232 CATALOGUE OF THE CRETACEOUS AND f bull. 152. 
Thyrsopteris sphenopteroides Font. Potomac Fl., p. 143, pi. lviii, 
f. 6, 1889. 
Potomac formation : Near Potomac Run, Virginia. 
Thyrsopteris squarrosa Font. Potomac Fl., p. 143, pi. lix, f. 3, 1889. 
Potomac formation : Near Potomac Run and Telegraph Station, 
Virginia. 
Thyrsopteris varians Font. Potomac Fl., p. 137, pi. lii, f. 2-4; liii, 
f. 1-3; liv, f. 10; lvii, f. 2, 1889. 
Potomac formation : Fredericksburg, Virginia. 
Thyrsopteris virginica Font. Potomac Fl., p. 120, pi. xxiv, f. 1, 1889. 
Potomac formation: Near Potomac Run, Virginia. 
TILIA (Tournefort) Liunreus. Syst., ed. i, 1735. 
Tilia alaskana Heer. Fl. Foss. Alask., p. 36, pi. x, f. 2, 3, 1869. 
Eocene?: Port Graham, Alaska. 
Tilia antiqua Newby.= Viburnum antiquum. 
Tilia populifolia Lx. Oret. and Tert. FL, p. 179, pi. xxxiv, f. 8, 9, 
1883. 
Green River group : Florissant, Colorado. 
TILX-SFHYLLI7M Newberry. Fl. Amboy Clays, p. 109, 1896. 
Telisephyllum dubium Newby. Fl. Amboy Clays, p. 109, pi. xv, f. 5, 
1895 [1896]. 
Amboy clay: Fish House. 
TMESIPTERIS Bernhardt In Schrad. Journ., vol. ii, p. 131, 1800. 
Tmesipteris Alleni (Lx.) Hollick, Bull. Torr. Bot. Club, vol. xxi, 
p. 256, pi. ccv, f. 12, 1894, 
Salvinia Alleni Lx. Tert. FL, p. 65, pi. v, f. 11, 1878. 
Ophioglossum Alleni Lx. Ann. Rept. U. S. Geol. and Geogr. Snrv. Terr., p. 371, 
1872 [1873]. 
Green River group : South Park, Colorado. 
Todia? Saportanea Lx. = Lomatia? Saportanea. 
Torreya Arnott, 1838 = Tumion Rafinesque, 1840. 
Torreya densifolia Dn.= Tumion densifolium. 
Torreya dicksonioides Dnl= Tumion dicksonioides. 
Torreya falcata Font.= Tumion falcatum. 
Torreya oblanceolata Lx.= Tumion oblanceolatum. 
Torreya virginica Font.= Tumion virginicum. 
TOXYLON Rafinesque. In Am. Month. Mag., vol. ii, p. 18, 1817. 
Toxylon pomiferum Raf. 
Maclura auriantiaca Nntt. Penhallow in Coleman, Jonrn. Geol., vol. iii, 
p. 635, 1895; Trans. Roy. Soc. Canada, 2d ser., vol. ii, sec. iv, p. 69, 72, 1896. 
Pleistocene: Don River, Canada. 
TRAPA Linnams. Gen. PI., ed. i, p. 359, 1737. 
Trapa americana Kn. Eighteenth Ann. Rept. U. S. Geol. Surv., 
pt. iii, p. 733, pi. cii, f. la, 1898. 
Payette formation : Idaho City, Idaho. 
