EU CI LI AT A, HOLOTRICHIDA 361 



two undulating membranes. Ciliation and striation uniform. 

 Macronucleus central and spherical. A single micronucleus. 



Glaucoma scintillans Ehrenberg (Fig. 154, h). Body 90 to 

 100 microns long. Pond water and infusion. 



Glaucoma pyriformis MacArthur (Fig. 154, i). In the body 

 cavity of larvae of the mosquito, Theohaldia annulata. 



Genus Colpoda Miiller. Body kidney-shaped, laterally com- 

 pressed; aboral surface hemi-circular, oral surface somewhat 

 flattened. Cytostome some distance from the anterior end. 

 Long cilia around the opening. Contractile vacuole often ter- 

 minal. Macronucleus central and rounded. Fresh water. 

 Common in infusion. 



Colpoda helia (Stokes) (Fig. 155, a). Body about 85 to 95 

 microns long. In standing water with algae. 



Colpoda campyla (Stokes) (Fig. 155, b). Body about 50 to 

 60 microns long. In standing water with dead leaves. 



Colpoda cucullus Miiller (Fig. 155, c). Body about 90 

 microns long. In infusion. 



Colpoda inflata (Stokes) (Fig. 155, d). Body about 40 to 50 

 microns long. In standing water. 



Genus Colpidium Stein. Similar to Colpoda. Body oval to 

 reniform, elongated, but not so compressed. Peristome shallow, 

 nearer the anterior end, with an undulating membrane. Cyto- 

 stome roughly triangular. Cytopharynx short. Macronucleus 

 central and spherical. A single micronucleus. One contractile 

 vacuole in the posterior half. Fresh or salt water. Very com- 

 mon in infusion. 



Colpidium striatum Stokes (Fig. 155, e). Length about 50 

 microns. In infusion of decaying vegetation. * 



Colpidium colpoda Ehrenberg (Fig. 155,/). The figure shows 

 a marine form, 45 microns long by 20 microns wide. Fresh or 

 salt water. 



Genus Lambornella Keilin. Body oval; dense ciliation; 

 small cytostome fusiform near the anterior end (?). A spherical 

 macronucleus and a micronucleus. Cysts hemi-spherical. Para- 

 sitic. One species. 



Lambornella stegomyiae Keilin (Fig. 155, g, h). In the coelom 

 of Stegomyia scutellaris. Body about 50 to 70 microns long. 



