64 Report of the President 



here a grotto showing a mode of occurrence of the ore in the 

 famous Oklahoma-Kansas-Missouri lead and zinc district. 



The core of the second topogeological relief model, that of 

 the Mount Holyoke Range region in Massachusetts, was fin- 

 _ , . ished in 1918. The core of the Watkins Glen 



lopogeologi- 



cal Relief region in Central New York State (to show 



Models Finger Lake and Glacial Drift phenomena) was 



finished, and that of the Standing Stone Tennessee region (to 

 show typical sinkhole topography in an unglaciated limestone 

 country) was prepared during the current year. The core of 

 a fourth model, to show the topography and geology of the 

 famous White Mountain, New Hampshire, region, is three- 

 fourths done. 



The preparation of the card index of the Whitfield catalogue 



of invertebrate fossils has been continued through arranging 



in alphabetical order the 20,000 or more cards 



Catalogue \_\ms, far prepared from the old books and 



Work 



through advancing the triplicate sheets and cards 



therefrom, and from the cataloguing of other fossil material. 

 About 4,000 cards and individual labels, for the Hitchcock 

 Collection of Vermont and New Hampshire rocks and for a 

 portion of the general geological collection, have been pre- 

 pared. Some 25,000 mounts of exhibition specimens have 

 been supplied with temporary labels, the data being taken from 

 the Whitfield catalogue. 



Dr. O'Connell's monographic paper on the Silicispongise 

 appeared in the second half of the year and has received much 

 _ . .. . favorable criticism and comment. The collec- 



rubhcation ... . . 



and tion of invertebrate fossils, made m Porto Rico 



Research by Dr q A. Reeds and Mr. P. B. Hill in 191 5, 



has been subdivided into zoological groups, certain of 

 which have been apportioned to specialists for study, identifi- 

 cation and description. The echinoderms were intrusted to 

 Doctor Robert T. Jackson of Peterborough, New Hampshire, 

 and the Mollusca to Doctor Carlotta J. Maury, then of this 



