EUCILIATA, HOLOTRICHIDA 347 



Coleps octospinus Noland (Fig. 148, h). Body large, 100 to 

 110 microns long. With eight posterior spines. All fresh water. 



Genus Tiarina Bergh. Somewhat similar to Coleps, but the 

 posterior end pointed. Marine. Rare. 



Genus Plagiopogon Stein. Similar to Coleps, but with 

 rounded posterior end. Fresh or salt water. 



Plagiopogon coleps Stein (Fig. 148, i). Body about 80 

 microns long. 



Genus Metacystis Cohn. Body oblong, symmetrical, defi- 

 nite; the entire surface ciliated, except the posterior end. Ciliary 

 circle around the cytostome. 



Metacystis truncata Cohn (Fig. 148, j). About 40 microns 

 long. Among decaying marine algae. 



Genus Trachelocerca Ehrenberg. Body highly extensible, 

 flask-shaped ; the anterior portion forms a long flexible neck- 

 like process. The cytostome is often quadrangular in form. 

 Numerous contractile vacuoles irregularly situated. 



Trachelocerca phoenicopterus Cohn (Fig. 149, a). In salt 

 water. Body extended measures 1.7 mm, in length. 



Genus Trachelophyllum Claparede and Lachmann. Elon- 

 gated, ribbon-like, flexible. Peristomal ciliary ring is well de- 

 veloped. A knob oh the end of a neck-like proboscis. Contrac- 

 tile vacuole at the posterior end. Numerous micronuclei. Fresh 

 or salt water, 



Trachelophyllum clavatum Stokes (Fig, 149, b). Length about 

 180 microns. In fresh water. 



Genus Lacrymaria Ehrenberg. Body flask-shaped but 

 changeable, with a comparatively long contractile proboscis. 

 Posterior end is rounded. Cytostome round. There is a neck- 

 like constriction with a circle of longer cilia around the cyto- 

 stome. Cytopharynx. Fresh or salt water. 



Lacrymaria olor Miiller (Fig. 149, c, d). Highly contractile. 

 When extended the body measures 400 microns in length. 

 Fresh water, 



Lacrymaria lagenula Claparede and Lachmann (Fig, 149, 

 e,f). Length 90 to 160 microns. Marine. 



Lacrymaria coronata Claparede and Lachmann (Fig, 149, g). 

 Length 85 microns. Marine, 



Genus Chaenia Quennerstedt. Elongated body highly con- 



