656 
INDEX    TO    NORTH    AMERICAN    GEOLOGY 
Paleontology— Continued . 
Genera  and  species  described — Continued. 
Deltodus     spatulatus      Newberry      and 
Worthen,   Branson,   1. 
Dendrograptus   Hall,    Ruedemann,   8. 
flexuosus  Hall,  Ruedemann,  8. 
fluitans  n.  sp.,  Ruedemann,  8. 
?  succulentus   n.   sp.,   Ruedemann, 
8. 
Dentalium  Linne,  Arnold,  2. 
attenuatum   Say,  Martin,  5. 
caduloide  Dall,  Martin,  5. 
danai  Meyer,   Martin,   5. 
grandaevum  Win.,  Weller,  2. 
hexagonum  Sowerby,  Arnold,  2. 
indianorum  Carpenter.  Arnold,  2. 
minutistriatum    Gabb,    Clark    and 
Martin,  '2. 
mississippiensis    Gabb,    Clark    and 
Martin,   2. 
opaculum  n.  sp.,  Casey.  4. 
polygonum  n.  sp.,  Casey,  4. 
pseudobexagonum  Dall,   Arnold,  2. 
semipolitum     Broderip     and     Sow- 
erby,  Arnold.   2. 
strenuum  n.  sp.,  Casey,  4. 
sublseve  Hall,  Girty,  3. 
zephyrinum  n.  sp.,  Casey,  4. 
sp.,  Dall,  10. 
sp.,  Girty,  3. 
Derbya  Waagen,  Beede,  1. 
bennetti  Hall  and  Clarke,  Beede,  1. 
crassa  (Meek  and  Hayden),  Beede, 
1. 
crassa  Meek  and   Hayden,  dirty,  3. 
cymbula    Hall    and   Clarke,    Beede, 
1. 
keokuk   (Hall),  Beede,  1. 
Desmoceras    ashiandicuin    n.     sp.,    An- 
derson. ::. 
colusaense  n.  sp.,  Anderson,  3. 
dilleri  n.  sp.,  Anderson,  3. 
hoffmanii,  Smitb   (W.  D.),  1. 
hoffmanni  Gabb,  Anderson,  3. 
jugalis  Gabb,  Anderson,  3. 
lecontei  n.  sp.,  Anderson.  ::. 
selwynianum      Whiteaves.      Whit- 
eaves,  12. 
subquadratum  n.   sp..  Anderson,   3. 
sugatum  Forbes,  Anderson,  3. 
voyi  n.  sp.,  Anderson,  3. 
Desmograptus   Hopkinson,    Ruedemann, 
8.  ' 
cancellatus     Hopk.     (sp.),     Ruede- 
mann, 8. 
intricatus  n.  sp.,  Ruedemann,  8. 
Dewalquea  groenlandica  Heer,  Berry,  5. 
Dexiobia  halli  Win.,  Weller,  2. 
ovata   (Hall),  Weller,  2. 
Diacranodus  texensis  Cope,  Broili,  3. 
Diadectidse  Cope,  Case,  12. 
Diamesopora  Hall,  Grabau,  1. 
dicbotoma  Hall,  Grabau,  1. 
Diapborostoma  Fischer,  Grabau,  1. 
desmatum  Clarke,  Shimer,  5. 
lineatum      Conrad,      mut.      belial 
Clarke,  Loomis,  4. 
Paleontology— Continued. 
Genera  and  species  described — Continued. 
Diapborostoma    niagarense    Hall,    Gra- 
bau, 1. 
niagarense  Hall   (sp.),  Clarke  and 
Ruedemann,  1. 
perforatum  n.   sp.,   Whiteaves,   1 7. 
pugnus  n.  sp.,  Clarke,  19. 
(Naticopsis)     rotundatum    n.    sp., 
Clarke,  19. 
Diastoma  Desbayes,  Arnold,  2. 
sp.  indet.,  Arnold,  2. 
Diatryma  gigantea,  Lucas,  15. 
Dicellomus  Hall,  Walcott,  12. 
appalachia  n.  sp.,  Walcott,  12. 
nanus  Meek  and  Hayden,  Walcott, 
12. 
parvus  n.  sp.,  Walcott,  12. 
pectenoides  Whitfield,  Walcott,  12. 
politus  Hall,  Walcott,  12. 
sp.  und.,  Walcott,  12. 
Diceratops  Lull,  Lull,  7. 
Diceratops   hatcheri   Lull,   a.   gen.   and 
sp.,    Hatcher,   22. 
Dichocrinus    inoratus    Wachsmuth    and 
Springer,  Grabau,  8. 
Dichograptus  Salter,  Ruedemann,  8. 
octobrachiatus   Hall    (sp.),   Ruede- 
mann, 8. 
Dicksonia     montanensis     n.     sp.,     Fon- 
taine, 4. 
oregonensis  n.  sp.,  Fontaine,  1,  2. 
pachyphylla  n.  sp.,  Fontaine,  3,   1. 
saportana  Heer,  Fontaine,  2. 
Dicranograptus    ramosus    (Hall),    Wel- 
ler. 6. 
Dictyocephalus  Leidy.  Branson,  2. 
Dictyocoryne  profunda  Ehrenberg,  Mar- 
tin, 8. 
Dictyomella   Hall,  Grabau,  1. 
corallifera    Hall,  Grabau,   1. 
Dictyonella       reticulata      Hall       1868, 
Beecher,  1. 
Dictyonema  Hall,  Grabau,  1. 
Dictyonema   Hall,   Ruedemann,   8. 
flabelliforme        Eicbwald         (sp. ), 
Ruedemann,  8. 
furciferum  n.  sp.,  Ruedemann,  8. 
murrayi  Hall,  Ruedemann,  8. 
rectilineatum  n.  sp.,  Ruedemann,  8. 
retiforme  Hall,  Grabau,  1. 
Dictyopyge  EgertonI  Eastman,  20. 
macrura  W.  C.  Redfield,  Eastman, 
20. 
Dictyoretmon  n.  gen.,  Whitfield,  8. 
burlingtonense  n.  sp.,  Whitfield.  8. 
Didymograptus  McCoy,  Ruedemann.  8. 
acutidens  Lapworth  ms.,  Elles  and 
Wood  em.,  Ruedemann,  8. 
bifidus  Hall  sp.,  Ruedemann,  8. 
(Isograptus)    caduceus   Salter   em. 
Ruedemann,  Ruedemann,  8. 
caduceus    Salter    nanus    n.    mut., 
Ruedemann,   8. 
cuspidatus  n.  sp.,  Ruedemann,  8. 
ellesi  n.  sp.,  Ruedemann,  8. 
extensus  Hall  sp.,  Ruedemann,  8. 
