38 Cincinnati Society of JSTatural History. 



The specimen fignred is from tlie collection of Mr. Dyer, aud v^'■as 

 collected in the upper part of the Niagara Group at AValdron, Indiana. 



CoNULARiA f ORMOSA, u. sp. (Plate I., fig. 12, natural size; fig. 12a. 

 magnified view of a portion of the surface showing tlie tubercles. 



[Ety. — Formosus, beautiful-] 



This species in general form is pyramidal, somewhat quadrangular, 

 angles furrowed, and sides somewhat rounded as in C. trentonensis. 

 The surface is marked b}^ rounded furrows, separated by obliquely 

 transverse ridges, extending from each angle of the shell diagonalh' 

 towards the moutb, and meeting those from the opposite angle in the 

 middle of each side. These ridges are ornamented with small nodes 

 or tubercles at the junction with the strise, which cross the furrow on 

 the side toward the apex of the shell. The rounded furrows are 

 crossed by stri;i3, which are about twice as numerous as the transverse 

 ridges, and which terminate on the ridge toward the mouth of the shell 

 in a small tubercle. The longitudinal stri;^ do not cross the transverse 

 ridges, nor are they continued in straight lines on the opposite sides 

 (the magnified view is erroneous in this respect), but on the contrary 

 the striae, which cross the furrows, commence at the ridge toward the 

 apex, at a point between the tubercles, and crossing the furrow toward 

 the mouth terminate'^at the tubercles. 



This species is readily distinguished from C. trentonensis, which it 

 most resembles in general form, by the tubercles on the transverse 

 ridges. Even badly exfoliated specimens may be distinguished b}' the 

 aid of a pocket magnifier. 



The specimen illustrated is from the collection of C. B. Dyer, aud 

 was found in the upper part of the Cincinnati Group, near Versailles. 

 Ind., by Dr. W. H. H. Hunter. Another specimen, showing very promi- 

 nent tubercles, was collected b}^ Dr. C. A. Miller, on the top of the hill.^ 

 near the city of Cincinnati, and is now in S. A. Miller's collection. 



Spirorbis cincinnatiensis, n. sp. (Plate I., fig. 13, magnified 

 nearly 7 diameters.) 



The shell is discoidal, and consists of more than one volution. The 

 diameter of the specimen figured, is a little less than a line, aud is 

 magnified to six lines, to show the markings more distineth". It is 

 slightly compressed at the aperture, which appears to have been round 

 originall3^ The tube is round, except on the interior face, where it 

 appears to be depressed, as if for another volution, which is not visi- 

 ble, in our specimen. The surface is marked by closely crowded, fine, 

 transverse lines until the}' approach the aperture, when they become 

 somewhat diagonal in their direction, and are followed by seven more 



