ARTICLE YIII. 



DESCRIPTIONS OF NEW SPECIES OF FOSSILS 



FnOM TUE 



CLINTON, LOWER IIELDERBERG, CHEMUNG, AND WAVERLY GROUPS, FOUND IN THE COLLEC- 

 TIONS OF THE GEOLOGICAL SURVEY OF PENNSYLVANIA. 



BY GEORGE B. SIMPSON. 



Read before the American Fhiloaopbical Society, December 21, 1888. 



In determining the species in the collections of Messrs. Hall, Sherwood, Fellows, 

 and Others, I fonnd a number of species which I could not reconcile with any known 

 to me, or with any published in the books to which I had access. 



Prof. James Hall, of Albany, N. Y., was kind enough to review these specimens 

 with me, and decided that many of thera were new. Of these new species nineteen 

 are described in this paper. The eleven other species I had no opportunity to submit 

 to him, but I have no doubt that they also are species that have not hitherto been 

 described. 



George B. Simtson. 



