84 A^tg- F- Focrste 



the set accompan3'ing Green's Monograph of North American 

 Trilobites. This cast certainly does not represent the common 

 trilobite of the Cincinnati group, as exposed at Cincinnati, Ohio, 

 if, indeed, it correct!)^ represents any species whatever. Only the 

 posterior and middle pairs of the lateral lobes of the g-labella are 

 indicated. There is no trace of the anterior pair of lobes. It is 

 not probable that any species with these characteristics exists. The 

 front of the glabella should extend in front of a line connecting the 

 anterior parts of the palpebral lobes. Moreover, there is an even 

 slope from the front of the glabella to the anterior margin of the 

 cephalon, while there should be a deep depression here, defining the 

 anterior margin of the glabella, and separating it from the ante- 

 rior portion of the cephalon. The nasute anterior outline of the 

 cephalon is not as strongly pronounced as in the nasute Calymenes 

 from the Trenton of New York. As a matter of fact, there are 

 specimens of Calynicue from the vicinity of Cincinnati, which 

 have an equally triangular outline in case of the cephalon, but in 

 none of these are the anterior lobes of the glabella, nor the still 

 more anterior frontal lobe of the glabella, absent. 



It is evident from the original description that Green was im- 

 pressed by the anterior attenuation of the cephalon, in other words, 

 by its nasute outline; and by the absence of the anterior part of 

 the glabella, as found in Calymcnc blunicnhachii. His statement 

 that the oculiferous tubercles are rather lower down on the cheeks 

 than usual does not describe the Cincinnati an form, whatever this 

 expression may mean. 



The specimens in the cabinet of the New York Lyceum and 

 in that of J. P. Wetherill, from the vicinity of the Miami river, 

 near Cincinnati, Ohio, and those from Indiana, correlated with the 

 Hampshire type by Green in his original description undoubtedly 

 belong to the same type as the series from Cincinnati described by 

 Meek as Calymene scnaria, but if the type ever be found it may 

 turn out to belong to an entirely different horizon. 



Calymene meeki, nom. nov. 



(Plate III, iig. 18.) 



For the species so well described by Meek from the Cincin- 

 natian rocks of Ohio, as Calymcnc scnaria, the term Calymene 

 niccki is here proposed. As types, the large specimens from the 

 Fairmount bed, with a rather extended posterior outline of the 

 cephalon, resulting in acute genal angles are chosen. 



