﻿132 
  Twenty-eighth 
  Report 
  ok 
  the 
  State 
  Museum. 
  

  

  the 
  genus 
  Balanocrinus 
  of 
  Troost. 
  The 
  latter 
  name 
  was 
  

   first 
  published 
  in 
  Troost' 
  s 
  Catalogue 
  in 
  1849. 
  The 
  name 
  

   Lampterocrinus 
  was 
  published 
  in 
  I860, 
  and 
  in 
  that 
  year 
  I 
  

   recognized 
  the 
  genus 
  Balanocrinus 
  and 
  described 
  a 
  species 
  

   (B. 
  inflatus) 
  from 
  the 
  Niagara 
  group 
  of 
  Wisconsin.* 
  

  

  The 
  group 
  of 
  species 
  referable 
  to 
  these 
  genera 
  is 
  a 
  very 
  

   interesting 
  one, 
  and 
  the 
  following 
  contribute 
  some 
  further 
  

   information 
  in 
  relation 
  to 
  their 
  geological 
  distribution. 
  

  

  GLYPTOCRINUS 
  Hall. 
  

   Glyptocrintjs 
  Carleyi. 
  

  

  Plate 
  14, 
  Figs. 
  7-10. 
  

  

  Qlyptocrinus 
  Carleyi 
  Hall. 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  203. 
  Abstract, 
  p. 
  9; 
  May, 
  

   1863. 
  

  

  General 
  form 
  of 
  body 
  pentangularly 
  turbinate, 
  having 
  the 
  

   angles 
  coincident 
  with 
  the 
  rays 
  and 
  marked 
  by 
  a 
  rounded 
  

   ridge, 
  the 
  intermediate 
  spaces 
  concave. 
  The 
  upper 
  disc 
  of 
  

   the 
  column 
  is 
  marked 
  by 
  five 
  divisions 
  indicating 
  the 
  unde- 
  

   veloped 
  basal 
  plates 
  ; 
  subradial 
  plates 
  (basal 
  plates 
  of 
  the 
  

   generic 
  description), 
  wider 
  than 
  high, 
  each 
  one 
  marked 
  by 
  a 
  

   single 
  or 
  double 
  rounded 
  radiating 
  ridge. 
  Radial 
  series 
  

   strongly 
  marked 
  by 
  a 
  longitudinal 
  rounded 
  ridge, 
  which 
  

   bifurcates 
  with 
  the 
  first 
  and 
  second 
  division 
  of 
  the 
  ray, 
  giving 
  

   from 
  four 
  to 
  eight 
  arms 
  to 
  each 
  ray 
  as 
  it 
  leaves 
  the 
  body. 
  

   Besides 
  the 
  longitudinal 
  ridge, 
  the 
  plates 
  of 
  the 
  radial, 
  inter- 
  

   radial 
  and 
  supraradial 
  series 
  are 
  marked 
  by 
  sharp 
  radiating 
  

   ridges, 
  with 
  the 
  intermediate 
  spaces 
  finely 
  granulose. 
  Rays 
  

   bifurcating 
  on 
  the 
  third 
  or 
  fourth 
  plate, 
  and 
  again 
  on 
  the 
  

   second 
  or 
  third 
  above, 
  and 
  on 
  the 
  sixth 
  or 
  seventh 
  of 
  the 
  

   supraradial 
  series. 
  Interradial 
  plates, 
  eight 
  or 
  more 
  (prob- 
  

   ably 
  ten 
  or 
  twelve), 
  with 
  many 
  small 
  intersupraradials. 
  

  

  Summit 
  flat, 
  depressed 
  convex, 
  or 
  slightly 
  concave, 
  finely 
  

   pustulose, 
  composed 
  of 
  numerous 
  small 
  plates. 
  Proboscis(?) 
  

   small, 
  subcentral. 
  

  

  In 
  form 
  this 
  species 
  resembles 
  the 
  G. 
  decadactylus 
  of 
  the 
  

   Lower 
  Silurian 
  strata, 
  but 
  is 
  proportionally 
  shorter 
  and 
  a 
  lit- 
  

   tle 
  more 
  rapidly 
  expanding. 
  The 
  radiating 
  ridges 
  upon 
  the 
  

   plates 
  are 
  thinner 
  and 
  sharper, 
  and 
  the 
  intermediate 
  spaces 
  

   more 
  strongly 
  granulose. 
  The 
  column 
  and 
  arms 
  are 
  unknown. 
  

  

  ♦Published 
  in 
  the 
  Report 
  of 
  Progress 
  of 
  the 
  Geological 
  Survey 
  of 
  TFisconsm. 
  1861. 
  

  

  