'290 DESCRIPTION OF \Potygastrica, 



pressed between glasses, the little shields composing it are 

 rendered visible. Found amongst conferva. They are 

 rather scarce. Length l-570th to 1 -430th. 



460. COLEPS viridis. The green Coleps. Body oval 

 and ciliated, lorica composed of plates terminating in three 

 points. Found amongst conferva. Size l-960th to l-570th. 



461. COLEPS elongatus. The long Coleps has a cylin- 

 drical elongated body, lorica tabulated, white, and termi- 

 nating in three points; transverse self-division has been 

 observed. Size 1- 570th to 1 -430th. 



462. COLEPS amphacanthm. The crowned Coleps has 

 an ovate body; lorica is composed of rings, and the ante- 

 rior part crowned with unequal teeth, the posterior having 

 three strong spines. Found in the body of Spirostomum 

 vireus. Size 1 -280th. 



463. COLEPS incurvus. The curved Coleps. Body ob- 

 long, nearly cylindrical, and slightly curved; lorica tabu- 

 lated and terminating in five points. Found amongst con- 

 ferva. Size l-430th. 



