1G8 JESSIE A, SALLITT. 



closely resemble those of Phacus. The colour of those of 

 Euglena oxyuris is a slightly deeper green. The cor- 

 puscles are from -0025 to '005 mm. in diameter in Euglena 

 acus, and from -0025 to -007 mm. in diameter in Euglena 

 oxyuris.' 



In Euglena viridis the corpuscles agree in structure with 

 the typical form ; they consist of a colourless and a green 

 part. Their shape is, however, considerably modified ; they 

 are much flattened, and are irregular in outline. They are not 

 numerous, and frequently in young forms only two or three are 

 present. Professor Lankester informs me that the Euglense 

 produced by division contain at first only one lenticular cor- 

 puscle. They lie usually close under the cuticle with their 

 green surface adhering to it, as in fig. 22, a, c. In their 

 normal position the colourless layer is only seen when the 

 corpuscles are dividing. It is best seen when the free cor- 

 puscles are viewed from the side. The corpuscles vary con- 

 siderably in size ; the longer axis is from '005 mm. to '009 mm. in 

 length, and the shorter axis about "0025 mm. The chlorophyll 

 is an intense green ; frequently in young forms a red colour is 

 also present. In many cases the chlorophyll appears diffused 

 through the endoplasm. Mr. Saville Kent considers that the 

 chlorophyll in this form is normally diffused. He says : — 

 " The brilliant green hue of the entire subcuticular parenchyma 

 affords perhaps the most pre-eminent example of such diffuse 

 colouration." ^ He regards the chlorophyll bodies as the result 

 of the splitting up of the "entire coloured inner substance" 

 previous to multiple division. I have not followed the process 

 of multiplication in the Euglena, but several things seem to 

 oppose this view. In many cases where the chlorophyll appears, 

 diffused careful examination shows more or less distinctly the 



1 The lateral compression of the body in Euglena acus and Euglena 

 oxyuris, its slight flexibility, and the total absence of the simple muscular 

 movement characteristic of the Euglenidee, as well as the form of the cor- 

 puscles, seem to show that these animals are more closely connected with the 

 Phacidse than with the group in which they are now placed. 



' W. Saville Kent, ' "Manual of Infusoria.' 



