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CORRECTIONS AND ADDITIONS. 
for Najadaceae read Naiadaceae. 
from below, before 1. C. Indica, insert the sign (7) in- 
dicative of recent introduction. 
6, for 18 read 19 
for Biine read Biise. 
for R. & L. read R. & S. 
for colletion read collection. 
from below, for C. fragilis read C. fragilis, Bernh. 
A. spath nlinikiis, Hook. Sp. Fil. IIT, 170 (not J. Smith ?). 
Very grave doubt exists as to the correctness of this 
name. In the manuscript stood originally A. insititium, 
Brack. Fil. U.S. E. E 261, tab. 22. This had been 
crossed out, and in pencil above appeared A. spathu- 
linum, followed by a mark of interrogation. The original 
synonym in place of A. insititium, as aga and Metten. 
(line 23), was A. spathulinum, Hook. Sp. Fil. II, 170 
(not J. Smith?). This had likewise as erased ‘in the 
synonym as printed substituted. It should here be 
remarked that in the key to the genus (page 586, line 3) 
the manuscript name A. spathulinui had been sub- 
stituted in pencil for A. insititium. It is evident that 
the author had not reached a final decision as to the 
name to be given to No. 24. It therefore seemed best 
after deliberation to print the specific name with citation 
as it appears, although in so doing the difficulty was 
encountered that this name elsewhere (p. 598) appears 
as a synonym for A. insititium, Brack. The remarks 
at the foot of page 598 and the head of page 599 should 
be consulted in this connection. It is possible that the 
mark of interrogation (line 7, page 604) should not apply 
to J. Smith alone, but to what precedes as well. 
for Ava read Aru. 
