628 
INDEX    TO    NORTH    AMERICAN    GEOLOGY 
Paleontology — Continued. 
Genera  and  species  described — Continued. 
Acervularia  Schweigger,  Lambe,  2. 
davidsoni      Milne      Edwards      and 
Haime,  Lambe,  2. 
gracilis  Billings   (sp.),  Lambe,   2. 
Acheloma,  Broili,  2. 
Acbitherium  minimus  n.  sp.,  Douglass, 
1, 
Acidaspis  obsoleta  n.  sp.,  Van  Ingen,  2. 
quinq  espiiosa     Salter-Lake,     Van- 
Inge  n.  2. 
whitfieldi     n.     sp.,     Hitchcock     (C. 
H.),  2. 
Acidota    crenata    Fabr.,    var.    nigra,    n. 
var.,  Scudder,  1. 
Acila  II.  and  A.  Adams,  Arnold,  2. 
Acipenser  albertensis  n.  sp.,  Lambe,  3. 
Ac  isina      stevensiana      Meek      and 
Worthen?,  Girty,  3. 
Acmea  Eschscholtz,  Arnold,  2. 
cerrillosensis   n.   sp.,   Johnson    (D. 
W.),   5. 
depicta  Hinds,  Arnold,  2. 
insessa  Hinds,  Arnold,  2. 
instabilis  Gould,  Arnold.   2. 
mitra  Eschscholtz,  Arnold,  2. 
paleacea  Gould,  Arnold,  2. 
•pelta  Eschscholtz,   Arnold.   L'. 
spectrum  (Nuttall)   Reeve,  Arnold, 
2. 
Acompsoceras  n.  gen.,  Hyatt,  1. 
Aconeceras  n.  gen.,  Hyatt,  1. 
Acrochordiceras      Hyatt,      Hyatt      and 
Smith.    1. 
hyatti   Meek,   Hyatt  and  Smith,  1. 
Acrocrinus    amphora     Wachsmuth    and 
Springer,  Grabau,  8. 
cassedayi  Lyon,  Rowley.  Greene,  2. 
cassedayi,  var.  charlestownensis,  n. 
var.   (Rowley),  Greene,  2. 
depressus  n.  sp.   (Rowley) ,  Greene, 
2. 
wachsmuthi   n.    sp.,   Rowley,    1. 
Acrophyllum    Thomson    and    Nicholson, 
Lambe,  3. 
oneidaense    Billings    (sp.),   Lambe, 
3. 
rugosum  n.  sp..  Greene,  1. 
Acrostichopteris     parvifolia     Fontaine. 
Fontaine.  5 
Acrostichum  haddeni  n.  sp.,  Ilollick,  5. 
Aciothee   at  a  ia   n.   sp.,   MatF  ew    <G. 
P.),   12,   20. 
avia  n.  sp.,  Matthew  (G.  F.),  2,  12, 
20. 
avia-puteis   n.    mut..    Matthew    (G. 
F.),  12,  20. 
?  minuta  n.  sp..   Walcott,  12. 
proavia  n.  sp.,  Matthew  (G.  P.),  2. 
proles  n.  sp.,  Matthew  (G.  P.),  12. 
proles,  Matthew  (G.  F.),  20. 
rams  n.  sp..  Walcott,  12. 
subsidua  White,  Matthew  (G.  F.), 
19, 
Paleontology— Continued. 
Genera  and  species  described — Continued. 
Aerothyra  n.  gen.,  Matthew  (G.  F.),  7, 
10,   20. 
minor  n.   sp.,   Walcott,   12. 
proavia,   Matthew    (G.   F.),   12,20. 
proavia-crassa    n.    mut.,    Matthew 
(G.  F.),  12,  20. 
proavia-prima    n.     mut.,    Matthew 
(G.  F.),  10,  12,  20. 
signata   n.   sp.,   Matthew    (G.    F.), 
12,  20. 
signata-orta.  Matthew   (G.  F.),  12, 
20. 
signata-prima,    Matthew    (G.    P.), 
12,  20. 
signata-sera,  Matthew  (G.  P.),  12, 
20. 
signata-tarda,     Matthew     (G.     F.), 
12,  20. 
Acrotreta  Kutorga,  Walcott,  G. 
argenta  n.  sp.,  Walcott,  6. 
attenuata  Meek,  Walcott,  12. 
attenuata   var.?.   Walcott,   12. 
bailey i,  Matthew,   Wal  ott,   G. 
cf.  baileyi,  Matthew  (G.  F.),  10. 
bisecta  n.  sp.,  Matthew   (G.  F.),9, 
12,  20. 
bisecta  Matthew.  Walcott,  G,  12. 
?  cancellata  n.  sp.,  Walcott,  12. 
concent  iha   n.  sp..   Walcott,  6. 
connla  n.  sp.,  Walcott,  G. 
convex;;   n.  sp.,  Wa'cott,  6. 
curvata  n.  sp.,  Wa:cott,  6. 
detinita  n.  sp.,  Walcctt,  6. 
eggegrundensis     Wiman,    Walcott, 
12. 
emmonsi  n.  sp.,  Walcott,  12. 
gemma  Billings,  Walcctt,  G. 
gemma  var.  depressa  Wa.cott,  Mat- 
thew   (G.  P.),  19. 
gracia  n.  sp.,  Walcott,  G. 
idahoensis  n.  sp.,  Walcott,  6. 
idahoensis  alta  n.  var.,  Walcott,  6. 
idahoensis  sulcata  n.  var.,  Walcott, 
6. 
inflata  Matthew,  Walcott,  6. 
kutorgai  n.  sp.,  Walcott,  6. 
liani  n.  sp.,  Walcott,  12. 
microscopica  missouriensis  n.  var., 
-  Walcott,   G.    • 
microscopica     tetonensis     n.     var., 
Walcott,  6. 
miser  Billings,  Walcott,  6. 
neboensis  n.  sp.,  Walcott.  12. 
nox  n.  sp.,  Walcott,  12. 
ophirensis  n.  sp.,  Walcott.  6. 
ophirensis    rugosus    n.    var.,    Wal- 
cott, 6. 
ovalis  n.  sp.,  Walcott,  6. 
pacifica  n.  sp.,  Walcott,  12. 
papillata  n.  sp.,  Matthew   (G.  P.), 
12,  20. 
papillata    var.    lata.    Matthew    (G. 
F.),  20. 
papilla ta-prima   n.    mut.,   Matthew 
(G.  F.),  12,  20. 
