262 INDEX TO NORTH AMERICAN GEOLOGY, PALEONTOLOGY, [btjll^189, 
Paleontology— Continued. 
Genera and species described— Continued. 
Platyodon Conrad, Dall, 1272. 
Platyostoma Conrad, Grabau, 2086. 
broadheadi n. sp., Miller, 3992. 
lineata Conrad, Grabau, 2086. 
var. emarginata n. var. Grabau, 2086. 
minutum n. sp., Girty, 2086. 
tumidum n. sp., Whiteaves, 6074. 
Platyschisma barrisi (Win.), Weller, 6006. 
depressa n. sp., Weller, 6006. 
missouriensis n. sp., Weller, 5994. 
Platysomua lacovianus n. sp., Cope, 1076. 
palmaris n. sp., Cope, 1076. 
Platystegos loricatum n. sp., Dawson, J. W., 
nit;. 
Platystetb.ua archetypus n. sp., Scudder, 4900. 
carcareus n. sp., Scudder, 4900. 
Platystrophia King, Hall and Clarke, 2260. 
lynx (Eichwald), Keyes, 3062. 
Platytrochus claibornensis de Gregorio, 
Vaughan, 5735. 
goldfussi (Lea), Vaughan, 5735. 
stokesi (Lea), Vaughan, 5735. 
Platyxytrodus striatus, Hay, 2381. 
Plectarnbonites Pander, Hall and Clarke, 
2260. 
Plectarnbonites Pander, Winchell and Schu- 
chert, 6319. 
gibbosa, Winchell and Schuchert, 6298. 
gibbosa W. and S., Winchell and Schu- 
chert, 6298. 
producta n. sp., Hall and Clarke, 2261a, 
2263. 
producta, Hall and Clarke, 2268. 
rhomboidalis (Wilckens), Keyes, 3062. 
sericea Sowerby sp., Winchell and Schu- 
chert, 6319. 
transversalis, Foerste, 1835. 
Plectoceras, Hyatt, 2819. 
bickmoreanus sp., Whitfield, Hyatt, 2819. 
obscurum n. sp., Hyatt, 2819. 
Plectoderrna scitulum Hinde, Rauff, 4548. 
Plectonotus derbyi n. sp., Clarke, 976. 
? salteri n. sp., Clarke, 976. 
Plectorthis, Hall and Clarke, 2260. 
Pleisiochelys belviderensis n. sp., Cragin, 
1119. 
Plesiosaurus, Case, 768. 
gouldii n. sp., Williston, 4180. 
mudgei n. sp., Cragin, 1119. 
plicatus, Marsh, 3695. 
Shirley ensis n. sp., Knight, 3216. 
Plethocardia n. gen., Ulrich, 5534. 
Plethocardia Ulrich, Ulrich, 5539. 
suberecta n. sp., Ulrich, 5534, 5539. 
umbonata n. sp., Ulrich, 5534, 5539. 
Plethomytilus Hall, Grabau, 2086. 
oviformis (Conrad), Grabau, 2086. 
Plethospira n. gen., Ulrich and Scofield, 5541. 
semele Hall, Ulrich and Scofield, 5541. 
socialis n. sp., Girty, 2035. 
striata n. sp., Ulrich and Scofield, 5541. 
?n. sp., Girty, 2037. 
Pleuracanthus, Case, 766. 
(Didymodus) compressus Newb.. Case, 
773. 
Paleontology— Continued. 
Genera and species described — Continued. 
Pleuracanthus (Orthacanthus) gracilis 
Newb., Case, 773. 
(Orthacanthus) quadriseriatus Cope, Case, 
773. 
Pleuroccelus, Marsh, 370. 
Pleurocystites mercerensis n. sp.. Miller and 
Gurley, 3997d. 
Pleurodictyum, Girty, 2032. 
Pleurodictyum Goldfuss, Grabau, 2086. 
lenticulare, Beecher, 352. 
stylopora (Eaton), Grabau, 2086. 
Pleurodon S. Wood, Dall, 1272. 
woodii n. sp., Dall, 1272. 
Pleuromya concentrica n. sp., Hyatt, 2818. 
(?) henselli n. sp., Hill, 2539. 
inconstans n. sp., Aguilera, 57. 
papracea var. carlottensis, Whiteaves, 
6095a. 
subcorapressa Meek, Logan, 3559. 
subcompressa Meek, Stanton, 5206. 
Pleuronautilus, Hyatt, 2819. 
Pleuronotos decewi (Billings) Hall?, Girty, 
2039. 
Pleurophorus oblongus Meek, Keyes, 3062. 
taffi n. sp., Girty, 2037. 
Pleurostomella subnodosa Reuss, Woodward 
and Thomas, 6433. 
subnodosa Reuss, Bagg, 150. 
Pleurotoma albida Perry, Dall, 1279. 
beadata n. sp., Harris, 2307. 
cainei n. sp., Harris, 2316. 
capax Whitf., Harris, 2316. 
carlottse n. sp., Harris, 2316. 
clarkeana n. sp., Aldrieh, 7. 
decipiens n. sp., Cooper, 1071. 
denticulata Edw. var., Harris, 2316. 
enstricrina n. sp., Harris, 2307. 
exilloides Aid., Harris, 2316. 
farmingdalensis n. sp., Whitfield, 6097. 
georgei n. sp., Harris, 2316. 
harrisi n. sp., Clark, 904, 906. 
? hitzi Meek, Herrick and Johnson, 2465. 
hitzi Meek, Stanton, 5191. 
huppertzi n. sp., Harris, 2307. 
var. penrosei n. var., Harris, 2307. 
huppertzi var., Harris, 2315. 
insignifica Heilp., Harris, 2307. 
langdoni n. sp., Aldrieh, 73. 
langdoni Heilp., Harris, 2316. 
leoncola n. sp., Harris, 2316. 
longipersa, n. sp., Harris, 2310. 
mediavia n. sp., Harris, 2310. 
mediavia Har. var., Harris, 2376. 
var. equiseta n. var., Harris, 2316. 
moniliata Heilp., Harris, 2316. 
moorei Gabb, Harris, 2316. 
nasuta Whitf., Harris, 2311. 
nebulosa n. sp., Harris, 2316. 
ostrarupis, Harris, 2315, 2316. 
perkinsiana n. sp., Cooper, 1071. 
persa, Harris, 2310. 
pulcherrima, Aldrieh, 74. 
regularicostata n. sp., Whitfield, 6097. 
roscoei n. sp., Harris, 2316. 
servata Conrad, Dall, 1279. 
