240 TWEXTY-THIRD REPORT OX THE StATE CABiyET. 



NOTICE OF THREE NEW SPECIES OF FOSSIL SHELLS FROM THE DEVONIAN 



OF OHIO. 



Leiorhynchus Newbeeryi n. sp. 



Plate 11, flgs. 25-27. 



Shell large, ventricose and suborbicular, with slightly projecting 

 beaks, a scarcely elevated mesial fold on the dorsal valve, and a cor- 

 responding depression on the ventral. 



Surface marked by numerous subangnlar, bifurcating plications, 

 which are strongest on the mesial fold and sinus ; and also by fine, 

 closely arranged concentric lines of growth, which, in larger specimens, 

 become more numerous toward the frbnt>. 



The number of plications varies in different individuals ; some spec- 

 imens have only about three in the space of a fourth of an inch, on the 

 middle of the shell ; while others have from six to eight. 



This species difl'ers from any other described, in its greater gibbosity, 

 larger number of plications, and generally larger size. 



Formation and locality. Chemung group ; KelloggsviUe, Ashta- 

 bula county, Ohio. 



Naticopsis cretacea n. sp. 



Shell of medium size, with a depressed spire, consisting of three tt; 

 three and a half volutions, increasing rapidly in size, and angularly 

 rounded on the periphery. Aperture broadly ovate, or patulose, 

 scarcely modified by the preceding volution ; outer lij;) shai'p, entire, 

 somewhat extended on the angle when perfect. Columella thickened, 

 forming a flattened callus which entirely conceals the umbilicus ; suture 

 distinct, not channeled. 



Surface marked by somewhat strong concentric lines of growth, most 

 distinct on the inner volutions. In old specimens, the outer volutions 

 sometimes become slightly depressed just below the suture. 



Internal casts of this species have very low spires, with the volutions 

 subangular on the periphery, and are largely umbilicated from the 

 removal of the heavy callus. 



Formation and locality. In the cherty limestone of the Upper Ilel- 

 derberg group ; near Dublin, Ohio. 



PoRCELLIA SciOTA 71. SJ). ? 



Shell small, discoid, consisting of about thi-ee and a half volutions ; 

 the outer one more rapidly expanding. Ornamented on the dorso- 

 lateral margin, M'ith a series of elongated nodes, and on the sides with 

 a series of undulations, which extend from the base of the node to the 

 inner margin of the volution, and are crossed by two revolving linos of 

 furrows, giving them the character of depressed nodes or tubercles. 



