PREFACE. Vll 



logiie of Casts." These nunibeTS will be plainly marked on 

 both the specimens and the labels accompanying them. In 

 all cases where casts have been used, it is distinctly stated 

 in the description; where it is not so stated, originals will be 

 furnished. 



Species of small size are usually represented by a number 

 of specimens. The number may slightly vary, but will always 

 be sufficient to fairly represent the species. These small spec- 

 imens will be mounted on blocks, while many of the larger 

 objects will be furnished with individual pedestals, as indi- 

 .cated in the illustrations. 



Occasionally it maybe necessary to substitute some allied 

 form for the one listed; but care will be exercised not to 

 thereby diminish the scope or interfere with the sequence of 

 the collection. 



In the matter of classification, we have considered it better 

 for the purposes of this catalogue to be conservative and fol- 

 low well-known authors rather than to always adopt the latest 

 and, perhaps, the more scientific system. For the classifica- 

 tion and group descriptions, and for geijeral assistance in the 

 publication of the work, we are indebted to Professor H. L. 

 Fairchild, of the University of Rochester. 



The whole collection, mounted and labeled as described 

 above, will be carefully packed and delivered at the railway 

 station in Rochester for the sum of $1,200. 



WARD'S MTOAL SCIENCE ESTABLISHMENT, 



30-40 College Ave. , Rochester, N. Y. 



