158 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [bull. 87. 



Beachia siiessana llall. Oiiskany (Dev.). 



Megauteiis suessana Hall, Tenth Kep. Now York State Cab. Nat. Hist., 1857, 



p. 100. 

 Reussehrria suessaua Hall, Pal. New York, III, 1>:!59, p. 459, pi. 107, ligs. 1-15. 

 Beachia suessana Hall and Clarke, Ibidem, VIII, Pt. II, 18915, p. 260, pi. 77, 



tigs. 1-11. 

 I.oc. Ciiinlicrland, Maryland; near Rondout, New York. 



BEECHERIA Hall and Clarke. Genotype B. davidsoni Hall and Clarke. 



Beerberia Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 300;— Thirteenth 



Ann. Rep. New York State Geologist, 1895, p. 866. 

 Beecheria davidsoni Hall and Clarke, Upper Cail)()iiifeious. 



Beecheria davidsoni Hall and Clarke, Pal. New York, VIII, Pt. U, 1893, p. 300, 



lig. 224, pi. 79, ligs. 33-36. 

 J.or. Windsor, Nova Scotia. 



BILLINGSELLA Hall and Clarke. 



Genotype Ortliis pepina Hall=0. coloradoensis Slinniard, 

 Billingsella and Protorthis Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, 



1)1». 230, 231;— Eleventh Ann. Rep. New York State Geologist, 1894, p. 273. 

 01)8. Protorthis was founded on Orthis billingsi Hartt, a species rarely found in 

 good preservation. The diagnostic character was supposed to be the pres- 

 ence of a rudimentary spondylium aud the absence of a deltidium. In the 

 National Museum collection, however, there are two artificial casts of the 

 ventral valve made from Hartt's original specimens and other material 

 collected by Mr. Walcott, showing O. billingsi to be without a spondylium. 

 The rostral plate is the deltidium distorted by pressure to which these 

 shells have been subjected. The only character of generic importance is 

 that the geologically older species of Billingsella have a more rudimentary 

 or nearly obsolete cardinal process than the type species. This difference, 

 however, hardly justifies the retention of Protorthis. 



Billingsella alberta (Walcott). Middle Cambrian. 



Orthisina alberta Walcott, Proc. U. S. National Mus., XI, 188S, p. 442. 

 Loc. Mount Stephan, British Columbia. 

 Billingsella billingsi (Hartt). Middle Cambrian. 



Orthis billingsi Hartt, Dawson's Acadian Geology, 2d ed., 1868, p. 644, fig. 223.— 

 Walcott, Bull. U. S. Geol. Survey, 10, 1884, p. 17, pi. 1, lig. 1.— Matthew, 

 Trans. Royal Soc. Canada, III, 1886, p. 43. 



Orthis? billingsi Matthew, Ibidem, VIII, 1891, p. 131. 



Protorthis billingsi Hall and Clarke, Pal. New York, VIII, Pt. I, 18!t2, \>]>. 219, 

 232, pi. 7A, figs. 14-20. 



Loc. St. .John, New Brunswick. 



Billingsella coloradoensis (Shumard). Upper Cambrian. 



Orthis coloradoensis Shumard, Trans. St. Louis Acad. Sci., I, 1860, p. 627. 



Orthis pepina llall, Sixteenth Rep. New York State Cab. Nat. Hist., 1863, p. 134, 

 pi. 6, figs. 23-27;— Trans. Albany Institute, V, 1867, p. 113.— Whitfield, 

 Geol. Wisconsin, IV, 1882, p. 170, pi. 1, figs. 4,5. 



Orthis? (Orthisina?) pepina Hall, Second Ann. Rep. New York State (ieologist, 

 1883, pi. 37, ligs. 16-19. 



Billingsella pepina Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 230, jd. 

 7, figs. 16-19; pi. 7A, tigs. 7-9. 



Orthis (Billingsella) pepina Sardeson, Bull. Minnesota Acad. Nat. Sci., IV, 1896, 

 p. 96. 



Loc. Burnett County, Texas; Lake Pepin, Minnesota; St. Croix River and Ber- 

 lin, Wisconsin. 



