1310 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Turritoma acrea (Billings). 



Murchisonia acrea Billings, Pal. Foss., 1, Geol. Surv. Canada, 3865, p. 232, fig. 



216. 



Turritoma acrea Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 959 (gen. ref.). 

 Canadian (Quebec G): Port aux Choix, Newfoundland. 



Turritoina ada (Billings). 



Murchisonia Ada Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 346, fig. 333. 

 Turritoma ada Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 959 (gen. ref). 

 Canadian (Beckmantown) : Leeds and Grenville Counties, Canada. 



Turritoma boylci (Nicholson). 



Murchisonia Boylei Nicholson, Rep. Pal. Prov. Ontario, pt. 2, 1875, p. 71, pi. 3, 

 fig. 1. Whiteaves, Pal. Foss., Geol. Surv. Canada, 3, pt. 2, 1895, p. 81. 

 Nicholson, Quart. Jour. Geol. Soc. London, 31, 1875, p. 547, pi. 26, fig. 1. 



Turritoma boylei Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 959 (gen. ref.). 



Hormotoma? Boylei Donald, Quart. Jour. Geol. Soc. London, 55, 1899, p. 263 (gen. 

 ref.). . 



Niagaran (Guelph) : Elora, Ontario. 



Turritoma constricta (Whiteaves). 



Murchisonia constricta Whiteaves, Pal. Foss., Geol. Surv. Canada, 3, pt. 1, 1884, 



p. 25, pi. 4, fig. 4; pt. 2, 1895, p. 82 (loc. occ.). 



Turritoma constricta Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 959 (gen. ref.). 

 Niagaran (Guelph): Durham, Ontario. 



Turritoma laphami (Hall). 



Murchisonia laphami Hall, Rep. Sup. Geol. Surv. Wisconsin, 1, 1861, p. 36; 20th 



Rep. New York State Cab. Nat. Hist., 1868, p. 366, pi. 16 (6), fig. 20; rev. 



ed., 1870, p. 396, pi. 15, fig. 20. 



Turritoma laphami Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 959 (gen. ref.). 

 Murchisonia (Turritoma) laphami Kindle and Breger, 28th Ann. Rep. Dep. Geol. 



Nat. Res. Indiana, 1904, p. 461, pi. 13, fig. 7. 

 Niagaran: Racine, Wisconsin (Racine); Huntington, Indiana. 

 Plesiotype.Cat. No. 52942, U.S.N.M. 



TURRITOSPIRA Ulrich. See Turritoma Ulrich. 



TYLOPTERUS Clarke and Ruedemann. See Eurypterus subgentis Tylopterus. 



TTRRELLIA Parks. Genotype: T. severnensis Parks. 



Tyrrellia Parks in Tyrrell, 22d Rep. Ontario Bur. Mines, 1913, p. 35. 



Tyrrellia severnensis Parks. 



Tyrrellia severnensis Parks in Tyrrell, 22d Rep. Ontario Bur. Mines, 1913, p. 35. 

 Niagaran (Guelph): Severn River, Ontario. 



ULRICHIA Jones. Genotype: U. conradi Jones. 



Ulrichia Jones, Quart. Jour. Geol. Soc. London, 46, 1890, p. 543; 49, 1893, p. 293. 



Ulrich, Jour. Cincinnati Soc. Nat. Hist., 13, 1891, p. 203. Miller, N. A. Geol. 



Pal., 1st App., 1892, p. 711. Bonnema, Mitt. Min. Geol. Inst. Groningen, 2, 



1909, p. 51. Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 346. 



Ulrichia biyertex (Ulrich). 



Leperditia bivertex Ulrich, Jour. Cincinnati Soc. Nat. Hist., 2, 1879, p. 11, pi. 7, 

 figs. 5, 5a. 



