168 INDEX TO NORTH AMERICAN GEOLOGY, PALEONTOLOGY, [bull. 189. 
Paleontology— Continued. 
General— Continued. 
Studies of Palaeechinoidea, Jackson, 2871. 
Study of Dsemonelix, Barbour, 232. 
Study of graptolites, Ruedernann, 4691. 
Subdivisions of genera, Hilgard, 2526. 
Supplement to the bibliography of the Paleo- 
zoic Crustacea, Vogdes, 5759. 
Synopsis of American fossil Bryozoa, Nickles 
and Bassler, 4096. 
Systematic position of trilobites, Kingsley, 
3182. 
Tapirs, past and present, Earle, 1593. 
Terminology of vertebral centra, Wieland, 
6134. 
Terminology proposed for description of the 
shell of Pelecypoda, Hyatt, 2822. 
The development and phylogeny of Placen- 
ticeras, Smith, 5055. 
The drift in Staten Island, New York, Hollick, 
2710. 
The Ganodonta, Osborn, 4196. 
The history of the Pelycosauria, with a de- 
scription of the genus Dimetrodon, Cope, 
Baur and Case, 300. 
The McHenry formation, Uhler, 5527. 
The nature of Palseotrochis, White, C. A., 6038. 
The study of fossil plants, Dawson, 1442. 
Tiaporus, on, Cope, 1080. 
Timepiece of geology, Claypole, 1000. 
Tomiopsis, the genus, Cope, 1085. 
Torosaurus, skull of, Marsh, 3670. 
Traces of a fauna in the Cambridge slates, 
Woodworth, 6445. 
Triarthrus, larval form of, Beecher, 355. 
Triarthrus, thoracic legs of, Beecher, 356. 
Typical Ornithopoda of the American Juras- 
sic, Marsh, 3687. 
Validity of Bohemillidse Barrande, Beecher, 
371. 
Validity of some fossil species of Lirioden- 
dron, Holm, 2713. 
Value of type specimens, Marsh, 3714. 
Variations in Xiphactinus Leidy, Stewart, 
5238. 
Variations of Sprifier cameratus Morton, 
Beede, 387. 
Ventral armor of Dinichthys, Wright, 6499, 
6500. 
Ventral armoring of Dinichthys, Dean, 1473. 
Ventral structure of Triarthrus, Beecher, 
365. 
Vertebrata, paleontology of, Cope, 1084. 
Vertebrate fossils, notes on Mesozoic, Marsh, 
3674. 
Vertebrate paleontology at the Columbian 
Exposition, Eyerman, 1727. 
Vertebrate remains from Port Kennedy, Penn- 
sylvania, Cope, 1104. 
Virginia, stratigraphy of central Appala- 
chian, Darton, 1295. 
Waldron fauna at Tarr Hole, Indiana, Cum- 
ings, 1218. 
Wachsmuth and Springer's classification of 
crinoids, Bather, 296. 
Well-marked stages in the evolution of the 
Testudinate Humerus, Wieland, 6137. 
Paleontology— Continued. 
General — Continued. 
Winchellia, genus, Lesquereux, 3471. 
Wyoming fossil fields expedition, 1899, Knight, 
3218. 
Zoological position of trilobites, Barnard, 257. 
Genera and species described. (The classifica- 
tion of genera, subgenera, and species, as 
well as the spelling of names, is that given 
by each author, and all specific names are 
in lower-case type. ) 
Abietites angusticarpus Fontaine, Fontaine, 
1850. 
carolinensis Fontaine, Ward, 5857. 
cretacea, n. sp., Newberry, 4083. 
linkii, Fontaine, 1846, 1847. 
Abra (Leach) Lamarck, Dall, 1281. 
aequalis Say, Dall, 1281. 
sequalis, Whitfield, 6101. 
nitens Lea, Dall, 1281. 
subreflexa Conrad, Dall, 1281. 
triangulata n. sp., Dall, 1281. 
Abrotocrinus cymosus n. gen. et sp., Miller 
and Gurley, 3991. 
Acacia lamarensis n. sp., Knowlton, 3255. 
raacrosperma n. sp., Knowlton, 3255. 
wardii n. sp., Knowlton, 3255. 
Acacocrinus americanus W. and Sp., (n. sp.), 
Wachsmuth and Springer, 5765a. 
elrodi W. and Sp. (n. sp.), Wachsmuth 
and Springer, 5765a. 
Acalyptus obtusus, Scudder, 4890. 
Acambona White, Hall and Clarke, 2261, 2264. 
Acanthoceras justinae n. sp., Hill, 2539. 
kanabense n. sp., Stanton, 5191. 
spiniferum (nom. mut.),Whiteaves, 6095a. 
woolgari Mantell (sp.), Whiteaves, 6073. 
Acanthocladia, Simpson, 4983. 
pinnati n. sp., 4656. 
Acanthoclema, Simpson, 4983. 
Hall, Grabau, 2086. 
scutulatum Hail, Grabau, 2086. 
Acanthodes, Case, 766. 
semistriatus n. sp., Woodward, 6434. 
Acanthodictya Hinde, Dawson, 1452. 
hispida Hinde. Dawson, 1452. 
hispida Hinde, Rauff, 4548. 
Acantholenus siniger Matt., Matthew, 3781. 
Acanthosphsera, Matthew, G. F., 3760. 
Acanthothyris D'Orbigny, Hall and Clarke, 
2264. 
Acer amboyense n. sp., Newberry, 4080. 
bendirei Lesquereux, Knowlton, 3262. 
florissanti n. sp., Kirchner, 3187. 
mysticum n. sp., Kirchner, 3187. 
paucidentatum n. sp., Hollick, 2698. 
pleistocenieum, Dawson, G. M., 1418. 
sp., Newberry, 4083. 
trilobatum productum (Al. Braun) Heer, 
Knowlton, 3232. 
trilobatum productum? Heer, Knowlton, 
3216. 
vivarium n. sp., Knowlton, 3255. 
Aceratherium filtroli n. sp., Osborn, 4221. 
incisivum, Osborn, 4215. 
occidentale Leidy, Osborn and Wortman, 
4189. 
