yo DAVENPORT ACADEMY OF vSCIENCES. 



Contractile vesicle single, posterior. Trichocysts along the ven- 

 tral surface of the neck. 



Length of body, no microns. (Fig. 107, PI. XIV.) 

 Found in great numbers in the surface film of pond water in- 

 fusions among bacteria. Reproduction may often be seen to take 

 place by transverse fission. 



LlONOTUS PLEUROSIGMA StokeS. 



Body elongated, wider centrally, with a long neck-like region, 

 slightl}' curved, the short caudal projection often acutely pointed 

 and curved in the opposite direction. 



Oral aperture a short distance from the anterior end. Nuclei 

 two in number, centrally located and usually connected. Con- 

 tractile vesicles numerous, arranged along the ventral and dorsal 

 borders. 



Ivcngth, 80-100 microns. (Fig. 108, PI. XIV.) 



Found associated with the last described species in infusions of 

 pond water, among bacteria. Reproduction is by transverse fis- 

 sion. Conjugation may often be observed, the anterior half of the 

 ventral borders becoming temporarily united. 



LOXODES Ehrenberg. 



Elongated, flattened, anterior extremity presenting a hook-like 

 appearance. Ventral surface with fine cilia arranged in longi- 

 tudinal rows, dorsal surface slightly convex with no cilia. The 

 margin of the body with a series of strong cilia. Peristome an 

 elongate furrow in the ventral border of the anterior extremity 

 ending posteriorly in the mouth, which opens into a more or less 

 distinct pharynx. 



LOXODES ROSTRUM Ehr. 



Body persistent in shape but very flexible, posterior extremity 

 bluntly rounded or acutely pointed and bent to the left, as the 

 anterior end. Oral furrow followed by an indurated tube-like 

 pharynx. Nuclei more than one. Contractile vesicles incon- 

 spicuous. 



Length, 250-400 microns. (Fig. 109, PI. XIV.) 

 The body of this species is usually highly vesicular, but the 

 number and disposition of the contractile vesicles has not yet been 

 made out. 



