given ont in fresh water. The substance is membranous, but not gelati- 
nous, and in drying the frond adheres pretty closely to paper. 
I am indebted to my often-mentioned friend G. Clifton for the 
specimens here figured, which greatly exceed in size and beauty 
those which I myself collected in 1854. They serve to confirm 
the specific identity, but add nothing further to the history of 
the species, whose cysfocarps still remain to be ascertained. 
Among Australian species of De/esserta our D. crispatula has. 
no very near ally. In its articulated midrib and delicacy of 
membrane it agrees with D. hypoglossoides, from which it differs 
very much in ramification. In this latter character it agrees with 
D. denticulata, but differs in size, in tenuity, in the perfectly 
entire margin, and in the articulated midrib; which last charac- 
ter will serve to distinguish it from all states of D. alata. 
Hig. 1. DELESsERIA CRISPATULA,—¢he natural size. 2. Apex of a segment 
of the frond, bearing sporophylls and sori im the apices. 3. Small portion 
of the frond, to show the jointed midrib and cellular tissue. 4. A sporo- 
phyll. 5. Tetraspore from the same :—the latter figures magnified. 
