NOTICES OF BOOKS. ; 309 
a supposes that the large cells are fertilised by the small ones, and 
io ther and smaller species of the genus which was found 
eu among unicellular Alge. The other genus, Blastocladia 
(B. Pringeltints, is found in water containing putrefying apples. It 
is unicellular, and eenene of a tube producing a system of — 
rootlets at one end, and at the other a variable number ostly 
regularly whorled fertile euaehun. What the sa has litle ¢ doubt 
are sporangia and oogonia are developed in the upper half of the 
latter oval. A third supposed reproductive structure, which seems to 
us. even more like some — tridioid growth than the ‘‘sporangia” and 
“‘ oogonia,” is long and narrow. new sp we casc (s. ee) 
growing with Blaatocladia i is formed of a certain 
chain-like threads. The sporangia are maiseiew ope n at the tani ran 
are included inside older empty ones. The oogonia were not foun 
The ‘stachelkugeln” in Achlya { Dapsiliopest Pig i — the 
nature of which Cornu—whose monograph in he 
Tue GeRMINATION oF THE GENUS Mecarruwa, Zor. By Asa Gray: 
(Silliman’s Journal, July, 1877.) 
ps of Hf. californica do not remain hypogean, but come up 
above the soil raised on what appears to be a well-developed radicle, 
but which is in reality formed of the united elongated petioles of the 
eos: The plumule is situated underground, quite at the base 
of alse radicle, and immediately below the plumule is seen the 
thickening of the true radicle. After a time the united petioles be- 
co 
lated to protect the boca soelives from browsing enemies. 
“hoi sgl of Books. 
Fl Mauritius and Seychelles: a Description of the oe 
Mots eG etd Ferns of those Islands. By J. G. Baxer, F.L.S. 
Published under Fos authority of the Colonial Government of 
Mauritius. London: L. Reeve & Co. 1877. (8vo. Pp. 557. 
Anoraxr of the Colonial Floras issued under peg patronage. 
The plan is that of the Honghaas © as Tropical a Flos and it 
een prepared entirely at the Kew Herbarium. “The hids have 
been descri pencer Moore, and the Palms and Pandanacra 
by Dr. L. B, Balfour : the remainder is the work of Mr. Baker. 
plate of Rodriguez ae included, but not those of the French island 
