248 INDEX TO NORTH AMERICAN GEOLOGY, PALEONTOLOGY, [bull. 189. 
Paleontology— Continued. 
Genera and species described— Continued. 
Oncocera minnesotense n. sp., Clarke, 953. 
pandion Hall, 1861, Clarke, 953. 
whiteavesii Miller. Whiteaves, 6087. 
Oncoceras abruptum, Whitfield, 6102. 
alceus, Whitfield, 6102. 
lycus, Whitfield, 6102. 
pandion, Whitfield, 6102. 
plebeium, Whitfield, 6102. 
Oncodoceras n. gen., Hyatt, 2816. 
Oncosella catinum n. sp., Rauff, 4548. 
Onochodus sigmoides Newb., Eastman, 160f>. 
Onoclea minima n. sp., Knowlton, 3255. 
Onolcleasensibillus fossilis Newb., Newberry, 
4083. 
Onychaster asper n. sp., Miller, 3992. 
confragosus n. sp., Miller, 3992. 
demissus n. sp., Miller, 3992. 
Onychochilus nitidulus n. sp., Clarke, 946. 
Onychocrinus cantonensis n. sp., Miller and 
Gurley, 3991. 
monroensis (Meek and Worthen), Keyes, 
3061. 
parvus n. sp., Miller and Gurley, 3997a. 
pulaskiensis n. sp., Miller and Gurley, 
3997d. 
ulrichi n. sp., Miller and Gurley, 3991. 
Onychodectes Cope, Wortman, 6492. 
rarus n. sp., Osborn and Earle, 4191. 
tissonensis Cope, Osborn and Earle, 4191. 
Opali, see Scala (Opalia) H. and A. Adams, 
Dall, 1259. 
Operculina complanata Def ranee sp., Wood- 
ward and Thomas, 6433. 
var. granulosa Leymerie, Woodward and 
Thomas, 6433. 
Ophiderpeton, Case, 767. 
Ophidioceras, Hyatt, 2819. 
rudens, Hyatt, 2819. 
tener, Hyatt, 2819. 
tessallatum, Hyatt, 2819. 
Ophileta complanata Vanuxem, Cleland, 1012. 
discus n. sp., Cleland, 1012. 
Ophiletina n. gen., Ulrich and Scofield, 5541. 
angularis n. sp., Ulrich and Scofield, 5541. 
sublaxa n. sp., Ulrich and Scofield, 5541. 
Ophioglossum granulatum Herr, Newberry, 
4080. 
Ophioglypha bridgerensis (Morton), Clark, 
892. 
texana Clark, Clark, 892. 
Ophryastes grandis, Scudder, 4890. 
petrarum, Scudder, 4890. 
Ophryastites n. gen., Scudder, 4890. 
absconsus, Scudder, 4*90. 
cinereus, Scudder, 4890. 
digressus, Scudder, 4890. 
dispertitus, Scudder, 4890. 
Opis californica n. sp., Stanton, 5199. 
texana n. sp., Cragin, 1115. 
triangulata Cooper (Stanton), Cooper, 
1072. 
Opisthoptera Meek, Ulrich, 5535. 
alternata n. sp., Ulrich, 5535. 
ampla n. sp., Ulrich, 5535. 
extenuata n. sp., Ulrich, 5535. 
Paleontology— Continued. 
Genera and. species described — Continued. 
Opisthoptera fissicosta Ulrich, 5535. 
laticostata n. sp., Ulrich, 5535. 
notabilis n. sp., Ulrich, 5535. 
obliqua n. sp., Ulrich, 5535. 
Oppelia ? sp. Stanton, 5206. 
Oracanthus lineatus n. sp., Newberry, 4082. 
pugiunculus St. J. and W.. Newberry, 4082. 
vetustus, Newberry, 4082. 
Oracodon conulus n. sp., Marsh, 3671. 
Orbicula Sowerby, Hall and Clarke, 2260. 
Orbiculoidead'Orbigny, Grabau, 2086. 
Orbiculoidea Davidson, Hall and Clarke, 2260. 
Orbiculoidea d'Orbigny, Hall and Clarke, 2260. 
Orbiculoidead'Orbigny, Winchell and Schu- 
chert, 6319. 
batesvillensis n. sp., Weller, 5986. 
berzeri, Hall and Clarke, 2268. 
capax (White), Weller, 6006. 
doria Hall, Grabau, 2086. 
hartti n. sp., Clarke, 976. 
herzeri n. sp., Hall and Clarke, 2260. 
lamellosa Hall ?, Winchell and Schuchert, 
6319. 
lodiensis Vanuxem, Grabau, 2086. 
media Hall, Grabau, 2086. 
numulus n. sp., Hall and Clarke, 2260. 
numulus, Hall and Clarke, 2268. 
(Schizotreta) ovalis n. sp., Hall and 
Clarke, 2060, 2268. 
sp., Girty, 2035. 
Orbulina ? intermedia n. sp., Matthew, 3761. 
? ingens n. sp., Matthew, 3761. 
ovalis n. sp., Matthew, 3761. 
univerda, McClung, 3840. 
universa d'Orbigny, Woodward and 
Thomas, 6433 
Orchestes languidulus, Scudder, 4890. 
Oreodon, Wortman, 6487. 
bullatus Leidy, Osborn and Wortman, 4189. 
culbertsonii Leidy, Osborn and Wortman, 
4189. 
culbertsonii Leidy, Stewart, 5236. 
gracilis Leidy, Osborn and Wortman, 41S9. 
Oriskania n. gen., Hall and Clarke, 2261a. 
navicella, Hall and Clarke, 2261a, 2268. 
sinuati n. sp., Clarke, 971. 
Ornithochierus, Case, 768. 
Ornithomimus, Marsh, 3701, 3702. 
sedens, n. sp., Marsh, 3672. 
Ornithostoma, Williston, 6224, 6231. 
ingens, Williston, 6234. 
Ornithotarsus immanis Cope, Woolman, 6474. 
Orodus basilis n. sp.. Cope, 1093. 
Oromeryx (?) Marsh, Scott, 4884. 
plicatus n. sp., Marsh, 3690. 
Orophocrinus stillii'ormis (Owen and Shu- 
mard), Keyes, 3061. 
whitei, Whitfield, 6098. 
Orthaulax, see Rostellaria (Orthaulax) Gabb, 
Dall, 1259. 
Orthidium n.gen., Hall and Clarke, 2260. 
Orthis Dalman, Kail and Clarke, 2260. 
Orthis Dalman emend Hall, Winchell and 
Schuchert, 6319. 
a.mcena N. H. Winchell, Winchell and 
Schuchert, 6319 
