242 SYNOPSIS OF AMERICAN FOSSIL BRACIIIOPODA. [bull. 87. 



Leptsenisca adnascens Hall and Clarke. Lower Helderberg (Dev.). 



Lepta'iiisca adnasceus Hall and Clarke, Pal. New York, VIII, Pt. 1, 1892, pp. 301, 



352, pi. 15A, ligs. 22, 23. 

 Loc. Near Clarksville, New York. 

 Leptaenisca concava Hall. Lower Helderberg (Dev.). 



Leptana coucava Hall, Tenth Rep. New York State Cab. Nat. Hist., 1857, p. 



47; -Pal. New York, III, 1859, p. 197, pi. 18, fig. 2. 

 Lept;ena? (subgenus?) concava Hall, Second Ann. Rep. New York State Geol., 



1883, pi. 46, figs. 30, 31. 

 Leptienisca concava Beecher, American Jour. Sci., 3d ser., XL, 1890, p. 238, pi. 



9, figs. 1-5.— Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 300, pi. 15, 



figs. 30, 31; pi. 15A, figs. 19-21. 

 Loc. Albany County, New York; Decatur County, Tennessee. 



Leptaenisca tangens Hall and Clarke. Lower Helderberg (Dev.). 



Leptaenisca tangens Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, pp. 301, 



352, pi. 15A, figs. 24-30. 

 Loc. Near Clarksville, New York. 



LEPTELLA Hall and Clarke. Genotype Leptfena sordida Billings. 



Leptella Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 293;— Eleventh 

 Ann. Rep. New York State Geologist, 1894, p. 277. 



Leptella decipiens (Billings). Calciferous (Ord.). 



Leptfena decipiens Billings, Pal. Fossils, I, 1862, p. 74, fig. 67; p. 219; — Geol. 



Canada, 1863, p. 231, fig. 243. 

 Leptella decipiens Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 294. 

 Loc. Point Levis, Canada ; Portland Creek, Newfoundland. 



Leptella sordida (Billings). Calciferous (Ord.). 



Leptaina sordida Billings, Pal. Fossils, 1, 1862, p. 73, fig. 66; — Geol. Canada, 1863, 



p. 231, fig. 242. 

 Leptella sordida Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 293, pi. 



15A, figs. 12-16. 

 Loc. Point Levis, Canada. 



LEPTOBOLUS Hall. Genotype L. lepis Hall. 



Leptobolus Hall, Description n. sp. Foss. from Hudson River Group, 1871, p. 3; — 

 Twenty-fourth Kep. New York State Cab. Nat. Hist., 1872, p. 226.— Hall and 

 Clarke, Pal. New York, VIII, Pt. I, 1892, pp. 73, 165 ;— Eleventh Ann. Rep. 

 New York State Geologist, 1894, p. 241. 



Leptobolus grandis Matthew. Lowest Ordovician. 



Leptobolus grandis Matthew, Trans. Royal Soc. Canada, X, 1874, p. 91, pi. 16, 



fig. 7. 

 Loc. Hardingville, New Brunswick. 



Leptobolus insignis Hall. TJtica (Ord.). 



Leptobolus insignis Hall, Descrip. n. sp. Foss. from Hudson River Group, 1871, 

 p. 3, pi. 3, fig. 17;— Twenty-fourth Rep. New York State Cab. Nat. Hist., 

 1872, p. 227, pi. 7, fig. 17. — Nicholson, Pal. Province Ontario, 1875, p. 85. — 

 Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 74, pi. 3, figs. 1-6. 



Loc. Middleville, Utica, etc.. New York; Ottawa, Canada; ("incinnati, Ohio. 



Leptobolus lepis Hall. Utica (Ord.). 



Leptoooius lepis Hall, Description n. sp. Foss. from Hudson River Group, 1871, 

 p. 3, pi. 3, figs. 19, 20;— Twenty-fourth Rcjt. New York State Cab. Nat. Hist., 

 1872, p. 226, pi. 7, figs. 19, 20.— Hall and Whitfield, Pal. Ohio, II, 1875, p. 69, 

 pi. 1, figs. 10, 11. — Miller, Cincinnati Quart. Jour. Sci., II, 1875, p. 11.— Hall 

 and Clarke, Pal. New York, VIII, Pt. 1, 1892, p. 74, pi. 3, figs. 8-10. 



Loc. Cincinnati, Ohio. 



