1 84 NEMATOPHYCE^E. 



structural difference between the two." The whole of the communica- 

 tion from whence the above is quoted is worthy of attentive perusal, 

 at least in so far as the relations between Ulotlirix and Sckizogonitim 

 are concerned. It is entitled " On the Diamorphosis of Lyngbi/a^ &c.," 

 in the " Quart. Journ. of Microscopical Science" for 1861, pp. 157-166. 



Schizogonium murale. Kuiz. Tab. Phyc. n., t. 98, /. 1. 



Dark green, forming a broadly expanded soft velvety 

 stratum, threads sometimes free, here and there two or three 

 united, cells 2-4 times shorter than their diameter, pectinate, 

 often crowded, sometimes interrupted, cell membrane rather 

 thick, colourless, slightly undulated and constricted. 



SIZE. Cells -015--018mm. 



Kabh. Alg. Eur. iii., 368. Kirch. Alg. Schl. 78. 



On moist walls and naked ground. 



Plate LJ.XI. fig. 3. Portions of threads of Schizogonium murale 

 X 400 diam. 



FAMILY VII. CHEOOLEPIDB^. 



Aerial alga3, coloured golden yellow, orange or red -brown, 

 when dry often becoming greenish grey ; more or less fragrant 

 with the odour of violets. Threads articulate, variously 

 branched, cell membrane thick, or somewhat thick, firm, almost 

 cartilaginous, collected in minute tufts, or densely interwoven 

 in a thin or thick tomentose stratum. Cell contents oily or 

 granulose, either red, orange, or yellow brown, growing paler 

 after death. 



Propagation by zoogonidia, produced in proper cells 

 (sporangia) which are terminal, or by prolification formed 

 laterally. Zoogonidia oblong-oval, furnished at one extremity 

 with two vibratile cilia. Rabh. Alg. Eur. in., 371. 



GEN. 69. CHROOLEPUS. Ag. (1824.) 

 Characters the same as given above for the family. 



There appears to us no occasion or justification for the substitution 

 of Trtntepohlia for the above generic name as some authors have 

 done. 



The following is an abstract of the process of reproduction, as ob- 

 served by Dr. Caspary. (Flora, ^f. 28, 158). 'The apical cell of 

 the threads has often' a globular or pulvinate appendage, of a highly 

 refractive nature, furnished with transverse wrinkles, and frequently 

 also with a protuberance at the top. The whole cavity of the cells is 

 filled with granular matter, mostly of a brownish red colour, but it 

 frequently happens that the inner granules only are brownish red, 



