FOREWORD 



This paper, originally intended merely as an account of a remarkable dis- 

 covery in 1912, having a decisive bearing upon the distribution and morphology 

 of the genus Scyphocrinus, and its relation to the bulbous organism hitherto 

 called Camarocrinus, has by force of repeated further acquisitions of material 

 expanded into a memoir requiring for its illustration nine plates and numerous 

 text-figures. The drawings for the plates were executed by Mr. Kenneth M. 

 Chapman, now of Santa Fe, New Mexico, with his usual skill and fidelity. The 

 text-figures have been prepared with much care by my assistant, Mr. Herrick 

 E. Wilson, whose studies of the structural details have greatly facilitated the 

 present explanation of the internal characters of the Camarocrinus bulbs. For 

 the valuable aids thus contributed I wish to express to both these gentlemen 

 my acknowledgment and appreciation. 



Frank Springer. 

 Washington, January 17, 1917. 



