BIBLIOGRAPHIC LIST OF GENERA AND SPECIES'. 1267 



Tetragraptus alatus (Hall). 



Graptolithus alatus Hall, Canadian Nat. Geol., 3, 1858, p. 162; Geol. Surv. Canada, 



Rep. Progr. for 1857, 1858, p. 128; Geol. Stirv. Canada, dec. 2, 1865, p. 93, pi. 



6, fig. 9. 

 Tetragraptus (Graptolithus) alatus Nicholson, Mon. British Grapt., 1872, p. 67, 



fig. 37. 

 Canadian (Levis): Point Levis, Quebec. 



Tetragraptus amii (Lapworth). 



Graptolithus bryonoides Hall (part), Geol. Surv. Canada, dec. ] , 1865, p. 84, pi. 4, 



figs. 9, 10. 

 Tetegraptus amii (Lapworth MS.), Elles and Wood, Mon. British Grapt., pt. 1, 



Pal. Soc, 1902, p. 60, pi. 5, figs. 4a-c, fig. 36. — Ruedemann, Mem. New York 



State Mus., 7, pt. 1, 1904, pp. 647-649, pi. 11, figs. 5-7, figs. 53, 54. 

 Canadian: Point Levis, Quebec (Levis, Diplograptus dentatus zone); Deepkill, 



Rensselaer County, New York (Deepkill, Tetragraptus zone) ; Arkansas ; South 



Wales (Skiddaw). 



Tetragraptus approximatus (Nicholson). 



Tetragrapsus approximatus Nicholson, Ann. Mag. Nat. Hist., 4th ser., 11, 1873, p. 



136, fig. 2. 

 Canadian: Point Levis, Quebec (Levis, Clonograptus zone) ; Arkansas. 



Tetragraptus bigsbyi of authors. See Tetragraptus similis, T. woodi, and T. pyg- 

 maeus. 



Tetragraptus bryonoides Hall. See Didymograptus(Isograptus)caduceus, Tetra- 

 graptus serra, and T. similis. 



Tetragraptus caduceus Brogger. See Didymograptus (Isograptus) caduceus and 

 Tetragraptus similis. 



Tetragraptus clarkei Ruedemann. 



Tetragraptus fruticosus mut. (part) Ruedemann, New York State Pal., Ann. Rep., 



1902, p. 566. 

 Tetragraptus clarkei Ruedemann, Mem. New York State Mus., 7, pt. 1, 1904, 



pp. 652, 653, pi. 11, figs. 11-16. 

 Canadian: Deepkill, Rensselaer County, New York (Deepkill, Didymograptus 



bifidus zone); Arkansas. 



Tetragraptus crucifer (Hall). 



Graptolithus crucifer Hall, Geol. Surv. Canada, Rep. Progr. for L857, 1858, p. 125; 



Canadian Nat. Geol., 3, 1858, p. 149; Geol. Surv. Canada, dec. 2, 1865, p. 92, 



pi. 5, figs. 10, 13 (?pl. 6, fig. 7). 

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



1868, p. 226; rev. ed., 1870, p. 260; p. 223. 

 Tetragrapsus crucifer Nicholson, Quart. Jour. Geol. Soc. London, 24, 1868, p. 111. 

 Tetragraptus crucifer Klles, Quart. Jour. Geol. Soc. London, 54, 1898, p. 488, fig. 



12.— Elles and Wood, Mon. British Grapt., Pal. Soc, 1902, p. 58, pi. 5, fig. 2. 

 Canadian (Levis): Point Levis, Quebec; Skiddaw slate of England. 



Tetragraptus denticulatus (Hall). 



Graptolithus denticulatus Hall, Geol. Surv. Canada, Rep. Progress for 1857, 1858, 



p. 132; Canadian Nat. Geol., 3, 1858, p. 100; Geol. Surv. Canada, dec. 2, 1865, 



p. 88, pi. 4, figs. 12-16. 

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



Hist., 1868, p. 226; rev. ed., 1870, p. 260. 



