﻿Yol. 
  53.] 
  FOSSILS 
  FROM 
  THE 
  IfOKTE 
  SLATES, 
  ETC. 
  447 
  

  

  Dalmanites 
  sp. 
  (PI. 
  XXXI. 
  figs. 
  1-3.) 
  

  

  Locality. 
  Treborough. 
  Two 
  heads, 
  1 
  thorax, 
  1 
  tail. 
  

  

  Size. 
  A 
  distorted 
  head 
  is 
  about 
  15 
  mm. 
  long, 
  and 
  21 
  mm. 
  wide. 
  

  

  Description. 
  Head 
  probably 
  rather 
  elongate, 
  semi-oval. 
  Glabella 
  

   large 
  ; 
  anterior 
  lobe 
  tuberculate, 
  subcircular, 
  occupying 
  the 
  whole 
  

   front 
  of 
  the 
  head 
  ; 
  lateral 
  furrows 
  short 
  and 
  indistinct 
  ; 
  genal 
  

   angles 
  apparently 
  produced 
  into 
  spines 
  of 
  unknown 
  but 
  probably 
  

   considerable 
  length. 
  Eyes 
  extremely 
  large, 
  prominent, 
  with 
  more 
  

   than 
  100 
  lenses 
  in 
  18 
  vertical 
  rows. 
  Neck-lobe 
  rather 
  narrow 
  and 
  

   straight. 
  

  

  Thorax 
  with 
  narrow, 
  raised 
  axis. 
  Pleurae 
  about 
  half 
  as 
  wide 
  

   again 
  as 
  the 
  axis, 
  curved 
  gently 
  backward, 
  and 
  then 
  slightly 
  

   recurved 
  at 
  the 
  fulcrum, 
  divided 
  by 
  a 
  strong 
  furrow. 
  

  

  Tail 
  with 
  a 
  very 
  narrow, 
  tapering 
  axis, 
  reaching 
  to 
  the 
  border, 
  

   but 
  apparently 
  not 
  produced 
  beyond 
  it, 
  having 
  probably 
  10 
  or 
  12 
  

   ribs, 
  each 
  bearing 
  a 
  lateral 
  tubercle. 
  Lateral 
  lobes 
  with 
  5 
  or 
  6 
  

   furrowed 
  ribs. 
  Border 
  narrow. 
  

  

  Remarks. 
  The 
  evidence 
  given 
  by 
  these 
  somewhat 
  imperfect 
  

   specimens 
  is 
  rather 
  unsatisfactory. 
  Though 
  much 
  like 
  Pliacops 
  

   StoJcesii 
  (from 
  the 
  Silurian) 
  or 
  Ph. 
  Muslunii 
  in 
  general 
  look, 
  the 
  

   shape 
  of 
  the 
  base 
  of 
  the 
  head 
  and 
  the 
  apparent 
  existence 
  of 
  a 
  

   cheek-spine 
  seem 
  to 
  show 
  that 
  they 
  really 
  belong 
  to 
  Dalmanites. 
  

   I 
  do 
  not 
  know 
  any 
  German 
  or 
  American 
  species 
  of 
  that 
  genus 
  

   that 
  appear 
  to 
  be 
  identical 
  with 
  them. 
  Some 
  Bohemian 
  species 
  

   approach 
  them 
  in 
  the 
  size 
  of 
  the 
  eye. 
  

  

  HoMALONOTUS 
  sp. 
  (PL 
  XXXI. 
  fig. 
  4.) 
  

  

  Locality. 
  Treborough. 
  

  

  Two 
  fragmental 
  specimens, 
  insufficient 
  for 
  specific 
  comparison, 
  

   appear 
  to 
  belong 
  to 
  this 
  genus. 
  Of 
  these 
  one 
  is 
  part 
  of 
  the 
  side 
  of 
  

   a 
  thorax, 
  showing 
  8 
  ribs, 
  which 
  seem 
  deeply 
  and 
  obliquely 
  grooved 
  

   near 
  their 
  margins, 
  which 
  are 
  straight 
  and 
  perpendicular, 
  and 
  have 
  

   signs 
  of 
  a 
  tubercle 
  near 
  them. 
  The 
  other 
  is 
  still 
  more 
  indistinct, 
  

   and 
  can 
  only 
  be 
  said 
  to 
  have 
  a 
  strong 
  likeness 
  to 
  an 
  oblique 
  view 
  

   of 
  the 
  side 
  of 
  such 
  an 
  animal 
  without 
  showing 
  details 
  ; 
  in 
  it 
  a 
  

   smooth 
  triangular 
  surface 
  may 
  represent 
  the 
  cheek, 
  and 
  there 
  seem 
  

   to 
  be 
  11 
  long 
  ribs, 
  with 
  no 
  defined 
  axis, 
  and 
  also 
  indications 
  of 
  a 
  

   distorted 
  tail. 
  

  

  Cypkicakdinia 
  ? 
  sp. 
  (PL 
  XXXI. 
  fig. 
  5.) 
  

  

  Locality. 
  Treborough. 
  One 
  specimen. 
  

  

  Size. 
  7 
  mm. 
  high, 
  14 
  mm. 
  long. 
  

  

  Description. 
  Transverse, 
  suboblong. 
  Upper 
  margin 
  very 
  long, 
  

   nearly 
  straight, 
  punctated 
  (apparently 
  by 
  the 
  ends 
  of 
  the 
  ribs). 
  

   Posterior 
  margin 
  straight, 
  slightly 
  oblique. 
  Postero-inferior 
  corner 
  

   nearly 
  subangular. 
  Inferior 
  margin 
  slightly 
  convex, 
  curving 
  rapidly 
  

   in 
  front. 
  Anterior 
  side 
  only 
  about 
  f 
  the 
  height 
  of 
  the 
  posterior 
  side. 
  

   Contour 
  of 
  back 
  flattish 
  generally, 
  but 
  definitely 
  convex 
  below. 
  

   Surface 
  marked 
  by 
  20 
  linear 
  ridges, 
  which 
  are 
  parallel 
  to 
  the 
  rear 
  

  

  