NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA GRANT 3 



1846), which in turn is senior synonym of Camarophoria King ( 1850) . 

 The type species is Terebratula schlotheimi von Buch (1835) from the 

 Middle Zechstein at Possneck, Thuringia, (East) Germany. This spe- 

 cies is well documented, and specimens of it are distributed widely in 

 museums. However, because it is a highly variable species, differentia- 

 tion among species of Stenoscisma and among genera in the Stenoscis- 

 matacea is somewhat difficult. Although costation seems to be a signifi- 

 cant generic character among Devonian and Mississippian members of 

 the superfamily, the single species S. schlotheimi has both strongly 

 costate and nearly smooth individuals. Outline also is important in 

 earlier groups, but S. schlotheimi ranges from narrowly subpentagonal 

 to widely subelliptical. Consistent features of the type species are its 

 high fold, adult stolidium, long spondylium and camarophorium, and 

 overlapping posterolateral valve edges. These characters tie it to other 

 species of Stenoscisma and differentiate it from other genera of the 

 superfamily. 



ACKNOWLEDGMENTS 



Primary thanks are due G. A. Cooper, U.S. National Museum, who 

 made available for study the large collection of Devonian stenoscis- 

 mataceans from the Traverse Group of Michigan, collected by him and 

 Mrs. Cooper during summer "vacations" over the last decade. Dr. 

 Cooper also granted permission to study the worldwide stenoscis- 

 matacean collection in the Museum and to draw upon unpublished data 

 derived from silicified specimens from the Permian of West Texas. 



Further acknowledgment is made to A. Williams, Queens College, 

 Belfast, for encouragement to undertake study of the Stenoscismatacea 

 for the forthcoming brachiopod volume of the "Treatise on Inverte- 

 brate Paleontology" ; to Yale University, through K. M. Waage, A. L. 

 McAlester, and R. Horton, for loan of specimens from the Schuchert, 

 Dunbar, and R. E. King collections; to the University of Texas, 

 through P. Rodda, for loan of specimens from the Texas Bureau of 

 Economic Geology; to Thomas Waller, Columbia University, for 

 specimens from his personal collection; to J. T. Dutro, Jr., U.S. Geo- 

 logical Survey, for access to specimens from Alaska; to the United 

 States Steel Corporation for permission to collect in their quarry at 

 Rogers City, Mich. ; to P. M. Kier, U.S. National Museum, for useful 

 consultation and advice on content and format, for many photographs, 

 and for the use of his camera in photographing serial sections ; to L. B. 

 Isham, U.S. National Museum, for drawings in figures 1-3 and scatter 

 diagrams; and to J. Scott, U.S. National Museum, for most of the 

 photographs appearing on the plates. 



The text was reviewed by G. A. Cooper and J. T. Dutro, Jr., whose 

 patience and care are acknowledged gratefully. 



