18 INTRODUCTION 
name of the collector and some interesting comment. On the 
lower left-hand corner of the genus-cover is written the generic 
name in full and the species of that genus which the cover con- 
tains, thus: 
C. rubrum 
Ceramium C. strictum 
C. diaphanum 
The genera of an order are then placed within a cover and labeled 
in the same way, the legend then having the name of the order 
on the left and the genera on the right of the bracket, thus: 
Khodymeniacee, ¢ Callithamnion 
suborder Griffithsia 
Ceramiew Ceramium = — 
When the order is a large one the genera are distributed through 
as many covers as may be necessary. The covers are then 
arranged on shelves in the regular order of their classification, 
and each shelf is labeled with the order it contains. Herbarium- 
sheets cost at retail one dollar per hundred. Genus-covers cost 
at retail one dollar and eighty cents per hundred. 
