140 
REFERENCES TO THE PLATES. 
Plate XLYIII. 
XLIX. 
A. — -Petalonema alatum, Berk. p. 99. 
B. — Microcoleus corymbosus, Harv. p. 109. 
C. — Calothrix pilosa, Harv. p. 106. 
D. — Calothrix dura, Harv. p. 107. 
A — Bangia vermicularis, Harv. p. 55. 
B — Pilcea Californica, Suppl. p. 181. 
A. — Dasya Harveyi, Ashm. Suppl. p. 127. 
B. — Chondria nidifica, Harv. Suppl. p. 125. 
PUBLISHED BY THE SMITHSONIAN INSTITUTION^ 
WASHINGTON CITY, 
MARCH, 1858 . 
