VI INTRODUCTION. 



and England, and in part American species from Prof. Hall's rich col- 

 lection. 



Among the Molluscs, 



the Cephalopoda attract especial attention. The Dibranchiates are 

 shown by some interesting Belemnites and Teuthidians, while the 

 Ammonites, — mainly from the Ward Museum of the University of 

 Rochester, and from the author's private Cabinet, — illustrate the 

 " types" of Von Buch and D'Orbigny, adding also many large and rare 

 forms ; and are without question the most perfect series of these shells 

 which has ever been copied. There are also many interesting speci- 

 mens of the Nautilida? and Orthoceratidae from America and Europe, 

 and the Hippuritidse and Mesozoic Brachiopoda from France, and 

 Palaeozoic Brachiopoda from England and America, are worthy of espe- 

 cial notice. 



Among the Radiates, 



are 105 Echinoidea, most of which are chosen from a series issued many 

 years ago by Prof. Agassiz at the time of his important publications on 

 this order. Also, a very rich series of Crinoidea, — some of the larger 

 ones from European localities, but in the main Paleozoic species from 

 localities in New York and the Western States, and furnished by the 

 Cabinet of Prof. Hall. 



Finally, the Protozoa, 



are represented by a series of 200 Foramenifera which — enlarged 50-75 

 diameters — illustrate beautifully the strange, bizarre forms of these 

 minute animalisms. The division closes with a suite of Sponges, 

 mainly of Cretaceous age, from European localities, the originals of 

 which are in the Ward Museum of the University of Rochester. 



Many minor divisions are omitted in this short resume. It is 

 sufficient to say that the whole number of twelve hundred specimens, 

 which are given in this assemblage, have been chosen for their individ- 

 ual, scientific value. Some specimens have a traditional interest, as 

 connected with the growth of Geological Science. Others — like the 

 Megatherium and Iguanodon — are fossils of general celebrity. Others 

 are chosen and made up into suites, to illustrate by chosen forms the 

 natural sections in various Zoological groups. 



The student of Geology will find here a very large proportion of those 

 genera and species which mark the several divisions of Geological time, 

 and which are cited and figured in his text-books as " characteristic 

 fossils"; while the investigator of fossil Zoology will also have posses- 

 sion of many scores of extinct forms which will complete his cabinet- 

 series. 



