﻿188 
  Twenty-eighth 
  Repokt 
  on 
  the 
  State 
  Museum. 
  

  

  CYPHASPIS 
  Burmeister. 
  

   Cyphaspis 
  Christyi. 
  

  

  Plate 
  32, 
  Figs. 
  5-7. 
  

  

  Cyphaspis 
  Christyi 
  Hall. 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  220. 
  Abstraot, 
  p. 
  26; 
  

   May, 
  1863. 
  

  

  General 
  form 
  of 
  body 
  elongate- 
  oval, 
  the 
  length 
  nearly 
  twice 
  

   the 
  greatest 
  width 
  of 
  the 
  thorax. 
  

  

  Head 
  semioval, 
  the 
  posterior 
  margin 
  slightly 
  concave, 
  

   highly 
  elevated 
  in 
  the 
  middle, 
  bounded 
  by 
  a 
  proportionally 
  

   strong 
  thickened 
  rim, 
  the 
  posterior 
  angles 
  being 
  prolonged 
  

   into 
  slender 
  spines 
  reaching 
  to 
  the 
  sixth 
  or 
  seventh 
  thoracic 
  

   segment, 
  and 
  slightly 
  divergent. 
  Glabella 
  small, 
  broad-ovate, 
  

   rounded 
  in 
  front 
  and 
  truncate 
  behind, 
  about 
  half 
  the 
  length 
  

   of 
  the 
  head, 
  greatest 
  width 
  anterior 
  to 
  the 
  middle; 
  surface 
  

   convex, 
  very 
  prominent 
  behind, 
  some 
  specimens 
  showing 
  

   faint 
  indications 
  of 
  a 
  pair 
  of 
  short 
  oblique 
  furrows 
  anterior 
  

   to 
  the 
  middle 
  ; 
  near 
  the 
  base 
  on 
  each 
  side 
  a 
  small 
  ovate 
  node 
  

   separated 
  from 
  the 
  glabella 
  by 
  a 
  distinct 
  furrow 
  ; 
  longitudinal 
  

   furrows 
  moderately 
  deep. 
  Eyes 
  small, 
  very 
  prominent 
  and 
  

   rounded, 
  situated 
  about 
  one-third 
  the 
  length 
  of 
  the 
  head 
  from 
  

   the 
  posterior 
  margin 
  ; 
  distance 
  from 
  center 
  to 
  center 
  equal 
  to 
  

   the 
  length 
  of 
  the 
  head 
  forward 
  of 
  the 
  occipital 
  furrow 
  ; 
  the 
  

   surface 
  smooth. 
  Occipital 
  ring 
  narrow, 
  the 
  furrow 
  well 
  

   marked, 
  becoming 
  less 
  distinct 
  toward 
  the 
  posterior 
  cheek 
  

   furrows. 
  Cheeks 
  not 
  prominent 
  except 
  anteriorly. 
  

  

  Thorax 
  with 
  twelve 
  segments, 
  highly 
  convex, 
  deeply 
  lobed, 
  

   lobes 
  nearly 
  equal 
  in 
  the 
  anterior 
  portion 
  ; 
  the 
  axial 
  lobe 
  more 
  

   rapidly 
  tapering 
  posteriorly 
  than 
  the 
  lateral 
  ones, 
  its 
  annula- 
  

   tions 
  curved 
  forward 
  in 
  the 
  middle 
  ; 
  lateral 
  segments 
  curved 
  

   a 
  little 
  backward, 
  the 
  extremities 
  obtusely 
  rounded, 
  some- 
  

   what 
  abruptly 
  bent 
  a 
  little 
  nearer 
  the 
  axial 
  extremity, 
  caus- 
  

   ing 
  an 
  angular 
  ridge 
  along 
  each 
  lateral 
  lobe 
  ; 
  each 
  segment 
  

   marked 
  by 
  a 
  strong 
  longitudinal 
  furrow 
  nearer 
  the 
  anterior 
  

   margin. 
  

  

  Pygidium 
  small, 
  subsemicircular, 
  a 
  little 
  arched 
  forward 
  on 
  

   the 
  anterior 
  border 
  ; 
  axial 
  lobe 
  extending 
  a 
  little 
  more 
  than 
  

   two-thirds 
  the 
  length 
  of 
  the 
  pygidium, 
  rounded 
  at 
  the 
  extrem- 
  

   ity 
  and 
  marked 
  by 
  one 
  distinct 
  and 
  one 
  indistinct 
  annulation, 
  

  

  