﻿16 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL. 
  MUSEUM 
  vol. 
  6T 
  

  

  MYELODACTYLUS 
  BRIDGEPORTENSIS 
  S. 
  A. 
  Miller 
  

  

  Myelodactylus 
  bridffeportensis, 
  S. 
  A. 
  Miller, 
  Journ. 
  Cin. 
  Soc. 
  Nat. 
  Hint., 
  

   sec. 
  2, 
  vol. 
  3, 
  18S0, 
  p. 
  141, 
  pi. 
  4, 
  figs. 
  2a— 
  e. 
  

  

  MYELODACTYLUS 
  GORBYI 
  S. 
  A. 
  Miller 
  

  

  Myelodactylus 
  gorbyi, 
  S. 
  A. 
  Miller, 
  17th 
  Rep. 
  Geol. 
  Surv. 
  Indiana, 
  1891,. 
  

   p. 
  72, 
  pi. 
  2, 
  figs. 
  6, 
  7. 
  

  

  When 
  describing 
  these 
  species 
  Mr. 
  Miller 
  still 
  clung 
  to 
  the 
  idea 
  

   that 
  they 
  represented 
  the 
  arms 
  of 
  a 
  crinoid, 
  and 
  his 
  statements 
  there- 
  

   fore 
  throw 
  no 
  light 
  upon 
  their 
  specific 
  characters. 
  Both 
  were 
  de- 
  

   scribed 
  from 
  rather 
  poor 
  material, 
  but 
  under 
  the 
  first 
  one, 
  from 
  

   the 
  Racine 
  dolomite 
  of 
  the 
  Chicago 
  area, 
  there 
  is 
  enough 
  detail 
  in 
  

   the 
  figures 
  to 
  show 
  that 
  it 
  is 
  of 
  the 
  type 
  of 
  M. 
  convolutus, 
  having 
  

   paired 
  cirri 
  on 
  every 
  columnal 
  ; 
  and, 
  so 
  far 
  as 
  appears 
  from 
  the 
  speci- 
  

   mens, 
  it 
  should 
  be 
  referred 
  to 
  that 
  species. 
  As 
  to 
  the 
  second 
  species, 
  

   M. 
  gorbyi, 
  said 
  to 
  be 
  from 
  the 
  Niagara 
  limestone 
  near 
  Nashville, 
  

   Tennessee, 
  the 
  single 
  small 
  type 
  specimen 
  as 
  figured 
  shows 
  no 
  diag- 
  

   nostic 
  character 
  whatever. 
  Nor 
  is 
  there 
  any 
  information 
  to 
  indicate 
  

   its 
  exact 
  horizon 
  — 
  there 
  being 
  more 
  than 
  one 
  Niagara 
  formation 
  in 
  

   the 
  vicinity 
  of 
  Nashville. 
  It 
  possibly 
  was 
  from 
  Newsom, 
  which 
  is 
  

   in 
  that 
  vicinity, 
  but 
  whether 
  it 
  belongs 
  to 
  the 
  same 
  species 
  as 
  the 
  

   specimens 
  from 
  that 
  locality 
  mentioned 
  under 
  M. 
  ammonis, 
  can 
  not 
  

   be 
  ascertained 
  from 
  the 
  figure 
  or 
  description, 
  and 
  the 
  location 
  of 
  the 
  

   type 
  is 
  unknown. 
  

  

  MYELODACTYLUS 
  ROTUNDATUS 
  (Foerste) 
  

  

  Eomyelodactylus 
  rotundatus 
  Foerste, 
  Bull. 
  19, 
  Sei. 
  Lab. 
  Denison 
  Univ., 
  

   p. 
  19, 
  pi. 
  1, 
  fig. 
  8; 
  pi. 
  2, 
  fig. 
  3. 
  

  

  Under 
  the 
  name 
  Eomyelodactylus 
  Foerste 
  has 
  described 
  a 
  speci- 
  

   men 
  from 
  the 
  Brassfield 
  formation 
  of 
  Ohio, 
  equivalent 
  to 
  the 
  late 
  

   Clinton, 
  which 
  has 
  all 
  the 
  characters 
  of 
  M. 
  convolutus. 
  As 
  already 
  

   stated, 
  this 
  species 
  occurs 
  both 
  in 
  its 
  typical 
  horizon, 
  the 
  Rochester 
  

   shale, 
  and 
  the 
  underlying 
  Clinton 
  limestone 
  at 
  Lockport, 
  and 
  there- 
  

   fore 
  may 
  well 
  be 
  expected 
  in 
  the 
  Brassfield. 
  

  

  MYELODACTYLUS 
  BRACHIATUS 
  Hall 
  

  

  Plate 
  4, 
  figs. 
  1-10 
  

  

  Myelodactylus 
  brachiatus 
  Hall, 
  Pal. 
  New 
  York, 
  vol. 
  2, 
  1852, 
  p. 
  232, 
  pi. 
  45, 
  

  

  figs. 
  la-e. 
  

   Herpetocrinus 
  brachiatus, 
  Bather, 
  Crinoidea 
  of 
  Gotland, 
  1S93, 
  p. 
  46. 
  

  

  Coil 
  open; 
  circular 
  part 
  of 
  stem 
  very 
  long 
  and 
  slender. 
  Cirri 
  

   few, 
  round, 
  limited 
  to 
  the 
  distal 
  region, 
  and 
  branching; 
  springing 
  

   alternately 
  from 
  the 
  back 
  of 
  the 
  stem 
  at 
  intervals 
  of 
  several 
  col- 
  

  

  