﻿SALTER 
  BUDLEIGn 
  SALTEKTON 
  FOSSTLS. 
  291 
  

  

  one 
  particular 
  only 
  does 
  his 
  description 
  need 
  an 
  appendix 
  : 
  he 
  has 
  

   not 
  noticed 
  that 
  the 
  sharp 
  furrows 
  on 
  the 
  sloping 
  sides 
  of 
  the 
  tail 
  

   decussate 
  the 
  incurved 
  margin 
  so 
  much 
  as 
  to 
  produce 
  decided 
  

   serratures 
  all 
  along 
  ; 
  and 
  this 
  character 
  is 
  so 
  rare 
  for 
  Homalonotus 
  

   as 
  to 
  deserve 
  special 
  attention. 
  

  

  As 
  M. 
  Rouault 
  thinks 
  there 
  is 
  no 
  doubt 
  he 
  has 
  the 
  same 
  species 
  

   from 
  the 
  lower 
  or 
  Armorican 
  Sandstone, 
  I 
  can 
  only 
  repeat 
  his 
  

   observation 
  ; 
  but 
  it 
  is 
  not 
  usual 
  for 
  Trilobites 
  of 
  this 
  genus 
  to 
  have 
  a 
  

   great 
  range. 
  The 
  species 
  so 
  quoted 
  by 
  De 
  Verneuil, 
  from 
  the 
  Sierra 
  

   Morena 
  in 
  Spain, 
  is 
  clearly 
  distinct, 
  both 
  as 
  to 
  the 
  head, 
  which 
  has 
  

   much 
  wider 
  cheeks, 
  and 
  the 
  tail, 
  which 
  is 
  triangular 
  and 
  has 
  

   interlined 
  ribs. 
  

  

  I 
  doubt 
  if 
  the 
  fossil 
  represented 
  in 
  our 
  fig. 
  2 
  is 
  distinct 
  ; 
  but 
  the 
  

   outline 
  is 
  squarer, 
  and 
  the 
  front 
  is 
  not 
  so 
  much 
  raised. 
  

  

  2. 
  Homalonotus, 
  sp. 
  PI. 
  XY. 
  fig. 
  3. 
  

  

  This, 
  of 
  which 
  we 
  have 
  but 
  one 
  specimen, 
  is 
  a 
  truly 
  distinct 
  fossil. 
  

   It 
  has 
  a 
  short, 
  broad, 
  convex 
  tail, 
  not 
  a 
  rhomboidal 
  one 
  with 
  steep 
  

   sides 
  as 
  in 
  H. 
  Brongniarti, 
  and 
  the 
  lateral 
  lobes, 
  strongly 
  curved 
  

   down, 
  have 
  also 
  bent 
  ribs, 
  with 
  intermediate 
  furrows 
  near 
  their 
  

   tips. 
  The 
  ribs 
  do 
  not 
  reach 
  the 
  actual 
  margin, 
  which 
  is 
  granular 
  

   and 
  rounded 
  off, 
  not 
  abruptly 
  angular 
  and 
  serrated 
  as 
  in 
  the 
  common 
  

   species. 
  It 
  is 
  hardly 
  complete 
  enough 
  to 
  name, 
  and 
  will 
  probably 
  

   be 
  found 
  in 
  a 
  more 
  perfect 
  state 
  in 
  France 
  ; 
  though 
  M. 
  de 
  Verneuil 
  

   has 
  not 
  recognized 
  it 
  yet. 
  We 
  have 
  a 
  single 
  specimen 
  of 
  the 
  tail 
  of 
  

   a 
  third 
  species 
  of 
  Homalonotus, 
  

  

  3. 
  Calyjlene 
  Teistaisti, 
  Brongniart. 
  PL 
  XV. 
  fig. 
  5. 
  

  

  C. 
  Tristani, 
  Brongn. 
  Crust. 
  Fossiles, 
  pi. 
  1. 
  fig. 
  2, 
  1822; 
  De 
  Ver- 
  

   neuil, 
  Bull. 
  Soc. 
  Geol. 
  Fr. 
  2nd 
  ser. 
  vol. 
  xii. 
  pi. 
  25. 
  fig. 
  3. 
  

  

  Of 
  this 
  we 
  have 
  only 
  the 
  caudal 
  portion, 
  but 
  that 
  is 
  sufficiently 
  

   characteristic. 
  It 
  differs 
  from 
  the 
  C. 
  Arago, 
  a 
  kindred 
  species, 
  by 
  

   having 
  both 
  the 
  axis 
  and 
  sides 
  ribbed 
  throughout. 
  Calymene 
  Arago 
  

   and 
  C. 
  Salteri, 
  Rouault, 
  have 
  the 
  sides 
  of 
  the 
  tail 
  smooth. 
  

  

  4. 
  Phacops 
  ixcerttjs, 
  Deslongchamps. 
  PI. 
  XV. 
  fig. 
  4. 
  

  

  Asaphus 
  incertus, 
  Deslongch. 
  Trans. 
  Soc. 
  Linn, 
  de 
  Calvados, 
  vol. 
  ii. 
  

   p. 
  298. 
  pi. 
  20. 
  fig. 
  5, 
  1825. 
  

  

  Dahnania 
  incerta, 
  Rouault, 
  Bull. 
  S. 
  G. 
  Fr. 
  2nd 
  ser. 
  vol. 
  viii. 
  p. 
  371. 
  

  

  Phacops 
  incertus, 
  Salter, 
  Monograph 
  of 
  British 
  Trilobites, 
  Part 
  1. 
  

   Palgeont. 
  Soc. 
  Trans, 
  pi. 
  1. 
  figs. 
  27, 
  28, 
  1864. 
  

  

  AVe 
  have 
  only 
  the 
  head 
  and 
  tail 
  of 
  this 
  species, 
  but 
  they 
  are 
  so 
  

   much 
  more 
  perfect 
  than 
  the 
  specimen 
  figured 
  by 
  the 
  French 
  author, 
  

   that 
  we 
  are 
  now 
  enabled 
  to 
  see 
  its 
  close 
  relationship 
  to 
  the 
  P. 
  socialis, 
  

   Barr., 
  a 
  species 
  which 
  occurs 
  commonly 
  in 
  the 
  quartz-rocks 
  of 
  

   Bohemia. 
  

  

  P. 
  incertus 
  must 
  have 
  been 
  about 
  2 
  inches 
  long 
  ; 
  and 
  while 
  in 
  the 
  

   inversely 
  pyramidal 
  form 
  of 
  the 
  glabella 
  it 
  resembles 
  P. 
  socialis, 
  it 
  

  

  