The Greene and McConathy Collections 61 



A carefully selected set of bryozoan specimens for the biologic 

 series was identified and arranged by Dr. J. J. Galloway. The 



"types" of the Schrammen sponges from northwest Ger- 

 Expert man y W ere systematically studied and arranged by Dr. 



Marjorie O'Connell. She also prepared an extensive re- 

 port entitled "The Structure and Classification of the Silicispongise 

 as illustrated by the Schrammen Collection in The American Mu- 

 seum of Natural History." For a few weeks during the summer 

 Dr. Elvira Wood collected illustrative material for the new panel 

 extensions to the table cases which contain type specimens. She 

 also prepared a preliminary sketch of an exhibit, composed of 

 specimens and models, demonstrating "Recapitulation in the Pele- 

 cypoda." 



In March, work was started on a large model of a section of the 

 Grand Canyon of the Colorado in the vicinity of Grand Canyon, 



Arizona. Portions of the Bright Angel and Vishnu topo- 

 Grand graphic sheets of the United States Geological Survey were 

 Mo'del enlarged four diameters and serve as an excellent contour 



map for developing the various elevations. The shape of 

 the model is irregular, owing to the hexagonal outline of the end 

 of the upright case where it is to be installed. It is being built 

 of wood in four sections in our laboratory. Two sections have 

 been completed and a good beginning has been made on the third 

 and fourth. Mr. Hill has been engaged on this work from the 

 start, Mr. Brickner and Mr. Foyles for a part of the time. When 

 the model is completed it is proposed to continue the topographic 

 and geologic features of the model on a painted background— the 

 whole to present a miniature picture of the region. 



A card catalogue of the labeled specimens in the department 



has been begun and fifteen thousand cards have 

 Card Catalogue , ... 



been typewritten. 



Our general meteorite collection, which is second if not first 

 in rank in this country and is one of the four best 

 Meteorite collections in the world, is temporarily displayed in 

 separate alcoves in our main exhibition hall. 



The most important accessions of the year have been the 

 G. K. Greene and W. J. McConathy collections of invertebrate 

 fossils, purchased in October. It has been estimated that the 



