BRACHIOPODS. 67 



Streptorhynchus filitexta (HALL), 



Leptcena filitexta Hall, 1847: Pal. New York, vol. I, p. Ill, pi. xxxiB, 



figs. 3a-f. 

 Strophomena filitexta Hail, 1859: 12th Rep. Reg, State Cab. New York, 



p. 70. 

 Strophomena filitexta Meek, 1873 : Geol. Sur. Ohio, Pal., vol. I, p. 83, pi. 



vi, figs. 5a-d. 



Like 8. planumbonum but longer, and ornamented with 

 much finer radiating lines. 



Horizon and localities. Lower Silurian, Hudson shales: 

 Louisiana. 



Streptorhynchus subplanum (CONRAD). 



Strophomena subplana Conrad, 1842: Jour. Acad. Nat. Sci., Phila., vol. 



VIII, p. 258. 

 Leptcena subplana Hall, 1852: Pal. New York, vol. II, p. 259, pi. liii, 



figs. 8-10. 

 Streptorhynchus subplana Hall, 1863: Trans. Albany Institute, vol. IV, 



p. 226. 

 Streptorhynchus subplana Hall, 1882 : Geol. Sur. Indiana, llth Ann. Rept. 



Somewhat like 8. planumbonum but flat, larger, and with 

 much coarser radiating costse. 



Horizon and localities. Upper Silurian limestone : Gyrene 

 (Pike county). 



Streptorhynchus lens WHITE. 

 Plate xxxix, figs. 2a-b. 



Streptorhynchus lens White, 1862 : Proc. Boston Soc. Nat. Hist., vol. IX, 

 p. 28. 



A small circular form with narrow cardinal areas. 

 Horizon and localities. Lower Carboniferous, Louisiana 

 ( Kinderhook ! ) limestone : Louisiana, Clarksville. 



Streptorhynchus crenistria (PHILLIPS). 

 Plate xxxviii, figs. 8a-h. 



Spirifera crenistria Phillips, 1836: Geol. Yorkshire, vol. II, p. 216, pi. 



ix. fig. 6. 



Producta incurvata Shepard, 1838: Am. Jour. Sci., p. 144, figs. 1, 2, 3. 

 Orthisina crassa Meek & Hay den, 1858: Proc. Acad. Nat. Sci., Phila., 



p. 260. 



Orthis robusta Hall, 1858 : Geol. Iowa, vol. I, p. 713, pi. xxviii, figs. 5a-c. 

 Orthis lasallensis McChesney, 1860: Desc. New Palae. Foss., p. 32. 



