Ofi 



^/^5 



other 



•^ and fi, ■* *" U. 



Ure 



acco 



iiiii 



'' ^nd widely, 

 ^r sunlight 



^'^^''' and their r 



numerous ^'""' 

 •^rtions of the 

 e one in a t 



i^'armin? i 



1^ 



same 



t they mi»ht be 



11 



I 



nation possible in am 



f 



* on the developmeol oi 

 he most startEn? 



jes, which he had 



■ Thus K see tk 



s modes o 



mous 



forms of fc 



ing stationary m 

 sidonary stages. 



K 



^.ponds to the 

 , the border ^ 



ig. /°)! 



/ 



APPENDIX D. 



Ixxxiii 



; Zoospore ^ 



. and tlie 

 is the 



13 U'>' D 



la, 



rese 



mbliDg 



also 



(I 



idp 



erhaps 



I 



i 



ito 



1\V0 



r 



^// 





J 



r//'/« 



; 



A 



in 



« 



got^* 



an 



d Pi!'^ 



midiatus. In the quadripartite Zoospores, with the secondary 

 cells arranged in one plane, we have a Gonium (Fig. 37). 



* 



That with eight segments (Fig. 38) corresponds to Pandor- 



hat with sixteen to Botryocystis Volvox 

 the Zoospore is divided into thirty-two 



ma 



Morum 



When 



(Fig. 44)- 



segments, it is a Uvella or Syncrypta (Fig. 40). When 



this form enters the '^stilF' stage, it may be regarded as a 



form analogous to Microhalola protogenita ; this Algal genus 



is probably, speaking generally, only the product of the 



Eup-lencE or other srreen forms 



The 



naked Zoospores (Fig. 32), finally, would represent the form 

 of a Monad^ or of an Astasia ; the caudate variety ap- 

 proaches that of a Bodo, ... A critical and comparative 

 consideration of the foregoing facts would therefore appear 

 to render untenable almost all the principles which modern 

 systematists have hitherto adopted as the basis for the 

 construction of their Natural Kingdoms, Families, Genera, 

 and Species.' 



According to Itzigsohn \ Phytozoa intervene as stages in 

 the developmental history of the Os dilator im. The trans- 

 formations recorded in these observations are of a most re- 



eously arranged as 1 1 markable character. The filaments of Oscillator ia tenuis are 



said to break up into distinct fragments which soon assume 



r 



a spherical shape. These bodies (gonidia) gradually increase 

 in size, become motile, and present in all respects the aspect 

 of individuals belonging to the genus Chlamydomonas, After 

 these have attained a certain size, a red eye-point becomes 

 visible in them, and after passing through a great many inter- 

 mediate forms they develop into perfect Euglence. These in 

 their turn become encysted, and subsequently by a minute 

 self-division of their contents they are resolved into motile 

 microgonidia' which are soon liberated, and then swim about 



1 ( 



Journ. of Microsc. Science,' 1854, p. 189. 



/2 



r 



