THE AMERICAN MUSEUM JOURNAL 



used by an author in the original description of a species, but also 

 those specimens which have been used by the same author in the 

 further elucidation of the species in subsequent publications. 

 The types may or may not have been illustrated in connection 

 with the first publication. "Figured specimen" is the term ap- 

 plied here to the specimens which have been identified with a 

 species by another person than the author of the species and 

 which have been illustrated in some publication. From the 

 standpoint of the student and investigator, such specimens are 

 the most valuable portion of any collection, and should, there- 

 fore, be marked in some conspicuous manner and be preserved 

 with the greatest care, while the knowledge of their location and 

 their history should be as widely disseminated as possible. All 

 the types and figured specimens in this Department are indi- 

 vidualized by the use of a small rhomb of emerald green paper 

 securely gummed to each. 



There are in this Department of the Museum 8,345 type and 

 figured specimens, representing 2,721 species and 190 varieties, 

 distributed in the Catalogue according to the following table: 



Part I, issued in July, 1898, embraces the specimens in 

 the Cambrian and Lower Silurian systems; Part II, issued in Oc- 

 tober, 1899, includes the material from the Upper Silurian system ; 



