700 
INDEX    TO    NORTH    AMERICAN    GEOLOGY 
Paleontology— Continued. 
Genera  and  species  described — Continued. 
Planorbis  Guettard,  Arnold,  2. 
Planorbis  Guettard,  Letson,  1. 
bicarinatus  Say,  Letson,  1. 
parvus  Say,  Letson,  1. 
tumidus  Pfeiffer,  Arnold,  2. 
vermicularis  Gould,  Arnold,  2. 
Planorbulina,  d'Orbigny,  Bagg,  6. 
elegans,  Guppy,  4. 
mediterranensis  d'Orbigny,  Bagg,  6. 
Plantaginopsis  n.  gen.,  Fontaine,  5. 
marylandica  n.  sp.,  Fontaine,  5. 
Platacodon  nanus  Marsh,  Hatcher,  3. 
riatanus    aceroides?     (Goppert)     Heer, 
Knowlton,  14. 
eondoni  (Newb.)  Knowlton,  Knowl- 
ton, 14. 
nobilis?  Newb.,  Knowlton,  14. 
Platecarpus,  Sternberg,  5. 
riatidia  marylandica  n.  sp.,  Clark  and 
Martin,  3. 
marylandica  Clark,  Dall,  8. 
Platigonus     Le     Conte,     Matthew    and 
Gidley,  1. 
Platyceras  Conrad,  Girty,  3. 
Platyceras  Conrad,  Grabau,  1. 
angulatum   (Hall),  Grabau,  1. 
amnion  Hall,  Kindle,  1. 
?  arctiostoma  Ulrich,  Kindle,  1. 
arkonense  n.  sp.,  Shimer  and  Gra- 
bau, 1. 
blatchleyi  n.  sp.,  Kindle,  1. 
bucculentum  Hall,  Kindle,  1. 
bucculentum     Hall,      Shimer     and 
Grabau,  1. 
carinatum  Hall,  Kindle,  1. 
circularis  n.  sp.   (Rowley),  Greene, 
2 
?  columbiana  n.  sp.,  Weller,  G. 
compactum  n.  sp.,  Whiteaves,  17. 
compressum  Nettleroth,  Kindle,  1. 
compressum  var.,  Kindle,  1. 
conicum  Hall,  Kindle,  1. 
(Diaphorostoma)  cornutum  Hi- 
singer,  Kindle  and  Breger,  1. 
crassum  Hall  ?,  Kindle,  1. 
cymbula  n.  sp.,  Matthew  (G.  F.),  1. 
dumosum  Conrad,  Kindle,  1. 
dumosum  var.  pileum  n.  var..  Kin- 
dle, 1. 
dumosum  var.  rarispinum  Hall, 
Kindle,  1. 
echinatum  Hall,  Kindle,  1. 
(Orthonychia)  fluctuosum  Ulrich, 
Kindle,  1. 
fornicatum,  Kindle,  1. 
gibbosum  Hall,  Weller,  6. 
linerare  n.  sp.,  Kindle,  1. 
milleri  Nettleroth,  Kindle,  1. 
multispinosum  Meek,  Kindle,  1. 
niagarense  (Hall),  Grabau,  1. 
paralium  White  and  Whitfield?, 
Girty,  3. 
parvum  Swallow,  Girty,  3. 
radiatum  n.  sp.,  Matthew  (G.  F.), 
1. 
Paleontology— Continued. 
Genera  and  species  described — Continued. 
Platyceras  rictum  Hall,  Kindle,  1. 
rictum  var.  spinosa  n.  var.,  Kindle, 
1. 
subcirculare  n.  sp.,  Kindle,  1. 
subspinosum  Hall,  Shimer  and  Gra- 
bau, 1. 
symmetricum  Hall,  Kindle,  1. 
thetis  Hall,  Shimer  and  Grabau,  1. 
thetis  Hall,  Kindle,  1. 
tortuosum  Hall,  Weller,  G. 
transversum   n.   sp.,   Matthew    (G. 
F.),  1. 
ventricosum  Conrad,  Kindle,  1. 
vetulum  n.  sp.,  Sardeson,   1. 
sp.,  Kindle,  1. 
sp.  undet,  Weller,  6. 
Platycrinus   devonicus   n.   sp.,   Rowley, 
Greene,   7. 
hemisphericus,  Grabau,  8. 
huntsvillae  (Troost),  Grabau,  8. 
huntsvillae,  Ulrich,  8. 
Platygyra  Ehrenberg  1834,  Vaughan,  2. 
clivosa       (Ellis      and      Solander), 
Vaughan,  2. 
viridis   (Le  Seur),  Vaughan,  2. 
Platygonus  bicalaratus  Cope,  Gidley,  3. 
compressus  Le  Conte,  Wagner,  1. 
texanus  n.  sp.,  Gidley,  3. 
?  sp.,  Sinclair,  7. 
Platymetopus      minganensis      Billings, 
Raymond   (P.  E.),  5. 
trentonensis  (Con.),  Weller,  G. 
Platynus  exterminatus  n.  sp.,  Scudder, 
1. 
interglacialis  n.  sp.,  Scudder,  1. 
interitus  n.  sp.,  Scudder,  1. 
long«vus  n.  sp.,  Scudder,  1. 
Platyodon   Conrad,   Arnold,    2. 
cancellatus  Conrad,  Arnold,  2. 
Platyostoma  desmatum    (Clarke),  Wel- 
ler, G. 
lineata  Conrad,  Parks,  5. 
lineata  Conrad,  Kindle,  1. 
lineatum  var.  callosum  Hall,  Kin- 
dle, 1. 
nearpassi  n.  sp.,  Weller,  6. 
niagarense  Hall,  Rowley,  Greene,  2. 
pleurotoma  Hall,  Kindle,  1. 
turbinata  Hall,  Kindle,   1. 
turbinata  var.  cochleata,  Kindle,  1. 
ventricosa  Con.,  Weller,  6. 
sp.,  Kindle,  1. 
Platyphyllum   brownianum   Dn.,   White 
(D.),  18. 
Platysomus     circularis     Newberry     and 
Worthen,  Eastman,  10. 
Platystrophia  biforata   Schlotheim   sp., 
Ruedemann,  2. 
biforata,   Cumings,   8. 
biperforata  (Schl.),  Weller,  G. 
costata,  Cumings,  8. 
laticosta,  Cumings,  8. 
lynx,  Cumings,  8. 
