278  Field  Columbian  Museum — Reports,  Vol.  i. 
and  Loup  Fork  ages.  I  was  ably  assisted  in  the  work  of  collecting  by 
Mr.  E.  S.  Riggs,  and  about  three  months  were  spent  by  the  party  in 
the  field.  The  work  was  conducted  during  the  first  seven  weeks  in 
the  Bad  Lands  of  South  Dakota,  after  which  the  "Corkscrew"  beds 
near  Harrison,  Nebraska,  were  visited.  The  party  then  explored  the 
escarpments  of  the  Deep  River  beds  near  White  Sulphur  Springs, 
Montana,  and  the  remainder  of  the  time  available  was  spent  in  the 
Hat  Creek  basin  of  Wyoming.  While  the  material  is  as  yet  too 
largely  in  the  matrix  to  be  accurately  reported  upon,  the  ex- 
pedition may  be  characterized  as  remarkably  successful.  The 
amount  and  quality  of  the  material  collected  are  such  as  amply  to 
repay  for  the  outlay,  and  it  was  clearly  demonstrated  that  the  material 
could  be  secured  by  collection  in  the  field  far  more  profitably  than  by 
purchase.  The  quantity  of  material  obtained  for  a  given  outlay  was 
larger.  The  work  of  collection  was  directed  towards  a  needed  kind 
of  material,  and  details  of  scientific  value  were  noted  which  could 
not  be  gained  with  a  purchased  collection.  Among  the  specimens 
secured  were  a  nearly  complete  skeleton  of  Titanotherium,  a  large 
skull,  with  jaws  and  thirteen  vertebrae,  three  skulls  and  many  miscel- 
laneous bones  of  animals  of  the  same  genus;  two  skulls,  jaws,  and 
leg  bones  of  Aceratherium;  a  probably  complete  skeleton  of  Poebro- 
therium  ;  a  skull  of  Protoceras  ;  twenty-fives  kulls,  some  with  jaws, 
and  leg  bones,  of  Leptauchenia,  and  about  twenty-five  skulls  each 
of  species  of  Eporeodon  and  Oreodon  ;  a  skull,  jaws,  vertebras,  and 
leg  bones  of  Cynodesmus;  skulls  and  miscellaneous  bones  of  Hyra- 
codon,  Mesohippus,  Hyaenodon,  Daphaenus,  and  Leptomeryx,  and 
representative  bones  of  three  genera  of  rodents.  These  specimens 
will  be  cleaned  and  mounted  during  the  winter  months,  and  from 
them  it  will  soon  be  possible  to  make  a  creditable  exhibit,  as  a  begin- 
ning of  a  collection  of  ancient  vertebrates.  Besides  the  main  work  of 
the  expedition,  many  auxiliary  results  of  value  were  gained.  From 
the  11  Corkscrew "  beds  of  western  Nebraska  five  fine  specimens  of 
the  remarkable  Daemonelix,  or  "devil's  corkscrew,"  were  secured. 
These  specimens  have  spirals  three  to  eight  feet  in  length,  with 
rhizomes  attached.  From  the  Fort  Pierre  beds  of  South  Dakota  a 
choice  collection  of  the  richly-colored  amber  barite,  golden  calcite, 
and  chalcedony  geodes,  which  occur  in  the  concretions  of  these  beds, 
was  obtained.  About  one  hundred  photographs  illustrating  geologic 
and  scenic  features  were  taken,  and  about  forty  specimens  of  plants 
showing  the  character  of  the  flora  of  the  region  were  collected. 
During  the  stay  of  the  party  in  South  Dakota  I  visited  the  principal 
mining  camps  in  the  vicinity  of  Deadwood,  and  obtained  arepresenta- 
