Description of a Trilohite. 131 



nal; about ten of the ordinary or smaller sized cells occupy the space 

 of one line. None of the specimens examined exhibit minute inter- 

 stitial tubuli. Under surface not observed. 



This is a very beautiful species, which can readily be distinguished 

 from the other discoidal species of the genus, by its very broad, low 

 monticules, and the regular arrangement of the cells, as well as b}' 

 the large size of those occup3dng the monticules. 



Formation and locality: occurs at an elevation of about three hun- 

 dred and fifty feet above low water mark in the Ohio river, in the 

 Cincinnati Group, at Cincinnati, O. 



Collectors: J. G. Fine, H. Dickhaut, E. O. Ulrich. 



DESCRIPTION OF A TRILOBITE FROM THE NIAGARA 



GROUP OF INDIANA. 



By E. O. Ulrich. 



Calymene nasuta, n. sp. 



{^iy. —yasiitus, snouted.] 



General outline sub-ovate, the breadth and length being respectively 

 as five to seven; convexity just anterior to the pj'gidium about three 

 fourths the width at that point; convexity at anterior portion of 

 thorax and of cephalic shield as one to three or four. 



Cephalic shield, without the remarkable proboscis or frontal exten- 

 tion, sub-semielliptical, approaching sub-lunate; the anterior border 

 being more or less regularly rounded, and the posterior somewhat 

 sinous; posterior lateral extremities abruptly rounded or sub-angular; 

 glabella prominent and strongly defined from the cheeks and front 

 margin by deeply impressed furrows; the Uso posterior pairs of lobes 

 are distinctly defined by deep lateral furrows, which, especially in the 

 posterior pair, pass almost completely around the lobes; the latter are 

 about twice as large as the former, while the anterior pair are A^ery 

 small, all being nearly round; central portion of glabella much wider 

 at base of frontal prolongation than at the neck furrow, which is well 

 defined; neck segment prominent, slightl}^ larger than the first thoracic 

 segment, and considerably arched forward. Front margin recurved, 

 remarkably extended upward and forward, in the form of a compressed 

 and blunt cone, or the superior margin may be more rounded; the 

 length of this proboscis varies, according to the size of the specimen, 



