1878.] Tlie Paleontologist. 



valve slightly convex ; surface covered with fine radiating striae, those starting at the 

 beak and cardinal line, and extending to the margin larger, generally, than the interstitial 

 striae; one in the center from beak to front most prominent. The radiating striae crossed 

 by very fine crowded concentive lines. Umbo prominent. Beak extending by a sort of 

 cylindrical tube from Y^ a line to a line beyond the cardinal line, which slopes gently to 

 the lateral margins. Dorsal valve slightly concave, the striae appear of equal size, not 

 alternating as on the other valve. Cardinal area and interior of the shell not seen. 



All examples yet examined are on the surface of very friable shale or embedded in it ; 

 from the thinness of the shell it will, probably, be difficult to procure good detached 

 specimens. 



This species resembles S. sijuamula, James, except in the marked feature of the extended 

 beak. Placed provisionally in this genus. 



Named in honor of Mr. E. O. Ulrich, who found the specimens in a quary, near Cov- 

 ington, Kentucky. 



GENUS ORTHIS, (Dalman.) 



Orthis (Platystrophia) acuminata. (James.) Shell small ; width, measuring along 

 the cardinal line, nearly twice the length from beak to front; cardinal line extending to 

 acute points; lateral margins sloping in rapidly, and slightly rounding to the front. 

 About 16 simple, angular plications on the lateral slopes of the dorsal valve and 3 in the 

 sinus, but one of which extends to the beak, the other two being interstitial, commencing 

 about half way between the beak and front. Beak projecting very little ; surface of ven- 

 tral valve the same number of plications as on the dorsal, with two on the mesial ridge at 

 the beak and four at the front. Beak not projecting beyond that of the other valve. 

 Cardinal area narrow. 



Size of the typical specimen y^ an inch by the cardinal line and % of an inch from 

 beak to front. A smaller specimen shows less plications and but one fold in the sinus and 

 two on the mesial ridge. 



Locality — Cincinnati. 



GENUS ZYGOSPIRA, (Hall.) 



ZygOSpira modesta, var. KentuckyensiS. The fossil for which this name 

 is proposed, by the finder, Henry Nettleroth, Esq., of Louisville, Ky., varies so 

 little from Z. modesta. Say, as defined by Meek, except in size, that it can hardly be 

 considered more than a very large variety of that abundant species. Its average size 

 is fully 6 times that of the average modesta, but in all other characteristic features the 

 resemblance is very close. In size it is about equal to Z. Cineinnatiensis, James, but the 

 number of plications are nearly double and the lateral slopes of the ventral valve nituk 

 less depressed than that sp. 



Collected by Mr. Nettleroth, in the upper part of the Cincinnati Group, Jefferson 

 County, Ky., about 18 miles east of Louisville. The difference in size can hardly be at- 

 tributed to difference of horizon, as typical sizes of modesta are found in the Cincinnati 

 Group from the lowest to the highest beds in Ohio and Indiana, and elsewhere. 



GENUS SPIRORBIS. (Lamarck.) 



SpirorbiS (?) Lovelandensis. (James.) Shell very small; whorls less than two, 

 sub-cylindrical, not in contact, enlarging gradually, nearly on a plane ; surface smooth, 

 showing no striae or other markings. Slightly flaring at the mouth ; shell a little over 

 Y^ a line wide across the whorls. 



The typical example lies upon the surface of a fragment of limestone ; nu detached 

 ones observed. * 



Locality — Loveland, Clermont county, Ohio. 



