p. 160), frontal field drawn out into arms; 

 attached; tube dwelling. 



4. Stentor (Fig. 74, p. 145), body trumpet-shape when expanded. 



Fig. 171. — Tyi^es of Ciliata. A, Condylostoma patens; B, Mctopus sigmoides; 

 C, Nyctotherus cordiformis. {A, after Calkins; B, C, after Biitschli.) 



Family 3. Gyrocorycidae, Stein.— A family created for the recep- 

 tion of the single genus ('(Fiiomorpha of Perty (= (ii/roeori.s-, Stein), 

 with characteristic bell-shape body and manubrium-like tail or 

 process; a second genus Trochella of Penard has been added. 



Family 4. Bursaridse, Stein. — In this family the peristome is wide 

 and usually fleeply insunk. The representatives are either free- 

 living or parasitic; of the latter Balantidiopsis is laterally com- 

 pressed and the peristome inconspicuous, while in Balantidium the 

 body is oval or ellipsoidal, and the peristome only slightly insunk. 

 Of the free-living forms Ihirsaria has a peristome so deeply insunk 



