256 INDEX TO NORTH AMERICAN GEOLOGY, PALEONTOLOGY, [bull. 189. 
Paleontology— Continued. 
a tiii< i species described— Continued, 
pentacrinus bryani Gabb, Clark, 892. 
caput, Say, 4813. 
whitei Clark, Clark, 892. 
Pentagonia Cozzens, Hall and Clarke, 2261, 
2264. 
Pentamerella Hall, Hall and Clarke, 2261a, 
2264. 
Pentamerus Sowerby, Hall and Clarke, 2261a, 
2264. 
colletti n. sp., Miller, 3992. 
corrugatus n. var., Weller and Davison, 
5978. 
ducussatus Whiteaves, Calvin, 689. 
oblongus Sowerby var. maquoketa, Hall 
and Clarke, 2268. 
var. subrectus, Hall and Clarke, 2268. 
oblongus Sowerby var., Weller and Davi- 
son, 5978. 
oblongus var. bisinuatus, Whiteaves, 6080. 
occiden talis Hall, Whiteaves, 6080. 
pes-ovis, Whitfield, 6099. 
salinensis Swallow, Keyes, 3062. 
Pentremiridea filosa Whiteaves (?), Weller, 
5988. 
milwaukensis n. sp., Weller, 5988. 
Pentremite, Say, 4813. 
florealis Schloth., Say, 4813. 
globosa, Say, 4813. 
pyriformis, Say, 4813. 
Pentremites benedicti n. sp., Rowley, 4677. 
conoideus Hall, Keyes, 3061. 
elegans, Whitfield, 6099. 
elongatus Shumard, Keyes, 3061. 
Pephricaris horripilata n. sp., Clarke, 959. 
Peplorhina arctata Cope, Case, 773. 
Perchcerus (Dicotyles) antiquus, Marsh, 3681. 
Peregrinella Oehlert, Hall and Clarke, 2264. 
Periechocrinus Austin, Wachsmuth and 
Springer, 5765a. 
howardi (S. A. Miller), Wachsmuth and 
Springer, 5765a. 
infelix (Winch, and Marcy), Wachsmuth 
and Springer, 5765a. 
marcouanus (Winch, and Marcy), Wachs- 
muth and Springer, 5765a. 
necis (Winch, and Marcy), Wachsmuth 
and Springer, 5765a. 
ornatus (Hall), Wachsmuth and Springer, 
5765a, 
speciosus (Hall), Wachsmuth and 
Springer, 5765a. 
tennesseensis (Hall), Wachsmuth and 
Springer, 5765a. 
? tenuidiscus (Hall), Wachsmuth and 
Springer, 5765a. 
uniformis (S. A. Miller), Wachsmuth and 
Springer, 5765a. 
? whitei (Hall), Wachsmuth and 
Springer, 5765a. 
whitfieldi (Hall), Wachsmuth and 
Springer, 5765a. 
Periechocrinus Austin, Weller, 6002. 
chicagoensis n. sp., Weller, 6002. 
egani (S. A. Miller), Weller, 6002. 
infelix (Winchell and Marcy), Weller, 
6002. 
Paleontology— Continued. 
Genera and species described — Continued. 
Periechocrinus marcouanus (W. and M.), 
Weller, 6002. 
necis (Winchell and Marcy), Weller, 6002. 
uniformis (S. A. Miller), Weller, 6002. 
whitei, Whitfield, 6098. 
Peripetoceras n. gen., Hyatt, 2819. 
frieslebeni Geinitz, Hyatt, 2819. 
Periploma (?) alta, Whitfield, 6101. 
butleriana n. sp., Aldrich, 73. 
butleriana, Harris, 2313. 
collardi n. sp., Harris, 2307. 
sp., Harris, 2315. 
Periptychus brabensis Cope, Osborn and 
Earle, 4191. 
carinidens Cope, Matthew, 3801. 
coarctatus Cope, Matthew, 3801. 
coarctatus Cope, Osborn and Earle, 4191. 
rhabdodon (Cope), Matthew, 3801. 
rhabdodon Cope, Osborn and Earle, 4191. 
Peiischodomus ?? illinoisensis Worthen and 
Miller, Keyes, 3077. 
Perisoonia lesquereuxii Knowlton, New- 
berry, 4080. 
spatulata Hollick n. sp., Newberry, 4080. 
Perisphinctes alamitosensis n. sp., Aguilera, 
57. 
cf. balderus Oppel, Aguilera, 57. 
colfaxi, Hyatt, 2818. 
colubrinus (Reinecke), Aguilera, 57. 
cf. colubrinus (Reinecke), Aguilera, 57. 
dolfusi n. sp., Aguilera, 57. 
felixi n. sp., Aguilera, 57. 
filiplex (?), Hyatt, 2818. 
flexicostatus n. sp., Aguilera, 57. 
lauri n. sp., Aguilera, 57. 
lenki n. sp., Aguilera, 57. 
mazapilensis n. sp., Aguilera, 57. 
monserrati n. sp., Aguilera, 57. 
muhlbachi n. sp., Hyatt, 2818. 
potosinus n. sp., Aguilera, 57. 
pouzinensis Toucas, Aguilera, 57. 
cf. pouzinensis Toucas, Aguilera, 57. 
skidegatensis Whiteaves, Whiteaves, 
6095a. 
transitorius ? Oppel. Aguilera, 57. 
virgulatiformis n. sp., Hyatt, 2818. 
sp.?, Aguilera, 57. 
Perissodon Conrad, Whitfield, 6101. 
Perissolax blakei (Conrad), Stanton, 5198. 
dubia, Whitfield, 6097. 
trivola, WhitfjBd, 6097. 
Perna cornelliana n. sp., Harris, 2310. 
torta, Say, 4812. 
torta, Whitfield, 6101. 
Pernopecten cooperensis (Shumard), Weller, 
5994. 
? ? sp., Weller, 6006. 
Peronosporites globosus n. sp., Simpson, 3570. 
minutus n. sp., Simpson, 3570. 
ramosus n. sp., Simpson, 3570. 
Perplicaria Dall, Dall, 1259. 
perplexa n. sp., Dall, 1259. 
Persea dilleri, Knowlton, 3235. 
hayana n. sp., Lesquereux, 3470. 
leconteana Lesq., Lesquereux, 3470. 
