294 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Cryptograptus tricornis (Carruthers). 



Diplograptus tricornis Carruthers, Trans. Royal Phys. Soc. Edinburgh, 1, 1858, 



p. 468, fig. 2; Ann. Mag. Nat. Hist., 3, 1859, p. 25, fig. 2; Geol. Mag., 5, 



1868, p. 131, fig. 11. Hopkinson and Lapworth, Quart. Jour. Geol. Soc. 



London, 31, 1875, p. 658, fig. 6. Lapworth, Cat. West Scott. FOBS., 1876, 



fig. 30; Rep. and Proc. Belfast Nat. Field Club, 2d ser., 1, pt. 4, app., 1877, 



p. 132, pi. 6, fig. 10. Ami, Rep. Geol. Surv. Canada, 2d ser., 3, pt. 2, 1889, 



pp. 50K, 117K. 

 Cryptograptus tricornis Lapworth, Ann. Mag. Nat. Hist., 5th ser., 5, 1880, p. 171, 



pi. 5, figs. 27a-27e; Proc. and Trans. Royal Soc. Canada, 4, 1887, p. 177; 



Science, 9, 1887, p. 320; Canadian Rec. Sci., 3, 1888, p. 141; Rep. Geol. 



Surv. Canada, 2d ser., 3, pt. 1, 1889, p. 95B. Gurley, Jour. Geol., 4, 1896, 



p. 298. Elles, Quart. Jour. Geol. Soc. London, 54, 1898, p. 527. Hall, Proc. 



Royal Soc. Victoria, 18, pt. 1, 1905, p. 21. Ami, Geol. Surv. Canada, Sum. 



Rep. for 1904, 1905, p. 12. Hall, Rec. Geol. Surv. Victoria, 1, pt. 4, 1906, 



p. 275. Ruedemann, Mem. New York State Mus., 11, pt. 2, 1908, pp. 443 



448, pi. 28, figs. 1-4; figs. 410-417. 

 Cryptograptus (Idiograptus) tricornis, Perner, Etudes sur les Grapt. Boherae, pt. 



2, 1895, p. 26, pi. 7, figs. 7-10. 



Diplograptus etheridgii Hopkinson, Geol. Mag., 9, 1872, p. 504, fig. 5. 

 Graptolithus marcidus Hall, Pal. New York, 3, 1859, p. 515, figs. 1-3; 13th Ann. 



Rep. New York State Cab. Nat. Hist., 1860, pp. 58, 59, figs. 1-3. 

 Diplograptus marcidus Walcott, Trans. Albany Inst., 10, 1883 (adv. sheet 1879, 



p. 34). Whitfield, Amer. Jour. Sci., 3d ser., 26, 1883, p. 380. Walcott, Bull. 



Geol. Soc. Amer., 1, 1890, p. 339. 



Cryptograptus marcidus Dodge, Amer. Jour. Sci., 3d ser., 40, 1890, p. 153. 

 Middle Ordovician: South Scotland (Glenkiln and Hartfell); New York slate belt 



(Normanskill) ; Canada; Tennessee; Arkansas; Australia; Bohemia; etc. 



Cryptograptus tricornis insectiformis Ruedemann. 



Cryptograptus tricornis mut. insectiformis Ruedemann, Mem. New York State 



Mus., 11, pt. 2, 1908, pp. 448, 449, pi. 28, figs. 5, 419-422. 

 Trenton (Snake Hill): Van Schaick Island, Cohoes, New York 



CRYPTOLITHUS Green. Genotype: C. tesselatus Green. 



Cryptolithus Green, Mon. Tril. N. Amer., 1832, p. 72. Goldfuss, Neues Jahrb. f. 

 Min., etc., 1843, pp. 540-542. Emmrich, ibid., 1845, p. 44. Hall, Pal. New 

 York, 1, 1847, p. 235, footnote. 



Nuttainia Eaton, Geol. Textb., 2d ed., 1832, p. 33. Oreen, Mon. Tril. N. Amer., 

 1832, p. 88. Hall, Pal. New York, 1, 1847, p. 235, footnote. Reed, Quart. 

 Jour. Geol. Soc. London, 58, 1902, p. 62. 



Trinucleus Murchison, Sil. Syst., 1839, p. 659. Emmons, Nat. Hist. New York, 

 Geol., 2, 1842, p. 115. Salter, Quart. Jour. Geol. Soc. London, 3, 1847, p. 

 251. Hawle and Corda, Abh. d. k. bohm. Gesell. Wiss., 5 (extract), 1847, p. 

 38, pi. 3, fig. 17. Salter, Mem. Geol. Surv. United Kingdom, dec. 7, 1853, 

 pi. 7. McCoy, Brit. Pal. Rocks and Foss., 1854, p. 144. Pictet, Traite de 

 Pal., 2d ed., 2, 1854, p. 508. Emmons, Amer. Geology, 1, pt. 2, 1855, p. 212. 

 Chapman, Canadian Jour., n. s., 1, 1856, p. 273; 8, 1863, p. 28; Expos. Min. Geol. 

 Canada, 1864, p. 136. Miller, Cincinnati Quart. Jour. Sci., 1, 1874, p. 126. 

 Zittel, Handb. Pal., 2, 1885, p. 593 Miller, N. A. Geol. Pal., 1889, p. 568. 

 Beecher, Amer. Jour. Sci., 3d ser., 46, 1893, p. 143. Vogdes, Cal. Acad. Sci., 

 Occ. Pap., 4, 1893, p. 359. Beecher, Amer. Jour. ScL., 3d ser., 49, 1895, p. 

 307; Amer. Geol., 16, 1895, pp. 167, 176. Koken, Die Leitfossilien, Leipzig, 

 1896, p. 15, fig. 9, 1. Beecher, Amer. Jour. Sci., 4th ser., 3, 1897, pp. 105, 

 184, 186, pi. 3, fig. 12. Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 

 258. 



