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



Strophonella striata Hall. Niagara (Sil.). 



Stropbomeua striata Hall, Geol. N. Y.; Kep. Fourth Dist., 1843, p. 104, lig. 3; — 



Twelfth Eep. N. Y. State Cab. Nat. Hist., 1859, p. 82. 

 Strophodonta striata Hall, Twenty-eighth Kep., Ibidem, 1879, p. 152, pi. 23, figs. 



1-6;— Eleventh Rep. Indiana State fieol., 1882, p. 290, pi. 23, figs. 1-6.— Net- 



telroth, Kentucky Fossil Shells, Mem. Kentucky (leol. Survey, 1889, p. 149. 

 LeptiPna striata Hall, Pal. New York, 11, 1852, p. 259, pi. 53, lig. 7. 

 Strophodonta (Strophonella?) striata Hall, Second Ann. Rep. N. Y. State Geol., 



1883, pi. 43, ligs. 1-3. 

 Strophonella striata Beecher and Clarke, Mem. N. Y. State Mus., 1, 1889, p. 25, pi. 



3, ligs. 1-8. 

 Strophomena hanoverensis Foerste, Proc. Boston Soc. Nat. Hist., XXIV, 1890, p. 



301, pi. 6, fig. 1. 

 Strophonella (Ampbistrophia) striata Hall and Clarke, Pal. New York, VIII, Pt. 



I, 1892, p. 292, pi. 12, figs. 1-3. 

 Strophomena (Ortbotbetes) hanoverensis Foerste, Geol. Ohio, \'II, 1895, p. 567, 



pi. 27, fig. 34; pi. 31, fig. 1. 

 Loc. Lockport, New York ; Waldron and Hanover, Indiana ; Louisville, Kentucky. 



Syntrielasma Meek and Worthen=Enteletes. 



SYNTROPHIA Hall and Clarke. Genotype Triplesia lateralis Wliittield. 



Syntrophia Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 270;— Ibidem, 



Pt. II, 1893, p. 216;— Thirteenth Ann. Rep. N. Y. State Geologist, 1895, p. 836. 



Syntrophia arachne (Billings). Upper Cambrian. 



Stricklandia? arachne Billings, Pal. Fossils, I, 1862, p. 85, fig. 77. 



Syntrophia arachne Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 216. 



Loc. Point Levis, Canada. 



Syntrophia arethusa (Billings). Upper Cambrian. 



Strickland inia? arethusa Billings, Pal. Fossils, 1, 1862, p. 85, fig. 78. 

 Syntrophia arethusa Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 216. 

 Loc Point Levis, Canada. 



Syntrophia (?) armanda (Billings). Upper Cambrian. 



Orthis? armftuda Billings, Pal. Fossils, I, 1865, p. 303, fig. 293.— Hall and Clarke, 

 Pal. New York, VIII, Pt. I, 1892, p. 217. 



Loc. Phillipsburg, Canada. 



Ohs. This species may prove to be a Billingsella. Iji the interior of the ventral 

 valve "the dental plates seem to form an imperfect triangular chamber" 

 (Billings). If there is present a true spondylium and the foramen is "ai)par- 

 ently open" O. armanda will prove to be more nearly related to Syntrophia 

 than to any other genus. If, however, there is present only an imperfect 

 triangular chamber and the foramen closed by a deltidium, then the species 

 is probably a Billingsella. 



Syntrophia harabnensis (A. Winchell). Upper Cambrian. 



Ortliis 1)arabueiisis A. Winchell, American Jour. Sci., 2d8er.,XXX\'II, 1861, ]). 228. 

 Lepta-na barabuensis Whitfield, Ann. Rep. Ge(d. Survey Wisconsin, 1877, p. 60; — 



Geol. Wisconsin. IV, 1882, pp. 171, 195, pi. 1, iigs. 6, 7; pi. 3, fig. 6. 

 Syntrophia barabuensis Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, 



p. 216. 

 Loc. Near Baraboo, Wisconsin. 



Syntrophia calcifera (Billings). Upper Cambrian. 



Camarella calcifera Billings, Canadian Nat. Geol., VI, 1861, p. 31S, fig. 3; — Geol, 

 Canada, 1863, p. 231, fig. 247;— Pal. Fossils, I, 1865, p. 220.— Meek, Sixth 

 Ann. Rep. U. S. Geol. Survey Terr., 1873, p. 464. 



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