40 BRACHIOPODS. 



Discina newberryi. HALL. 



Discina newberryi Hall, 1864: Sixteenth Rep. Reg. State Cab. Nat. Hist. 



New York, p. 30. 

 Discina newberryi Hall, 1869: Pal. New York, vol. LV, p. 25, pi. i, figs. 



10-11. 

 Discina newberryi Meek, 1875 ; Geol. Sur. Ohio, Pal , vol. II, p. 277, pi. 



xiv, figs. la-d. 

 Discina sampsoni Miller, 1892: Geol. Sur. Indiana, 17th Ann. Rep., p. 80, 



pi. xiii, figs. 10-12. 



Similar to D. nitida, but higher, and with the apex submar- 

 ginal. 



Horizon and localities. Lower Carboniferous, Kinderhook 

 beds : Sedalia, Springfield, Louisiana. 



Discina convexa SHUMARD. 



Plate xxxv, flg. 7. 



Discina convexa Shumard, 1858 : Trans. St. Louis Acad. Set, vol. I, p. 221. 

 Discina convexa White, 1884: Geol. Sur. Indiana, 13th A.nn. Rep., pt. ii, 

 p. 121, pi. xxv, fig. 9. 



Like D. nitida but very much larger; often reaching a 

 diametric measurement of nearly an inch. 



Horizon and localities, Upper Carboniferous, Upper Coal 

 Measures : near Richmond (Ray county). 



Crania laevisSp. nov. 



Shell rather above medium size, somewhat depressed ; apex 

 subcentral; margins regularly rounded except on one side, 

 which is truncated. Muscular scars prominent. Surface 

 marked by concentric lines of growth. 



Horizon and localiti**. Lower Carboniferous, Chouteau 

 (Kinderhook) limestone: Louisiana; and Burlington lime- 

 stone: Louisiana. 



Productus arcuatus HALL. 



Productus arcuatus Hall, 1858 : Geology Iowa, vol. I, p. 513, pi. vii, figs. 



4a-b. 

 Productus cooperensis Swallow, 1860: Trans. St. Louis Acad. Sci., vol. I, 



p. 640. 



Shell small, with the ventral valve very long and arched, 

 the hinge line short ; surface marked by broad rounded radiat- 

 ing ridges, which are crossed by fine concentric lines. 



