PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued Mi(v d MM by (he 



SMITHSONIAN INSTITUTION 



U.S. NATIONAL MUSEUM 

 Washington : 1934 



Vol. 83 No. 2972 



CORYNECRINUS, A NEW DEVONIAN CRINOID GENUS 



By Edwin Kirk 



United States Geological Survey 



In the collections of the United States National Museum was found 

 an inadunate crinoid labeled, in Carl Rominger's handwriting, 

 "Poteriocrinus?, Helderberg group, Clark Co., Indiana." It was 

 almost completely embedded in hard crystalline limestone. The 

 structures exposed, however, indicated a crinoid of unusual type, and 

 preparation of the specimen proved it to be referable to a new genus, 

 which is here described as Corynecrinus. The crinoid proves to have 

 structural features of considerable interest, and in its relationship 

 seems to be nearer certain European Devonian forms than any 

 otherwise known in America. 



The specimen shows the greater part of the dorsal cup, about 5 mm 

 of the proximal portion of the column, the anal tube to a length of 

 some 15 mm, and three of the arms to the first bifurcation, having a 

 length about equal to that of the anal tube as preserved. The exposed 

 surface of the specimen was somewhat weathered, intensifying frac- 

 tures in the plates and in some instances making it difficult to distin- 

 guish the fractures from sutures. On the whole, however, the crinoid 

 is in an excellent state of preservation. 



CORYNECRINUS, new genus 



Corynecrinus is a dicj^clic inadunate crinoid here referred to the 

 new family Lecythocrinidae, of the suborder Cyathocrinoidea. The 

 genotype is Corynecrinus romingeri, new species. 



1 Published by permission of the Director, U.S. Geological Survey. 

 71630— .34 



