172 CONJUGATED. 



globules of the other species of the same family ; on the con- 

 trary, the green matter Avhich it incloses has appeared to 

 me to present nearly the same form, so that I know not how 

 the grain is formed, nor in what way the derelopement in this 

 species is brought about ; only I have remarked distinctly 

 three or four bright grains immersed in this green matter, 

 and I have seen in the month of Ajjril the cells separate 

 from each other and sink in the water, but I traced them no 

 further. Nevertheless, I have difficulty in believing that the 

 brilliant grains are not the germs. 



" ' Since writing this description I have seen the germin- 

 ation of this Conjugata elsewhere in a manner very different 

 from all the others : the matter does not pass from one tube 

 to another neighbouring tube, but each cell Itself furnishes 

 a single young plant, the Interior tube which it was found to 

 enclose becoming a young Conjugata which was entirely con- 

 tained in the old tube, as it itself contains the plants which 

 are afterwards to become developed ; it issues by the ex- 

 tremity when it occupies the last cell, and by the sides when 

 it is found in one of the central cells.' 



" With respect to the observations of Vaucher in reference 

 to the germination of the young Conferva while still within 

 the parent cell, I would observe that I have never witnessed 

 this singular developement, and can confidently assert that 

 this is not the legitimate or normal mode of developement of 

 the species of the genus Mougeotia, which is by zoospores, de- 

 veloped external to the cells, as in other Conferva'' 



1. MOUGEOTIA MAJOR Ilass. 



Plate XL. Fig. 1. 



Char. Filaments of considerable size. Cells usually five times 



as long as broad. 

 JSIougeotia major Hassall, In Annals of Nat. Hist. vol. x. 



p. 44. 

 Hab. Cheshunt : A. H. H. 

 Either this species and the following are subject to very 



