'27 



not seem to increase with the size of the shell, but is uniform 

 throughout the length of our specimen. The lines do not curve 

 forward toward the aperture in the furrows, at the angles, as is 

 usual in this genus, but they arise from the bottom of the fur- 

 rows and cross the sides in regular arches. There are about fifty 

 of these transverse lines in an arch. 



Our specimen has a length of nearly five inches. The trans- 

 verse diameter at the small end is an inch one way, and an inch 

 and one- twentieth the other, and at the large end an inch and a 

 half one way and an inch and six-tenths the other. It is quite 

 evident if the specimen was complete it would be more than a 

 foot in length. 



It is unnecessary to compare it with any other specimen for 

 the purpose of distinguishing it. 



Found in the Coal Measures of Luzerne County, Penn., and 

 presented to S. A. Miller by Rev. Wm. Roeper, an ardent col- 

 lector and naturalist, in whose honor we have proposed the 

 specific name. 



CONDLARIA GREENEI, n. sp. 



Plate III, Fig. 3, middle part of a specimen. 



Species long, slowly expanding, pyramidal, subquadrate, sides 

 equal, deeply furrowed at the four angles. Longitudinal line in 

 the middle of each side. Surface ornamented with wide, concave, 

 smooth furrows that arch forward from the four angles. These 

 furrows are separated by sharp costfe generally without crenula- 

 tions. The costiB sometimes cross the mesial line without inter- 

 ruption, in other cases they terminate alternately at the mesial 

 line. They do not curve forward when bending into the furrows 

 at the four angles, nor do they reach the bottom of the furrows. 

 They alternate in these furrows. The transverse furrows are 

 crossed by a few longitudinal wrinkles, at the margin of the 

 longitudinal furrows. 



There are only thirteen transverse furrows in an inch, where 

 our specimen is eight-tenths of an inch in diameter. The shell 

 of our specimen is horny, and has the smooth, hard appearance of 

 the test of a trilobite. 



This species is so different from all that have heretofore been 

 described, from the Keokuk Group, that no comparison with any 

 of them is necessary. It is distinguished by its slender form, 

 wide, transverse, smooth furrows and sharp cost;e. There are 

 some slight crenulations on the costas, toward the larger end of 

 our specimens, but none toward the smaller end. 



