1064 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Pteronltella oblonga Billings. 



Pteronitella oblonga Billings, Pal. Foes., Geol. Surv. Canada, 2, pt. 1, 1874, p. 143, 



pi. 9, fig. 7. 

 Silurian: Arisaig, Nova Scotia. 



Pteronltella tenusta Billings. 



Pteronitella venusta Billings, Pal. Foss., Geol. Surv. Canada, 2, pt. 1, 1874, p. 142, 



pi. 9, figs. 5, 5a. 

 Silurian (Stonehouse): Arisaig, Nova Scotia. 



PTERONITES? SUBPLANA Weller. See Leiopteria subplana. 



PTEROTHECA Salter. Genotype: P. transversa Salter. 



Pterotheca Salter, Rep. British Assoc. Adv. Sci., 1852, p. 61. Miller, N. A. Geol. 



Pal., 1889, p. 392. Koken, Die Leitfossilien, Leipzig, 1896, p. 98. 

 Clioderma Hall, 14th Rep. New York State Cab. Hist., 1861, p. 96. 



Pterotheca anatinlformis (Hall). 



Tellinomya anatiniformis Hall, Pal. New York, 1, 1847, p. 154, pi. 34, fig. 7. 

 Clioderma anatiformis Hall, 14th Rep. New York State Cab. Nat. Hist., 1861, 



p. 98. 



Lyonsia anatiniformis Emmons, Amer. Geology, 1, pt. 2, 1855, p. 170. 

 Pterotheca anatiniformis Miller, N. A. Geol. Pal., 1889, p. 393 (gen. ref.). 

 Trenton: Watertown, New York. 



Pterotheca attenuata (Hall). 



Clioderma attenuata Hall, 14th Rep. New York State Cab. Nat. Hist., 1861, p. 98. 

 Pterotheca attenuata Hall, Rep. Geol. Surv. Wisconsin, 1, 1862, p. 40, fig. 2. 



Chamberlin, Geol. Wisconsin, 1, 1883, p. 158, fig. Foerste, Bull. Sci. Lab. 



Denison Univ., 17, 1914, p. 312, pi. 11, fig. 3. 

 Black River: Wisconsin (Platteville); La Cloche Peninsula, Ontario (Lowville). 



Pterotheca canaliculata (Hall). 



Clioderma canaliculata Hall, 14th Rep. New York State Cab. Nat. Hist., 1861, p. 97. 

 Pterotheca canaliculata Miller, N. A. Geol. Pal., 1889, p. 392 (gen. ref.). 

 Trenton: Middleville, New York. 



Pterotheca expansa (Emmons). 



Delthyris expansus Emmons, Geol. New York, 2, 1842, p. 397, fig. 2, figs. 109- 



112. Owen, Amer, Jour. Sci. Arts, 47, 1844, p. 368, fig. 2; Geol. Expl. Iowa, 



Wisconsin, Illinois, 2d ed., 1844, p. 84, pi. 17, fig. 14. 



Clioderma expansa Hall, 14th Rep. .New York State Cab. Nat. Hist., 1861, p. 98. 

 Pterotheca expansa Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 821, 



fig. Raymond, Bull. Amer. Pal., 3, 1902, p. 306, pi. 19, fig. 12. Weller, Geol. 



Surv. Pal. New Jersey, 3, 1903, p. 179, pi. 12, fig. 35. Branson, Trans. Acad. 



Sci. St. Louis, 18, 1909, p. 45, pi. 7, fig. 14. 

 Black River: Watertown, New Poland, etc., New York; Dixon, Illinois; Lincoln 



County, Missouri. 

 ?Trenton: Jacksonburg, New Jersey. 



Pterotheca pentagona Foerste. 



Pterotheca pentagona Foerste, Bull. Sci. Lab. Denison Univ., 17, 1914, p. 313, 



pi. 2, figs. 1, 2. 

 Cincinnatian (Pulaski): Near Chambly, etc., Quebec. 



Pterotheca saffordi (Hall). 



Clioderma saffordi Hall, 14th Rep. New York State Cab. Nat. Hist., 1861, p. 96, 

 pi. 6, figs. 15-17. 



