I897j MICROSCOPICAL JOURNAL 143 



ticity and capaciousness of the oral aperture and pliai-ynx 

 has been often demonstrated by the eng"ul[)hin<; of parti- 

 cles of food twice the size of the infusorian. The caudal 

 seta is difficult to see excepting when the infusorian is 

 quiet. 



Family. — Prorodontida*. S. K. 



Genus. — Holophrya. Ehr. 



Species. — Holophryn [)Og-onias. (fig-. 14.) 



Budy ovate, subcylindrical, exceedingly elastic and 

 changeable in shape; twice as long as wide; posterior 

 evenly rounded, anterior transversely truncate and in- 

 cluding oval a[)erture; body entirely and finely ciliate; 

 coarsely striated longitudinally; oral and body cilia not 

 diverse; a supplementary fasicle of extra-oral cilia situa- 

 ted just below the oral aperture; these cilia much heavier 

 (not setose) and about three times longer than the body 

 cilia; projecting upwards and some distance above the 

 oral a[)erture; contractile vesicle round, conspicuous and 

 centrally located; nucleus botuliform and placed longitu- 

 dinally alongside the contractile vesicle; endoplasm gran- 

 ular, of a yellowish tint and usually containing large food 

 balls; locomotion in a wabbling manner by revolution on 

 long axis. Size 1-3 50 incli. Habitat— Brackish water from 

 Lake Pontchartrain. 



The writer has some doubts as to the |)osition of this 

 iorm and has placed it among the Prorodontidjo provisi- 

 onally. In its habits and general appearance it resembles 

 the Holophrya, but the presence of the extra-oral cilia 

 may prevent its being placed among this family. 



Family. — Colpidae. Ehr. 



Genus. — Coleps. Stien. 



Species. — Coleps striata, (fig. 15.) 



Body subovate, cylindrical, slightly elastic but persis- 

 tent in shape; less than twice aa long as wide; anterior 



