BIBLIOGEAPHIC LIST OF GENERA AND SPECIES. 897 



ORTHIS SOLA Billings. See Rhipidomella sola. 

 ORTHIS STONENSIS Safford. See Pianodema stonensis. 

 ORTHIS STRIATELLA Dalman. See Chonetes stria tellus. 

 ORTHIS STRIATULA Emmons. See Dalmanella testudinaria. 

 ORTHIS SUB^EQUATA Conrad. See Pianodema subaequata. 

 ORTHIS SUB^QUATA Billings. See Hebertella vulgaris. 



ORTHIS (DALMANELLA) SUB^EQUATA CIRCULARIS Winchell and Schuchert. See Pia- 

 nodema subsequata circularis. 



ORTHIS (DALMANELLA) SUB^QUATA CONRADI Winchell. See Pianodema subaequata 

 conradi. 



ORTHIS (DALMANELLA) SUBAEQUATA var. GIBBOSA Winchell and Schuchert. See 

 Pianodema subaequata gibbosa. 



ORTHIS (DALMANELLA) SUB^QUATA var. PERVETA Winchell and Schuchert. See 

 Pianodema subsequata perveta. 



ORTHIS SUBCIRCULA Simpson. See Rhipidomella subcircula. 

 ORTHIS SUBJUGATA Hall. See Hebertella subjugata. 



Orthls(?) subnodosa Hall. 



Orthis subnodosa Hall, Desc. New sp. Fossils from Waldron, Indiana, 1879, p. 14; 

 llth Rep. State Geol. Indiana, 1882, p. 286, pi. 27, fig. 17; Trans. Albany Inst., 

 10, 1883, p. 70. Nettelroth, Kentucky Fossil Shells, Mem. Geol. Surv. Ken- 

 tucky, 1889, p. 44. Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 535, 

 figs. Kindle and Breger, Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1904, p, 

 433, pi. 2, fig. 7. 



Niagaran: Waldron, Indiana (Waldron); Louisville, Kentucky; Carroll County, 

 Indiana. 



ORTHIS SUBQUADRATA Hall. See Dinorthis (Plsesiomys) subquadrata. 

 ORTHIS SWEENEYI Winchell. See Dinorthis pectinella sweeneyi. 



Orthis(?) tenuidens Hall. 



Orthis tenuidens Hall, Pal. New York, 2, 1852, p. 58, pi. 20, fig. 9. 

 Clinton: Oneida County, New York. 



ORTHIS TERSUS Sardeson. See Dalmanella tersa. 



ORTHIS TESTUDINARIA of authors. See Dalmanella testudinaria, D. fertilis, D. rogata, 

 and Orthis tricenaria. 



ORTHIS (DALMANELLA) TESTUDINARIA var. EMACERATA Winchell and Schuchert. See 

 Dalmanella macrior. 



ORTHIS (DALMANELLA) TESTIJDINARIA var. MEEKI Winchell and Schuchert. See 

 Dalmanella corpulenta. 



Orthis tricenaria Conrad. 



Orthis tricenaria Conrad, Proc. Acad. Nat. Sci. Philadelphia, 1, 1843, p. 333. 

 Hall, Pal. New York, 1, 1847, p. 121, pi. 32, fig. 8. Emmons, Amer. Geology, 

 1, pt. 2, 1855, p. 193, pi. 9, fig. 8. Salter, Can. Org. Rem., 1, Geol. Surv. 



