58 SMITHSONIAN INSTITUTION 



SCYPHOCRINUS 



PLATE I PAGE 



Scyphocrinus elegans Zenker 30 



Helderbergian. Cape Girardeau, Missouri 

 The principal slab described in the text, about 120 by 165 cm. (4 by 5.5 ft.) in size. 

 It contains about 24 crowns, of which 18 have a large part of the arms intact. 

 Those which have been specially used for the descriptions and figures are 

 indicated by letters A to G. At H and / may be seen two Camarocrinus bulbs 

 with the stemless side exposed; at L and K are parts of other bulbs broken by 

 pressure and partly imbedded. For convenience of measurement a scale is added. 

 Reduced by photography to ^. 



Photographed by Dr. R. S. Bassler of the National Museum, and somewhat 

 retouched by Mr. Chapman. 



The slab is from a limestone layer about 4 to 6 inches in thickness, resting 

 upon a parting of shaly clay. 



The specimens now visible were all partly imbedded in the underlying soft 

 clay layer, being attached to and gradually passing into the firm limestone above, 

 which for a thickness of about 2 inches is entirely composed of broken remains 

 of stems, crowns, and bulbs. In studying this photograph it must be remembered 

 that the surface now seen was the under surface of the slab as it lay in the 

 formation, and that the aspect of the fossils is that of their lower side as they 

 settled into the sea bottom. 



Author's collection. Now mounted in the Hall of Invertebrate Paleontology, 

 U. S. National Museum. 



