warman.]  MONOGRAPHS.  35 
XV.  The  Potomac  or  younger  Mesozoic  flora,  by  William  Morris  Fontaine. 
1889.  2  pts.  xiv,  377  pp. ;  x,  180 11. ,  180  pis.  Text  and  plates  bound  separately. 
Price,  $2.50. 
XVI.  The  Paleozoic  fishes  of  North  America,  by  John  Strong  Newberrv.  1889. 
340  pp. ,  53  pis.     Price,  $1 .  00. 
XVII.  The  flora  of  the  Dakota  group,  a  posthumous  work,  by  Leo  Lesque- 
reux.     Edited  by  F.  H.  Knowlton.     1891.     400  pp.,  66  pis.     Price,  $1.10. 
XVIII.  Gasteropoda  and  Cephalopoda  of  the  Raritan  clays  and  greensand 
marls  of  New  Jersey,  by  Robert  Parr  Whitfield.  1892.  402  pp.,  50  pis.  Price, 
$1.00. 
XIX.  The  Penokee  iron-bearing  series  of  Michigan  and  Wisconsin,  by  Roland 
Duer  Irving  and  Charles  Richard  Van  Hise.  1892.  xv,  534  pp.,  37  pis.  and  mapa 
Price,  $1.70. 
X  X.  ( reologyof  the  Eureka  district,  Nevada,  with  an  atlas,  by  Arnold  Hague. 
L892.     Kvii,  419  pp.,  8  pis.  and  maps,  and  atlas  of  13  sheets  folio.     Price,  $5.25. 
XXI.  The  Tertiary  rhynchophorous  Coleoptera  of  the  United  States,  by 
Samuel  Hubbard  Scudder.     L893.     xi,  206  pp.,  12  pis.     Price,  90  cents. 
XXII.  A  manual  of  topographic  methods,  by  Henry  Gannett,  chief  topog- 
rapher.    1893.     xiv,  300  pp.,  18  pis.     Price,  si. no. 
XXIII.  I  reology  of  the  Green  Mountains  in  Massachusetts,  by  Raphael  Pum- 
pelly,  J.   E.  Wolff,  and  T.  Nelson   Dale.     L894.     xiv,  206  pp. ,  23  pis.  and  maps. 
Price,  $1.30. 
XXIV.  Mollusca  and  Crustacea  of  the  Miocene  formations  of  New  Jersey,  by 
Robert  Parr  Whitfield.     L894.     L95  pp.,  24  pis.     Price,  90  cents. 
XXV.  The  glacial  Lake  Agassiz,  by  Warren  CJpham.  1895.  xxiv,  t\')>>  pp., 
38  pis.  and  maps.     Price.  $1.70. 
XXVI.  The  flora  of  the  Amboy  clays,  by  John  Strong  Newberry;  a  posthu- 
mous work,  edited  by  Arthur  Hollick.     L895.     260  pp.,  58  pis.     Price,  $1.00. 
XXVII.  Geology  of  the  Denver  Basin  in  Colorado,  by  Samuel  Franklin  Em- 
mons, Whitman  ( 'ross,  and  George  Homana  Eldridge.  L896.  xxi,  556  pp., 
31  pis.  and  maps.     Price,  $1 .50. 
XXVIII.  The  Marquette  iron-bearing  district  of  Michigan,  with  an  atlas,  by 
Charles  Richard  Van  Hise  and  William  Shirley  Bayley,  including  a  chapter  on 
the  Republic  trough,  by  Henry  Lloyd  Smyth.  L897.  xxvii,  608  pp.,  35  pis.  and 
maps,  and  atlas  of  :!<)  sheets  folio.      Price  $5.75. 
XXIX.  Geology  of  Old  Hampshire  County,  Massachusetts,  comprising  Frank- 
lin, Hampshire,  and  Hampden  counties,  by  Benjamin  Kendall  Emerson.  1898. 
x\i,  790  pp.,  35  pis.  and  maps.      Price,  si. '.in. 
XXX.  Fossil  Medusae,  by  Charles  Doolittle  Walcott.  1898.  ix,  201  pp.,  47 
pis.     Price,  SI. 50. 
XXXI.  Geology  of  the  Aspen  mining  district,  Colorado,  with  atlas,  by  Josiah 
Edward  Spun-.  Samuel  Franklin  Emmons,  geologist  in  charge.  1898.  xxxv, 
260  pp.,  43  pis.,  and  atlas  of  30  sheets  folio.     Price,  $3.60. 
X  XXII.  Geology  of  the  Yellowstone  National  Park.  Part  II,  Descriptive  geol- 
ogy, petrography,  and  paleontology,  by  Arnold  Hague,  J.  P.  Iddings,W.  H.  Weed, 
C.  D.  Walcott,  G.  H.  Girty,  T.  W.  Stanton,  and  F.  H.  Knowlton.  1899.  xvih 
893  pp.,  121  pis.  and  maps.     Price,  $2.45.     (Part  I  not  yet  published.) 
X  XXIII.  Geology  of  the  Narragansett  Basin,  by  N.  S.  Shaler,  J.  B.  Woodworth, 
and  A.  F.  Foerste.     1899.     xx,  402  pp.,  31  pis.  and  maps.     Price,  $1.00. 
X  XXIV.  The  glacial  gravels  of  Maine  and  their  associated  deposits,  by  George 
H.  Stone.     1899.     xiii,  499  pp.,  52  pis.  and  maps.     Price,  $1.30. 
XXXV.  The  later  extinct  floras  of  North  America,  by  John  Strong  Newberry ; 
a  posthumous  work,  edited  by  Arthur  Hollick.  1898.  xvii,  295  pp.,  68  pis. 
Price,  $1.25. 
