BULLETIN NO. 2. 23 



The only specimen of this pretty shell in the State collection 

 was obtamed from the bituminous shale forming the roof of the 

 (jrreenview coal in Menard county. 



No. 2513 of the Illinois State collection. 



Collector, A. H. Worthen. 



BRACHIOPODA. 



GENUS DISCINA, Lamark. 



DISCINA VARSOVIENSIS. (sp. nOV.) 



Shell of medium size, ovate in outhne, anterior and posterior 

 margins nearly equal m width. The larger or free valve is crushed 

 so that its general form cannot be clearly determined ; its surface 

 however IS ornamented around the borders with ten to twelve or 

 more rather strong and sharp concentric ridges, which become less 

 conspicuous or obsolete towards the apex 



The lower valve is nearly flat and marked around the border 

 by hne concentric ridges rather less conspicuous than those on 

 the other valve, with a long narrow slit or foramen extending 

 from about the center of the valve more than half way to the 

 posterior exiremity, and surrounded by an elevated mar^n 



of the^saml ?? inX'"' '''' ^°'''' ^^^^^ * ^^^^^ ' g^'^^t^st breadth 

 Position and locality: Keokuk limestone, Warsaw 111 

 No. 2.545 of the Illinois State collection. 

 Collector, A. H. Worthen. 



GENUS TEEEBRATULA, Llliwd. 



TEREBRATULA ROWLEYI. (sp. nOV.) 



Shell below the medium size, inequivalve, conical ; ventral valve 

 strongly convex m the middle from the beak to the basal margin 

 and rapidly sloping on either side to the lateral borders. Beak 

 of the ventral valve pointed, slightly recurved, and extending be- 

 yond that of the opposite valve; both valves longer than broad 

 and sinuate m front. Dorsal valve slightly convex at the umbo 

 where a shallow depression commences and widens downward' 

 and at the front occupies nearly the entire width of the valve' 

 Surface smooth or showing only very fine lines of growth 



Length of ventral valve from beak to base .-V inch • Greatest 

 breadth A mch; thickness of the shell with tl/e valves^ un ted 

 about one-third the length from the beak to the front, i inch 



Position and locality;: From a cherty bed near the base of the 

 Burlington limestone, Pike county. Mo. 



No. 2526 of the Illinois State collection. 



Collector, E. E. Eowley. 



