274 Some Remarks on Plumulites Jamesi. 



as the lateral lobes ; lateral lobes flattened two thirds the way out, 

 where they abruptly curve downward/ narrow slightly posteriorly ; 

 pleuree straight and transverse, two thirds of their length, where they 

 are geniculated, curving slightly backward, terminate in short mu- 

 cronate spines. 



Fig. J 8, a. Spherocoryphe robustiis. 

 Fig. 18. 6. Spherocoryphe robuslus; section of glabella. 



Pygidiuni, mesial lobe composed of three segments, anterior segment 

 largely developed, its extemities being produced into long stout 

 spines, incurved toward their points; posterior margin a rounded 

 ridge, curving backwards between the spines, forming a subtriangular 

 depression, upon which, the two posterior segments are situated ; entire 

 surface finely granulated ; upon the upper surface of the globose gla- 

 bella the granulations are coarser, so as to be distinguished by the 



eye. 



This species is related to S. granulata (Angelin), and S. salteri (Bill- 

 ings), but differs materially from the descriptions of those species. 



Formation and locality : In the upper third of the Trenton Lime- 

 stone, Trenton Falls, New York. 



Some remarlcs on Plumulites Jamesi of Hall and Whitfield. 

 By S. A. Miller. 



Through the kindness of U. P. James Esq., I have been permitted 

 to copy the description (which will appear in the forthcoming volume 

 of the Ohio Paleontology) of Plumidites jamesi, by Profs. Hall and 

 Whitfield. It is as follows : 



