﻿•WRIGHT 
  AND 
  ADAMS 
  MALTESE 
  ECHINODEEMS. 
  481 
  

  

  The 
  peristome 
  is 
  large, 
  transversely 
  oval, 
  and 
  surrounded 
  by 
  small 
  

   lobes, 
  between 
  which 
  are 
  narrow 
  phylloidal 
  expansions. 
  The 
  tuber- 
  

   cles 
  are 
  small, 
  and 
  closely 
  set 
  together 
  on 
  the 
  entire 
  upper 
  surface 
  ; 
  

   those 
  on 
  the 
  base 
  are 
  wider 
  and 
  further 
  apart. 
  The 
  small 
  vent 
  is 
  

   quite 
  inframarginal, 
  and 
  situated 
  in 
  the 
  prolonged 
  portion 
  of 
  the 
  

   interambulacrum 
  . 
  

  

  Affinities 
  and 
  differences. 
  — 
  This 
  species 
  differs 
  from 
  E. 
  scutifor- 
  

   mis 
  in 
  having 
  a 
  larger 
  and 
  more 
  discoidal 
  test, 
  as 
  wide 
  as 
  it 
  is 
  long, 
  

   in 
  having 
  its 
  surface 
  covered 
  with 
  small 
  tubercles 
  very 
  closely 
  set 
  

   together 
  on 
  the 
  entire 
  upper 
  surface 
  (those 
  on 
  the 
  base 
  are 
  wider 
  

   and 
  further 
  apart) 
  and 
  in 
  the 
  concave 
  base. 
  The 
  small 
  vent 
  is 
  

   quite 
  inframarginal, 
  and 
  situated 
  in 
  the 
  prolonged 
  portion 
  of 
  the 
  

   interambulacrum 
  . 
  

  

  Stratigrapliical 
  position. 
  — 
  This 
  Urchin 
  has 
  been 
  collected 
  from 
  all 
  

   the 
  strata 
  of 
  No. 
  1, 
  although 
  entire 
  specimens 
  such 
  as 
  those 
  sent 
  are 
  

   rare. 
  It 
  is 
  found 
  likewise 
  in 
  the 
  Molasse 
  (Miocene), 
  St. 
  Jean 
  de 
  

   Boyan 
  (Drome), 
  St. 
  Paul-Trois-Chateaux, 
  Cape 
  Couronne, 
  and 
  Mar- 
  

   tigues, 
  and 
  in 
  the 
  Faluns 
  bleus 
  de 
  Narosse. 
  

  

  Collections. 
  — 
  Museum 
  of 
  the 
  Geological 
  Society 
  ; 
  my 
  cabinet. 
  

  

  17. 
  Echinolampas 
  scutiformis, 
  Leske. 
  PI. 
  XXI. 
  fig. 
  4 
  a, 
  46. 
  

  

  Echinus, 
  Scilla, 
  Corp. 
  Mar. 
  tab. 
  11., 
  upper 
  figure 
  showing 
  the 
  

   dorsum. 
  

  

  Echinoneus 
  scutiformis, 
  Leske 
  apud 
  Klein, 
  1778, 
  p. 
  174. 
  

  

  Galerites 
  scutiformis, 
  Lamarck, 
  Anim. 
  sans 
  Yert., 
  1816, 
  vol. 
  iii. 
  

   p. 
  22. 
  

  

  Ecliinolampas 
  scutiformis, 
  Desmoulins, 
  Etudes 
  sur 
  les 
  Echinides, 
  

   1835, 
  p. 
  348. 
  

  

  Ecliinolampas 
  Francii, 
  Desmoulins, 
  Etudes 
  sur 
  lesEchinides, 
  p. 
  350. 
  

  

  Echinolampas 
  scutiformis, 
  Desor, 
  Synopsis 
  des 
  Echinides 
  Foss., 
  

   1858, 
  p. 
  308. 
  

  

  Test 
  large, 
  oval, 
  wider 
  behind 
  than 
  before 
  ; 
  upper 
  surface 
  convex, 
  

   subcorneal 
  ; 
  ambulacral 
  summit 
  excentral 
  ; 
  petaloid 
  ambulacra 
  equal 
  

   in 
  width, 
  extending 
  over 
  more 
  than 
  half 
  of 
  the 
  dorsum 
  ; 
  sides 
  in- 
  

   flated 
  ; 
  border 
  rounded 
  ; 
  base 
  convex 
  at 
  the 
  sides, 
  concave 
  towards 
  the 
  

   mouth-opening. 
  

   Dimensions. 
  — 
  Length 
  3^ 
  inches 
  ; 
  width 
  3^ 
  inches; 
  height 
  l^ 
  -inch. 
  

  

  Description 
  — 
  This 
  is 
  a 
  rare 
  Urchin 
  at 
  Malta, 
  and 
  is 
  found 
  only 
  in 
  

   the 
  lower 
  bed 
  No. 
  5, 
  associated 
  with 
  Scutella 
  subrotunda. 
  The 
  test 
  

   is 
  oblong, 
  rather 
  wider 
  behind, 
  and 
  slightly 
  produced 
  anteriorly 
  and 
  

   posteriorly. 
  The 
  petaloid 
  ambulacra 
  are 
  nearly 
  uniform 
  in 
  width, 
  

   and 
  extend 
  over 
  more 
  than 
  one-half 
  of 
  the 
  upper 
  surface 
  ; 
  the 
  

   poriferous 
  zones 
  are 
  narrow 
  and 
  unequal 
  in 
  length 
  in 
  the 
  same 
  

   ambulacra 
  ; 
  the 
  pairs 
  of 
  pores 
  are 
  oblique 
  ; 
  the 
  outer 
  series 
  are 
  

   round, 
  slit 
  like 
  the 
  inner, 
  and 
  the 
  connecting 
  sulci 
  are 
  very 
  distinct. 
  

   The 
  apical 
  disk 
  is 
  small 
  and 
  a 
  little 
  excentral 
  ; 
  the 
  genital 
  plates 
  

   are 
  small, 
  and 
  concealed 
  by 
  the 
  spongy 
  madreporiform 
  body 
  which 
  

   covers 
  them 
  ; 
  the 
  sides 
  are 
  tumid, 
  the 
  margin 
  is 
  much 
  rounded, 
  and 
  

   the 
  outer 
  side 
  of 
  the 
  base 
  convex, 
  becoming 
  concave 
  towards 
  the 
  

   mouth. 
  The 
  vent 
  is 
  wide, 
  transversely 
  oblong, 
  and 
  closely 
  infra- 
  

  

  