BRACHIOPODA. 233 



22 mm., width 26 mm. Hinge line long and straight, and equal to the greatest width of 

 the shell. Surface marked with prominent, radiating, nodose costae, which increase by 

 bifurcation and present a somewhat bunched and uneven appearance. 



Remarks — This form has the general outline of Stropheodonta demissa Conrad, and 

 the characteristic surface markings, but is more distinctly concave. 



Horizon — Lower beds. 



Figured specimens No. 27477 Walker Museum. 



Stropheodonta cf. inequiradiata Hall 

 Plate 61, figures 19-20. 



1887. Strophomena {Strophodonta) inequiradiata Hall, Tenth Rept. N. Y. State Cab. 



Nat. Hist., p. 113, figs. 1-3. 

 1861. Strophomena inequistriata Billings, Can. Jour. Sci. Arts, 6, p. 338, fig. 113. 



Geol. of Canada, 1863, p. 367, fig. 375. 



Pal. Fossils, 2, 1874, p. 24, fig. 13; pi. 2, fig. 4, p. 240. 

 1867. Strophodonta inequiradiata Hall, Pal. N. Y. vol. 4, p. 87, pi. 11, figs. 24-31; 



pi. 12, fig. 12; pi. 13, figs. 6-11. 



Second Ann. Rept. N. Y. State Geol., 1883, pi. 45, figs. 13-14. 



Walcott, Mon. U. S. G. S., vol. 8, 1884, p. 120, pi. 11, fig. 11. 

 1892. Stropheodonta inequiradiata Hall and Clarke, Nat. Hist. N. Y. Pal., vol. 8, pt. 1, 



pi. 14, figs. 13-14. 

 Two pedicle valves of a Stropheodonta have been observed which bear a marked 

 resemblance to this Onondaga« species. They are smaller than those figured in the New 

 York reports, but exhibit the same semi-circular outline, high convexity, and the char- 

 acteristic uneven and variable costae. 

 Horizon — Upper beds. 

 Figured specimens No. 27476 Walker Museum. 



Genus Leptostrophia Hall and Clarke 



Leptostrophia magnifica (Hall) 

 Plate 62, figures 1-3. 



1857. Strophodonta magnifica Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., 



pi 54. 

 1859. Strophodonta magnifica Hall, Nat. Hist. N. Y. Pal., vol. 3, pp. 414, 482, pi. 93, 



fig. 4; pi. 94, figs. 2a-2d; pi. 95, fig. 8; pi. 95a, figs. 15-19. 

 1859. Strophodonta vascularia Hall, ibidem, vol. 3, p. 412, pi. 92, fig. 4; pi. 95, fig. 10 



(not pi. 93, figs. 2b, 2c=? S. magniventra), 1861. 

 1861. Strophomena magnifica Billings, Can. Jour. Sci. Arts, vol. 6, p. 348. 

 1863. Strophomena magnifica Billings, Geol. Canada, p. 961, fig. 468. 

 1883. Strophodonta magnifica Hall, Second Ann. Rept. N. Y. State Geol., pi. 44, figs. 



27-28. 

 1892. Stropheodonta {Leptostrophia) magnifica Hall and Clarke, Nat. Hist. N. Y. Pal., 



vol. 8, pt. I, p. 288, pi. 13, figs. 27-28. 

 1900. Leptostrophia magnifica Clarke, Mem. N. Y. State Mus., vol. 3, No. 3, p. 53, p. 



7, fig. 36. 

 1908. Leptostrophia magnifica Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, pp. 190- 



191, pi. 38, figs. 1-2; pi. 39, figs. 9-10. 

 1913. Stropheodonta {Leptostrophia) magnifica Schuchert, Geol. Surv., Md. Low. Dev., 



p. 318, pi. 58, figs. 2-5. 

 Description — Shell varying in size from medium to large, more or less semi-oval 

 in shape, cardinal extremities usually well rounded, width a little greater than length, 



