454 



CEPHAL OPODA. 



[SPI. TRE. 



capax, Meek & Worthen, 1865, (Crypto- 

 ceras capax,) Proc. Acad. Nat. Sci. 

 Phil., p. 262, and Geo. Sur. III., vol. 6, 

 p. 532, Coal Meas. 



collectum, Meek & Worthen, 1870, Proc. 

 Acad. Nat. Sci. Phil., p. 48, and Geo. 

 Sur. 111., vol. 5, p. 544, St. Louis Gr. 



indianense, Worthen, (in press,) Geo. 

 Sur. 111., vol. 8, p. 150, St. Louis Gr. 



leidyi, Meek & Worthen, 1865, (Nautilus 

 leidyi,) Proc. Acad. Nat. Sci. Phil., p. 

 262, and Geo. Sur. 111., vol. 5, p. 524, 

 Keokuk Gr. 



springeri, White & St. John, 1868, (Nau- 

 tilus springeri,) Trans. Chi. Acad. Sci., 

 vol. 1, p. 124, Up. Coal Meas. 

 Spirula, Lamarck, 1801, Syst. An. sans Vert. 



mortoni, Troost, 1840, 5th Geo. Rep. Tenn., 



Niagara Gr. Not clearly denned. 

 STREPTOCBRAS, Billings, 1866, Catal. Sil. 

 Foss. Antic., p. 88. [Ety. streptos, t\\ isted ; 

 keras, horn.] Having the general lorm 

 of Oncoceras, but with a trilobed aper- 

 ture resembling Phragmoceras. Type 

 S. janus. 



heros, Billings, 1866, Catal. Sil. Foss. 

 Antic., p. 89, Niagara Gr. 



janus, Billings, 1866, Catal. Sil. Foss. 

 Antic., p. 88, Niagara Gr. 



FIG. 760. Aperture of Streptoceras janus. 



TEMNOCHILUS, McCoy, 1844, Synop. Garb. 

 Foss. Ireland, p. 20. [Ety. temno, I di- 

 vide; cheilos, lip.] Nautiloid in form, 

 and characterized by a broad, deep, 

 open umbilicus, showing all the volu- 

 tions, with the outer side of the volu- 

 tions broad or flattened, and the middle 

 of each lateral margin prominently angu- 

 lar ; the angle being sometimes nodose, 

 while the transverse diameter of the 

 volutions is always greater than the 

 dorso-ventral ; siphuncle between the 

 middle and the outer side of the whorls. 

 Type T. biangulatus. 



coxanum, Meek & Worthen, 1869, Proc. 

 Acad. Nat. Sci. Phil., p. 50, and Geo. 

 Sur. 111., vol. 5, p. 543, St. Louis Gr. 



latnm, Meek & Worthen, 1870, Proc. Acad. 

 Nat. Sci. Phil., p. 49, and Geo. Sur. 111., 

 vol. 5, p. 608, Coal Meas. 



niotense, Meek & Worthen, 1865, Proc. 

 Acad. Nat. Sci. Phil., p. 260, and Geo. 

 Sur. 111., vol. 5, p. 523, Keokuk Gr. 

 Type of Hyatt's genus Edaphoceras. 



FIG. 761. Temnochilus coxanum. 



peramplum, Meek & Worthen, 1865, 

 (Endolobus peramplus,) Proc. Acad. 

 Nat. Sci. Phil., p. 259, Kaskas- 

 kia Gr. 



scottense, Worthen, (in press.) Geo. Sur. 

 111., vol. 8, p. 151, Warsaw Gr. 



spectabile, Meek & Worthen, 1860, (Nau- 

 tilus spectabilis, ) Proc. Acad. Nat. Sci. 

 Phil., p. 469, and Geo. Sur. 111., vol. 2, 

 p. 308, Kaskaskia Gr. 



winslowi, Meek & Worthen, 1870, Proc. 

 Acad. Nat. Sci. Phil., p. 50, and Geo. 

 Sur. 111., vol. 5, p. 609, Coal Meas. 

 TERATICHNUS, S. A. Miller, 1880, Jour. Cin. 

 Soc. Nat. Hist., vol. 2, p. 221. [Ety. 

 leras, a wonder ; ichnos, track.] A track 

 supposed to have been made by a 

 cephalopod, and consisting of numer- 

 ous elongated, more or less bifurcated 

 impressions. Type T. confertus. 



confertus, S. A. Miller, 1880, Jour. Cin. 

 Soc. Nat. Hist., voL 2, p. 221, Utica 

 Slate Gr. 



TRACHOMATICHNUS, S. A. Miller, 1880, Jour. 

 Cin. Soc. Nat. Hist., vol. 2, p. 219. 

 [Ety. trachoma, that which is made 

 rough; ichnos, track.] A track sup- 

 posed to have been made by a cephal- 

 opod and consisting of numerous sim- 

 ple or compound impressions arranged 

 in two series. Type T. numerosus. 



cincinnatiensis, S. A. Miller, 1880, Jour. 

 Cin. Soc. Nat. Hist., vol. 2, p. 220, 

 Utica Slate Gr. 



numerosus, S. A. Miller, 1880, Jour. 

 Cin. Soc. Nat. Hist., vol. 2, p. 219, 

 Utica Slate Gr. 



permultus, S. A. Miller, 1880, Jour. Cin. 

 Soc. Nat. Hist., vol. 2, p. 220, Utica 

 Slate Gr. 



TREMATOCERAS, Whitfield, 1882, Ann. N. Y. 

 Acad. Sci., vol. 2, p. 205. [Ety. trema, 



