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 : 



f 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 : 



Rhodymeniacece, r Callithamnion 

 suborder < Griffitlisia 

 CeramiecB ( 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. 



