\ 



^ould C ^'^"^ 



'^b 



^catn 



'U\ 



\ 



h r/.^ • ? ^^^ ^L 



^'kh 



th 



e 



•«!| 



!> 



APPENDIX D. 



Ixxxix 



while 



\ 



^^t for ev^. -5^' 



' °° to fte J * 



'0' 



O 



deviation fo^ 

 ''■bich has also 

 ^s a rule the 

 ion of about 

 These; Dr. Hicks 

 to further sub- 

 '^^ed cellSj \vhich 



ate zoospores 

 ?Tnbrane-or, in 



')*! 



% 



retain their 

 •ed from each c 



.d 1 found^hattk^^f 



. Ull the n^asse 

 ^rvin-nioreof''- 



as a»y i»"; f 



three or four segments — the division being cruciate 



others extended themselves in a linear series, with their 



short diameters in a line. . . . Some of the divisions, instead 



i 



of sub-dividing, increased in size, producing a green cell 



much larger than the rest ' The mucus which formed 



around these cells was at first more or less definite in boun- 

 dary, but after segmentation had advanced to some degree 

 its outline was irregular, and at last quite indefinite. The 

 outer edge never possessed more solidity than the mucous 

 envelope 



of Cladonia gleocapsa! 



Dr. Hicks has seen this 



condition commence within the parent Volvox. He points 

 out its resemblance to that which occurs occasionally during 

 the growth of Pandorina and SiephanosphcEra, and he 

 adds: — 'There is also a striking analogy between these and 

 the segmenting gonidia of Hchens, especially of Cladonia! 



Other additional modes of reproduction in Volvox are 

 described in Pritchard's ' Infusoria.' 



J 



Etigli 



Amoeba. He 



:hen, ofthesuyiviii has seen the actual transition of AstasicB into Amcebce, and 

 towards the exterior of I says^: — * Young Astasice are developed within the cells of 

 I- jre produced, *i f Spirogyra to a great extent; and although they at first have 



, . .j.m I almost as much polymorphism as an Amoeba, still they retain 



their cilium, and after a while assume the form and movements 

 peculiar to Astasia, I might here mention that on one occasion 

 I saw a large Amoeba with a long cilium, at one time assum- 

 ing the form of Astasia, and at another that oi Aviccba, which 

 thus gives us the link between these two Infusorial The 



^ 'Ann. of Nat. Hist.,' 1856, vol. xvii. p. 115. 

 I have observed this modification very frequently, "Whenever the 

 j~^t(\ua is hemmed in by opposing particles or fragments, it insinuates 

 itself between them and moves generally after the fashion of an Amoeba; 

 tut, as soon as it has freed itself from the obstacles, it resumes its 

 "lore active mode of locomotion. 



\ 



