184 NEMATOPHYCES. 
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 Ulothria and Schizogonium 
are concerned. It is entitled “On the Diamorphosis of Lyngbya, &c.,” 
in the “ Quart. Journ. of Microscopical Science ’”’ for 1861, pp. 157-166. 
Schizogonium murale. Kutz. Tab. Phyc. 11., t. 98, f. 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--018 mm. 
Rabh. Alg. Eur, iii., 368. Kirch. Alg. Schl. 78. 
On moist walls and naked ground. 
Plate IXXT, fig. 3. Portions of threads of Schizogonium murale 
X 400 diam. 
Famity VII. CHROOLEPIDEA. 
Aerial alge, 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 
ina 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, 111., 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 Trentepohlia 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, Sept. 28, 1858). “ 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, 
