1 88 1.] The Paleontologist. 41 



panding and flattening very gently upward ; solid, apparently, to the 

 height of about one line, with very fine longitudinal surface striae extend- 

 ing that far. Six or seven rows of oval pores, on the upper part, ar- 

 ranged in an alternating manner between exceedingly delicate raised 

 lines. About eight calices in the space of a line, above the striate base, 

 including interspaces which are equal to the longer diameter of the cells. 

 The upper part is elliptical in transverse section. The fine striae, and 

 raised lines require a good magnifier to be seen, — they are not visible 

 to the naked eye. 



The example used for this description is nearly half an inch long, and 

 from half a line to one line wide above the solid (?) base. 



Found in the upper part of the Cincinnati Group, Clinton county, 

 Ohio. 



GENUS ORTHIS. Dalman. 



Orthis (?) LiNNEYi, sp. nov. Jamcs. 



Shell sub-oval in outline, breadth and length about as 4 to 3 ; cardinal 

 line less than half the broadest part of the shell ; regularly and evenly 

 rounded margin from the terminations of the cardinal line to the front ; 

 cardinal area short and confined to the ventral valve. Umbone of ven- 

 tral valve prominent, shell curving sharply to the beak which projects be- 

 yond that of the other valve and is incurved ; a mesial sinus commencing 

 near the beak, narrow and shallow at first, but widening and deepening to 

 the front margin ; deltidium triagonal, and rather broad. Beak of the 

 dorsal valve projecting very little, if any, beyond the cardinal line, and 

 but slightly incurved ; a mesial elevation commencing rather low at the 

 umbone, but becoming prominent near and at the front; front margin 

 quite sinuous, caused by the mesial sinus of the ventral valve, and the 

 prominent mesial elevation on the dorsal valve. Each valve covered by 

 about 23 rather coarse, simple plications, three of which are in the sinus, 

 and the same number on the mesial elevation. 



This species bears some resemblance to some forms of 0. biforata, 

 var. lynx, Eichwald, but it differs, conspicuously, in the more prominent 

 umbone and projecting beak of the ventral valve, and short cardinal 

 area. 



The two specimens used for this description are about one inch broad, 

 and ^ inch high, very regular and symmetrical in form, showing no marks 

 of distortion. They were found by Mr. W. M. Linney, of Harrods- 

 burg, Ky., in the upper part of the Cincinnati Group, Boyle county, Ky. 

 The specific name is given in honor of the discoverer. 



GENUS STREPTORHYNCHUS. King. 

 Streptorhynchus neglecta, James. 

 StropJiomena neglecta, James (Catalogue of Lower Silurian Fossils, 

 Sept. 1 871). 



Strophomena neglecta^filitexta, Meek (Pal. of O., vol. i., p. 83, 1873.) 

 Shell resupinate ; cardinal line longer than the greatest breadth of the 



