510 



LAMELLIBRANCHIA TA. 



[SCH. 



davulus, see Sphenotus clavulus. 

 combensis, Walcott, 1885, Monogr. U. S. 



Geo. Sur., vol. 8, p. 175, Devonian, 

 concentricus, Winchell, 1862, (Cardinia 



concentrica,) Proc. Acad. Nat. Sci., p. 



413, Marshall Gr. 

 cylindricus, Winchell, 1863, Proc. Acad. 



Nat. Sci., p. 13, Marshall Gr. 

 ftavius, see Sphenotus flavius. 

 glaucus, see Goniophora glaucus. 

 gracilis, Walcott, 1885, Monogr. U. S. 



Geo. Sur., vol. 8, p. 175, Devonian. 

 hamiltonensis, see Goniophora hamilton- 



ensis. 

 ida, Hall, 1870, Prelim. Notice Lam. 



Shells, p. 43, and Pal. N. Y., vol. 5, pi. 



65, fi<?. 20, Ham. Gr. 

 iowensis, Winchell, 1863, Proc. Acad. 



Nat. Sci., p. 14, Marshall Gr. 

 jejunus, Winchell, 1863, Proc. Acad. Nat. 



Sci., p. 15, Marshall Gr. 

 marshallensis, Winchell, 1862, Proc. Acad. 



Nat. Sci., p. 415, Marshall Gr. 

 missouriensis, Swallow, 1860, (Solen (?) 



missouriensis,) Trans. St. Louis Acad. 



Sci., vol. 1, p. 655, Waverly or Cho- 



teau Gr. 

 multistriatus, Worthen, 1884, Bull. No. 2, 



111. St. Mus. Nat. Hist., p. 14, and Geo. 



Sur. 111., vol. 8, p. 129, Keokuk Gr. 

 naenia, Walcott, 1885, Monogr. U. S. Geo. 



Sur., vol. 8, p. 249, Subcarboni ferous. 

 naiadiformis, Winchell, 1870, Proc. Am. 



Phil. Soc., vol. 12, p. 255, Marshall Gr. 

 nasutus, Meek, 1871, Am. Jour. Conch., 



vol. 7, Kinderhook Gr. 

 obliquus, Meek, 1871, Proc. Acad. Nat, 



Sci., p. 213, and Ohio Pal. vol. 2, p. 306, 



Waverly Gr. 



perangulatus, see Goniophora perangulata. 

 ponderosus, see Modiomorpha ponderosa. 

 randolphensis, Worthen, 1883, (Cypri- 



cardia randolphensis,) Geo. Sur. 111., 



vol. 7, p. 326, Kaskaskia Gr. 

 retusus, Walcott, 1885, Monogr. U. S. Geo. 



Sur., vol. 8, p. 247, Subcarboniferous. 

 salteri, Walcott, 1885, Monogr. U. S. Geo. 



Sur., vol. 8, p. 248, Subcarboniferous. 

 sanduskiensis, Meek, 1871, Proc. Acad. 



Nat, Sci., p. 68, and Ohio Pal., vol. 1, p. 



209, Up. Held. Gr. 

 securis, Wim-hell, 1870, Proc. Am. Phil. 



Soc., vol. 12, p. 255, Marshall Gr. 

 simplex, Walcott, 1885, Monogr. U. S. Geo. 



Sur., vol. 8, p. 248, Subcarboniferous. 

 solenoides, see Sphenotus solenoides.* 

 striatus, Walcott, 1885, Monogr. II. S. Geo. 



Sur., vol. 8, p. 249, Subcarboniferous. 

 strigatus, Winchell, 1865, Proc. Acad. Nat. 



Sci., p. 127, Marshall Gr. 

 subtortuosns, see Sphenotus subtortuosus. 

 subtruncatus, Hall, 1885, Pal. N. Y., vol. 



5, p. 508, Chemung Gr. 

 sulciftrus, see Cypricardinia sulcifera. 

 tethys, Billings, 1874, Pal. Foss., vol. 2, p. 



50, Gaspe limestone No. 8, Devonian, 

 undatus, Hall, 1870, Prelim. Notice Lam. 



Shells, p. 41, and Pal. N. Y., vol. 5, pi. 



80, figs. 5, 6, Chemung Gr. 



unioniformis, Winchell, 1862, Proc. Acad. 

 Nat. Sci., p. 414, Marshall Gr. 



valvulm, see Sphenotus valvulus. 

 SCHIZODUS, King, 1844, Ann. Mag. Nat. Hist., 

 vol. 14, p. 313. [Ety. schizo, I split; 

 odous, a tooth.] Shell oval or subtrig- 

 onal; anterior side rounded, shorter 

 than the other ; posterior side tapering, 

 truncate at the extremity, umbonal 

 ridge extending to the postero-basal re- 

 gion ; beaks prominent; surface smooth 

 or with concentric stria?; hinge with 

 two smooth cardinal teeth in the 

 right valve and three in the left ; mid- 

 dle tooth of the left valve bifi-l, and fit- 

 ting between two of the right valve ; 

 free margins smooth. Type S. truncatus. 



sequalis, Hall, 1885, Pal. "N. Y., vol. 5, p. 

 459, Waverly Gr. 



amplus, Meek & Worthen, 1870, Proc. 

 Acad. Nat. Sci. Phil., p. 41, and Geo. 

 Sur. 111., vol. 5, p. 579, Coal Meas. 



cayuga, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 95, syn. for Cytherodon ap- 

 pressus. 



chesterensis, Meek 

 & Worthen, 1865, 

 Proc. Acad. Nat. 

 Sci. Phil., p. 457, 

 and Geo. Sur. 111., 

 vol. 2, p. 301, Kas- 

 kaskia Gr. 



circulus, Worthen, FlG 9U j._ Sch | ZO dus 

 1884, Bull. No. 2, medinensis. 



III. St. Mus. Nat. 



Hist, p. 11, and Geo. Sur. 111., vol. 8, 

 p. 109, St. Louis Gr. 



contractus, Hall, 1885, Pal. N. Y., vol. 5, 

 p. 451, Ham. Gr. 



cuneatus, Meek, 1875, Ohio Pal., vol. 2, p. 

 336, Coal Meas. 



curtiformis, Walcott, 1885, Monogr. U. S. 

 Geo. Sur., vol. 8, p. 253, Subcarbonif- 

 erous. 



curtus, Meek & Worthen, 1866, Proc. Chi. 

 Acad. Sci., p. 18, Coal Meas. 



degener, Hall, 1885, Pal. N. Y. vol. 5, p. 



456, Chemung Gr. 



deparcus, Walcott, 1885, Monogr. U. S. 

 Geo. Sur., vol. 8, p. 252, Subcarbonif- 

 erous. 



depressus, Worthen, 1884, Bull. No. 2, 111. 

 St. Mus. Nat. Hist, p. 11, and Geo. Sur. 

 111., vol. 8, p. 109, St. Louis Gr. 



ellipticus, see Cytherodon ellipticus. 



eminens, Hall, 1885, Pal. N. Y., vol. 5, p. 



457, Chemung Gr. 



gregarius, see Cytherodon 



gregarius. 



inagnus, Worthen, 1884, 

 Bull. No. 2, 111. St. 

 Mus. Nat. Hist., p. 9, 

 and Geo. Sur. 111., vol. 

 8, p. 107, Kaskaskia Gr. 

 medinensis, Meek, 1871, 

 Proc. Acad. Nat. Sci. Phil., vol. 23, p. 

 165, and Ohio Pal., vol. 2, p. 299, Wa- 

 verly Gr. 



FIG. 917. Hinge 

 of Scliizodus 

 truncatus. 



