in the anterior region; reserve food in the form of 2 large, lateral 

 paramylon rings, the 2 together sometimes nearly encircling the cell. 



Species of this genus are usually found in company with other 

 euglenoids. They are, for the most part, not found in euplankton 

 but occur among dense growth of algae in shallow bays, swamps, 

 and in ponds. They nearly always appear in samples from water 

 which is rich in organic acids and nitrogenous substances. 



The nature of the periplast decoration is of taxonomic value 

 because it varies according to species. This character is often ob- 

 scured by the density of cell contents, and it is necessary to manipu- 

 late a specimen so that it can be seen from various angles. 



Key to the Species 



1. Cells narrowly pyriform or narrowly ovoid, 



gradually tapering posteriorly L. acuta 



1. Cells broadly ovoid, or broadly ellipsoid, 



without a long caudus 2 



2. Cells ovoid, S9-58fi long, with a short caudus L. fusiformis var. major 



2. Cells subglobose, ovoid, or fusiform; smaller 3 



3. Cells with a bipapillate protrusion at the anterior 



end from which the flagellum emerges 4 



3. Cells without a bipapillate protrusion - 5 



4. Cells broadly ovoid, 19-21/i in diameter L. glabra 



4. Cells ellipsoid, or narrowly ovoid, 8-10/n in diameter L. sphagnophila 



5. Cells 15-17ac in diameter L. fusiformis 



5. Cells larger, 22-30/x in diameter 6 



6. Cells 22-25;U in diameter; flagellum emerging 



at the anterior end L. ovum 



6. Cells 28-30^1 in diameter; flagellum arising 



subapically to nearly laterally L. Playfairiana 



Lepocinclis acuta Prescott in Prescott, Silva, & Wade 1949, p. 89 



PI. 89, Figs. 8,9 



Cells ovoid-pyriform, tapering posteriorly to a long, sharply point- 

 ed caudus, slightly narrowed anteriorly and rounded at the apex; 

 periplast spirally striated downward to the right; flagellum about 

 as long as the body; paramylon in the form of 2 curved plates, 1 

 on either side of the cell; chloroplasts several ovoid discs; cells 

 11-13/x in diameter, 30-34/a long. 



Conrad in his ' monograph (1934) does not record any species 

 which combine the characteristics of our specimens. The size of the 

 cell and the long, tapering caudus are distinctive. 



Among other algae in a fosse. Wis. 



[ 405 1 



