II  ADVERTISEMENT. 
VII.  Silver-Lead  Deposits  of  Eureka,  Nevada,  by  Joseph  Story  Curtis.  1884.  4°.  xiii,  200  pp.  16 
pi.    Price  $1.20. 
VIII.  Paleontology  of  the  Eureka  District,  by  Charles  Doolittle  Walcott.  1884.  4°.  xiii,  298  pp. 
24  1.    24  pi.    Price  $1.10. 
IX.  Brachiopoda  and  Lamellibranchiata  of  the  Raritan  Clays  and  Greensand  Marls  of  New  Jersey, 
by  Robert  P.  Whitfield.    1885.    4°.    xx,  338  pp.     35  pi.     1  map.     Price  $1.15. 
X.  Dinocerata.  A  Monograph  of  an  Extinct  Order  of  Gigantic  Mammals,  by  Othniel  Charles  Marsh. 
1886.    4°.    xviii,  243  pp.     56  1.     56  pi.     Price  $2.70. 
XI.  Geological  History  of  Lake  Lahontan,  a  Quaternary  Lake  of  Northwestern  Nevada,  by  Israel 
Cook  Russell.    1885.    4°.     xiv,  288  pp.     46  pi.  and  maps.    Price  $1.75. 
XII.  Geology  and  Mining  Industry  of  Leadville,  Colorado,  with  atlas,  by  Samuel  Franklin  Emmons. 
1886.    4°.    xxix,  770  pp.    45  pi.  and  atlas  of  35  sheets  folio.    Price  $8.40. 
XIII.  Geology  of  the  Quicksilver  Deposits  of  the  Pacific  Slope,  with  atlas,  by  George  F.  Becker. 
1888.    4°.    xix,  486  pp.    7  pi.  and  atlas  of  14  sheets  folio.    Price  $2.00. 
XIV.  Fossil  Fishes  and  Fossil  Plants  of  the  Triassic  Hocks  of  New  Jersey  and  the  Connecticut  Val- 
ley, by  John  S.  Newberry.     1888.     4°.    xiv,  152  pp.    26  pi.     Price  $1.00. 
XV.  The  Potomac  or  Younger  Mesozoic  Flora,  by  William  Morris  Fontaine.  1889.  4°.  xiv,  377 
pp.    180  pi.     Text  and  plates  bound  separately.    Price  $2.50. 
XVI.  The  Paleozoic  Fishes  of  North  America,  by  John  Strong  Newberry.  1889.  4°.  340  pp.  53  pi. 
Price  $1.00. 
XVII.  The  Flora  of  the  Dakota  Group,  a  posthumous  work,  by  Leo  Lesquereux.  Edited  by  F.  H. 
Knowlton.     1891.    4°.    400  pp.    66  pi.     Price  $1.10. 
XVIII.  Gasteropoda  and  Cephalopoda  of  the  Raritan  Clays  and  Greensand  Marls  of  New  Jersey, 
by  Robert  P.  Whitfield.     1891.    4°.    402  pp.     50  pi.    Price  $1.00. 
In  press: 
XIX.  The  Penokee  Iron-Bearing  Series  of  Northern  Wisconsin  and  Michigan,  by  Roland  D.  Irving 
and  C.  R.  Van  Hise. 
XX.  Geology  of  the  Eureka  District,  Nevada,  with  atlas,  by  Arnold  Hague.  1892.  4°.  419  pp.  8  pi. 
In  preparation : 
XXI.  The  Tertiary  Rhynchophorous  Coleoptera  of  North  America,  by  Samuel  Hubbard  Scudder. 
XXII.  A  Manual  of  Topographic  Methods,  by  Henry  Gannett,  chief  topographer. 
XXIII.  Geology  of  the  Green  Mountains  in  Massachusetts,  by  Raphael  Pumpelly,  J.  E.  Wolff, 
T.  Nelson  Dale,  and  Bayard  T.  Putnam. 
Mullusca  and  Crustacea  of  the  Miocene  Formations  of  New  Jersey,  by  R.  P.  Whitfield. 
—  Saurbpoda,  by  O.  C.  Marsh. 
—  Stegosauria,  by  O.  C.  Marsh. 
—  Biontotheridae,  by  O.  C.  Marsh. 
—  Report  on  the  Denver  Coal  Basin,  by  S.  F.  Emmons. 
— -  Report  on  Silver  Cliff  and  Ten-Mile  Mining  Districts,  Colorado,  by  S.  F.  Emmons. 
—  The  Glacial  Lake  Agassiz,  by  Warren  Upham. 
BULLETINS. 
1.  On  Hypersthene-Andesite  and  on  Triclinic  Pyroxene  in  Augitic  Rocks,  by  Whitman  Cross,  with  a 
Geological  Sketch  of  Buffalo  Peaks,  Colorado,  by  S.  F.  Emmons.    1883.    8°.    42  pp.    2  pi.    Price  10  ceuts. 
2.  Gold  and  Silver  Conversion  Tables,  giving  the  coining  values  of  troy  ounces  of  fine  metal,  etc.,  com 
puted  by  Albert  Williams,  jr.    1883.    8°.    8  pp.    Price  5  cents. 
3.  On  the  Fossil  Faunas  of  the  Upper  Devonian,  along  the  meridian  of  76°  30',  from  Tompkins  County, 
New  York,  to  Bradford  County,  Pennsylvania,  by  Henry  S.Williams.    1884.    8°.    36  pp.    Price  5  cents. 
4.  On  Mesozoic  Fossils,  by  Charles  A.  White.    1884.    8°.    36  pp.    9  pi.    Price  5  cents. 
5.  A  Dictionary  of  Altitudes  in  the  United  States,  compiled  by  Henry  Gannett.  1884.  8°.  325  pp. 
Price  20  cents. 
6.  Elevations  in  the  Dominion  of  Canada,  by  J.  W.  Spencer.    1884.    8°.    43  pp.    Price  5  cents. 
7.  Mapoteca  Geologica  Americana.  A  Catalogue  ot  Geological  Maps  of  America  (North  and  South), 
1752-1881,  in  geographic  and  chronologic  order,  by  Jules  Marcou  and  John  Belknap  Marcou.  1884. 
8°.    184  pp.    Price  10  cents. 
8.  On  Secondary  Enlargements  of  Mineral  Fragments  in  Certain  Rocks,  by  R.  D.  Irving  and  C.  R. 
Van  Hise.     1884.    8°.    56  pp.    6  pi.     Price  10  cents. 
9.  A  report  of  work  done  in  the  Washington  Laboratory  during'the  fiscal  year  1883-'84.  F.  W.  Clarke, 
chief  chemist.     T.  M.  Chatard,  assistant  chemist.    1884.    8°.    40  pp.    Price  5  cents. 
10.  On  the  Cambrian  Faunas  of  North  America.  Preliminary  studies,  by  Charles  Doolittle  Walcott. 
1884.    8°.    74  pp.    10  pi.    Price  5  cents. 
11.  On  the  Quaternary  and  Recent  Mollusca  of  the  Great  Basin;  with  Descriptions  of  New  Forms, 
by  R.  Ellsworth  Call.  Introduced  by  a  sketch  of  the  Quaternary  Lakes  of  the  Great  Basin,  by  G.  K. 
Gilbert.    1884.    8°.    66  pp.    6  pi.    Price  5  cents. 
12.  A  Crystallographic  Study  of  the  Thinolite  of  Lake  Lahontan,  by  Edward  S.  Dana.  1884.  8°. 
34  pp.    3  pi.    Price  5  cents. 
13.  Boundaries  of  the  United  States  and  of  the  several  States  and  Territories,  with  a  Historical 
Sketch  of  the  Territorial  Changes,  by  Henry  Gannett.     1885.    8°.     135  pp.     Price  10  cents. 
