Palco)ilology of the Cincinnati Group. 45 



MANUAL OF THE PALEONTOLOGY OF THE CIN- 

 CINNATI CxROITP. 



Bv Josi-.i'H F. JAMKS, M. Sc, F. G. S. A. 



(U. S. Geological Survey.) 



Part I. 



The object in view in preparing the series of papers, of 

 Avliich this is the first, is to present to the students of paleon- 

 tology of the Ohio valley, in a convenient form, descriptions 

 of the fossils known to occur in the rocks of Lower Silurian 

 age in Southwestern Ohio and the vicinity. The generic and 

 specific descriptions are scattered through many different 

 volumes, and the writer believes the collation and arrange- 

 ment of them in a compact form will be an assistance and an 

 incentive to the study of paleontology. The present, the 

 first installment, treats of Plautoe and Protozoa. 



PLANTS. 

 ALG/E. 



Under the head of Fiicoids, wdiich have generally been con- 

 sidered as Algce, a number of species have been described by 

 authors. It is extremel}' improbable that Algcc have left any 

 remains in this formation. An attentive study of the forms 

 described as Fiicoids shows the larger number to be referable 

 to annelid borings or burrows ; or else to be inorganic in 

 origin. Some may be referred to impressions left by certain 

 forms belonging to other classes, and possibly to graptolites. 

 None are, we believe, to be assigned definitely to the class 

 Alga. The forms of inorganic origin will be treated of here. 

 Those referred to other classes will be discussed under each, 

 respectively. (See under C(£lenterata, Hydrozoa, As- 

 TERiDEA, Annelida and Trails.) 



Consult in respect to the supposed Alger "Fucoids of the 

 Cincinnati group." This Journal, vol. 7, pp. 124-132, 151- 



