434 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Didymograptus nitidus grandis Ruedemann. 



Didymograptus nitidus var. grandis Ruedemann, Mem. New York State Mus., 7, 



pt. 1, 1904, p. 674, pi. 13, fig. 5. 

 Canadian (Deepkill, Tetragraptus zone): DeepkilJ, Rensselaer County New York. 



Didymograptus patulus (Hall). 



Graptolithus patulus Hall, Geol. Surv. Can., Rep. for 1857, 1858, p. 131; Can. Nat. 

 andGeol., 3, 1858, p. 165; Geol. Surv. Canada, Canadian Org. Rem., dec. 2, 

 1865, p. 71, pi. 1, figs. 10-15. 



Didymograptus patulus Hopkinson, Quar. Jour. Geol. Soc., 31, 1875, 644, pi. 33, 

 figs. 4a-e. Linnarsson, Sver. Geol. Und. Afh. och Upps., ser. C, No. 31, 1879, 

 p. 5. Brogger, Die sil. Etagen 2, 3, Kristiania, 1882, p. 39. Herrmann (part.), 

 Geol. Mag., dec. 3, 3, 1886, p. 14. Matthew, Proc. and Trans. Royal Soc. Can., 

 10, sec. 4, 1893, p. 98; ibid., 11, 1894, p. 114. Elles and Wood, Mon. British 

 Grapt., pt. 1, Pal. Soc., 1901, p. 13, pi. 1, figs. 8a-c; text figs. 8a-b. Ruede- 

 mann, New York State Pal. Ann. Rep., 1902, p. 556; Mem. New York State 

 Mus., 7, pt. 1, 1904, pp. 674-676, pi. 13, figs. 8, 9; pi. 14, fig. 7; text figs. 

 71-73 (73 on p. 677). Grabau and Shimer, N. A. Index Fossils, 1, 1906, p. 31, 

 figs. 47b, 49b. 



Canadian: Point Levis, Quebec (Levis); St. John, New Brunswick (Bretonian 

 Div. C3d); Deepkill, Rensselaer County, New York (Deepkill, Tetragraptua 

 zone). 



Didymograptus pennatulus (Hall). 



Graptolithus pennatulus Hall, Geol. Surv. Canada, dec. 2, 1865, p. 7, fig. 1; p. 82, 



pi. 3, figs. 1-8; pi. 5, fig. 9. 

 Graptolithus (Didymograptus) pennatulus Hall, 20th Rep. New York State Cab. 



Nat. Hist., 1868, p. 173, fig. 2; rev. ed., 1870, p, 206. fig. 2. 

 Graptolithus ((Monoprion) pennatulus Hall, 20th Rep. New York State Cab. 



Nat. Hist., 1868, p. 223. 

 Didymograptus pennatulus Hopkinson, Quart. Jour. Geol. Soc. London, 31, 1875, 



p. 643, pi. 33, figs. 3a-3e. Zittel, Handb. Pal., 1, 1879, p. 298, fig. 204. 



Barrois, Ann. Soc. Geol. du Nord, 20, 1892, p. 90. Elles and Wood, Mon. 



British Grapt., Pal. Soc., 1901, p. 18, pi. 1, fig. 7. 



Didymograpsus pennatulus Gurley, Jour. Geol., 4, 1896, p. 97 (gen. ref.). 

 Canadian: Point Levis, Quebec (Levis, Didymograptus zone); England (Arenig). 



Didymograptus perflexus Gurley. 



Didymograpsus perflexus Gurley, Jour. Geol., 4, 1896, p. 66. 

 Canadian: Summit, Nevada. 

 Cotypes.C&t. No. 54344, U.S.N.M. 



DIDYMOGRAPTUS RECTUS Ruedemann. See Monograpsus rectus. 

 DIDYMOGRAPTUS SAGITTARIUS Dale. See Didymograptus sagitticaulis. 



Didymograptus sagitticaulis Gurley. 



Graptolithus Sagittarius Hall (not Hisinger), Pal. New York, 1, 1847, p. 272, pi. 74, 

 fig. 1. Chapman, Canadian Jour., n. s., 1, 1856, p. 390, fig. 6. Walcott, 

 Trans. Albany Inst., 10, 1883 (adv. sheet, 1879, p. 34). 



Monograptus Sagittarius Whitfield, Am. Jour. Sci., 3d ser., 26, 1883, p. 380. 



Didymograptus Sagittarius Lapworth, Trans. Roy. Soc. Canada, 5, see. 4, 1886, p. 

 180f, 183f; Geol. Surv. Canada Ann. Rep., 2d ser., 3, pt. 1, 1889, p. 95B. 

 Walcott, Bull. Geol. Soc. Amer., 1, 1890, p. 338. Gurley, Geol. Surv. Arkan- 

 sas, Ann. Rep., 3, p. 411. Dale, Bull. U. S* Geol. Surv., 242, 1904, p. 33. 



Didymograpsus sagitticaulis Gurley, Jour. Geol., 4, 1896, p. 68. 



