406 



ZOOLOGY. 



the surface. In Euglena viridis and many other species 

 these spiral markings are very fine and close together, 

 but in some cases, as in Euglena spirogyra (fig. 204), are 



Fig. 203. EUOI.ENA VIRIDIS. 



A, usual form with central pyrenoid and radiating elongated chloroplasts. The 

 pyrenoid surrounded with small grains of paramylum. 7?, specimen with more 

 numerous paramylum bodies. C, specimen with separate chlorophyll rods. D, 

 specimen treated with alcohol and acid fuchsin to show nucleus. E, specimen with 

 cnloroplast in form of a single bifurcated band. F, specimen in spherical motionless 

 condition preparing to divide, (f, specimen with pyrenoid dividing. IT, specimen 

 with nucleus dividing, /, division completed. K, L, encysted forms showing 

 division, but not the internal details. 



much coarser and far apart. In the species mentioned 

 they are not uniform lines, but are marked with series of 

 rounded nodules. 



