APPENDIX D. Ixxv 



escapes in the form of an elliptical bright-green cell, thtW i" 

 diameter, resembling a Protococcus. It exhibits a round, 

 transparent cavity, devoid of chlorophyll, corresponding in 

 size and in position to the vesicular body of the Amceba, and 

 resembling, at its colourless apex, the motile gonidia of 

 Cladophora. A few days later the elliptic or roundish cell 

 lengthens, a formation of transverse septa commences, and 

 the unicellular Alga becomes an articulated one. . . . All 

 these transformations of Phytozoa into Spirilla, Vibrioiies, 

 Monads, A??icebcB, unicellular and articulated Algce may be 

 observed, not only in the detached Phytozoa, but in those 

 which remain in the interior of the sections of the antheridia. 

 In those antheridia, of which the phytozoa are not fully ripe, 

 the AmoebcB are seen to originate in the middle of the 

 internal mass of phytozoary cells : some of them make their 

 way out through the softened mass of cellular tissue ; but 

 others remain in the interior of the antheridum until their 

 development into an articulated Alga. . . . Contempora- 

 neously with AmcebcE, and often earlier, there may be seen, 

 amidst the mass of Monads, bodies very similar in form and 

 motion to the genus Bodo (social is), and which increase by 

 transverse division. They have the front end furnished with 

 a long whip-shaped antenna or cilium similar to that of 

 Euglena. At their first appearance, their motion, their 

 change of form, and their whole exterior differ so little from 

 the earliest states of Amoeba, that at this period they cannot 

 be distinguished. In these early stages they both resemble 

 Chlamydomonas destruens of Ehrenberg. . . . The above 

 forms uniformly make their appearance, and always in the 

 succession above described. It is true that other forms such 

 as Uvella, and even Leptomilce and Periconice, are sometimes 

 met with, the germs of which may have been imported by the 

 atmosphere during the observation; but these organisms, 

 which always appear singly, and after the commencement of 



