374 NOTICES OF BOOKS. 
in arctic, some in tropical regions. Where they occur in the greatest 
plenitude could not yet be predicated, and if Sweden should appear 
from the enumeration to be the most rich, this, the author thinks, is 
140. They are all imbabitants of fresh water ; they are mostly 
epiphytic, seated upon the most varied aquatic plants. 
The author enumerates and gives the diagnosis of the whole of 
the species, embracing those previously made known in his preceding 
w «‘ Dispositio (Edogoniacearum Suecicarum”’ (in “ Ofversigt 
af Kongl. Vetenskaps Akademiens Forhandlingar,” 1870), also 
Genus 1,—Oxpocontus (Link.). 
Section I, Monoicous Species. 
A. Oogonia never furnished with median processes. 
a, Oogonia globose or subglobose (23 species). 
Section II. Dioicous Species. 
; Subsection I. Nannandrous Species. 
A. Dwarf males (nannandres) unicellular. 
a. Oogonia furnished with median verticillate processes (2 
_ species). 
b. Oogonia never furnished with median processes. 
a. Oospores globose or subglobose (7 species). 
8. Oospores subellipsoidal (1 species 
B. Dwarf males (nannandres) bicellular, 
(1 species). 
C. Dwarf males bi-pluricellular, spermogonium ‘ outer.” 
a. Oospores smooth 
a. Oospores globose or subglobose (8 species). 
B. Oospores ellipsoidal or oviform (7 species). 
b. Qospores echinate. 
a. Oospores globose (5 species). - 
B. Oospores ellipsoidal (1 species). 
& 
. . : » 
spermogonium ‘inner 
