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



Leptaenisca adnascens Hall and Clarke. Lower Helderberg (Uev.). 



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



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

 Loc. Near Clarksville, New York. 



Leptaenisca concava Ilall. Lower Helderberg (Dev.). 



Lepta-na coucava Hall, Tenth Rep. New York State Cab. Nat. Hist., 1857, p. 



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

 Lopticna? (subgenus?) concava Hall, Second Ann. Kep. New York State Geol., 



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

 Lepticnisca 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. 

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



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



Lepta-nieca 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 Leptsena 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.). 



Leptwna 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. 

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



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



Lepta^na 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. 



LEPTOBOLTJS Hall. Genotype L. lepis Hall. 



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



Twenty-fourth Rep. 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. 



Loptoliolus graudis Matthew, Trans. Royal Soc. Canada, X, 1874, p. 91, pi. 16, 

 fig. 7. 



Loc. Hardingville, Now Brunswick. 



Leptobolus insignis Hall. Utica (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, j). 74, pi. 3, figs. 1-6. 



Loc. Middk'ville, Utica, etc.. New York; Ottawa, Canada ; Cincinnati, Ohio. 



Leptobolus lepis Hall. Utica (Ord.). 



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

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

 1872, p. 226, pi. 7, figs. 19, 20.— Hall and Whitfield, Pal. Ohio, II, 1875, p. ()9, 

 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. 



Lor. Cincinnati, Ohio. 



