﻿474 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  is 
  also 
  a 
  new 
  species 
  of 
  Thecidium, 
  a 
  Lenticulites, 
  a 
  small 
  Terebra- 
  

   tula, 
  and 
  one 
  or 
  more 
  Oidarites 
  which 
  I 
  have 
  not 
  observed 
  elsewhere. 
  

   I 
  have 
  found 
  a 
  few 
  teeth 
  of 
  the 
  great 
  Shark, 
  Qarcharodon 
  mega- 
  

   lodon, 
  and 
  a 
  smaller 
  species, 
  besides 
  teeth 
  of 
  Pi/ 
  cnodonts, 
  and 
  the 
  pave- 
  

   ment-shaped 
  teeth 
  of 
  Ptychodonts, 
  also 
  Cetacean 
  bones 
  in 
  fragments. 
  

   In 
  a 
  large 
  quarry 
  in 
  this 
  rock 
  at 
  Has 
  il 
  Kala, 
  Gozo, 
  is 
  seen 
  a 
  regular 
  

   nodular 
  bed 
  traversing 
  the 
  face 
  of 
  a 
  cliff 
  of 
  sennciystalline 
  limestone. 
  

   The 
  nodules 
  are 
  exactly 
  similar 
  to 
  those 
  of 
  No. 
  4, 
  but 
  more 
  

   rounded 
  and 
  water-worn, 
  and 
  are 
  firmly 
  cemented 
  by 
  a 
  hard 
  light- 
  

   brown 
  cement 
  (in 
  fact 
  a 
  vein 
  of 
  conglomerate). 
  The 
  Fungia, 
  so 
  

   characteristic 
  of 
  the 
  beds 
  of 
  No. 
  4, 
  is 
  also 
  common 
  in 
  this 
  bed. 
  

   This 
  is 
  the 
  only 
  locality 
  in 
  which 
  I 
  have 
  observed 
  the 
  nodular 
  bed 
  

   in 
  No. 
  5 
  ; 
  it 
  is 
  situated 
  about 
  12 
  feet 
  below 
  the 
  level 
  of 
  the 
  bed. 
  

   Seutella 
  striatula 
  (if 
  distinct 
  from 
  S. 
  subrotunda) 
  must 
  be 
  very 
  

   rare 
  in 
  the 
  Maltese 
  beds, 
  as 
  I 
  have 
  not 
  met 
  with 
  one 
  specimen 
  of 
  a 
  

   full-grown 
  Urchin 
  to 
  agree 
  with 
  the 
  description 
  of 
  Marcel 
  de 
  Serres. 
  

  

  II. 
  Descriptions 
  of 
  the 
  Species 
  of 
  Echinoderms. 
  

   By 
  Thomas 
  Wright, 
  M.D., 
  F.R.S., 
  F.G.S. 
  

  

  1. 
  Cidaris 
  Melitensis, 
  Forbes. 
  

  

  Strattgraphical 
  position. 
  — 
  The 
  small 
  and 
  perfect 
  specimens 
  are 
  

   found 
  in 
  No. 
  1 
  bed 
  — 
  the 
  Upper 
  Limestone 
  ; 
  many 
  fragments 
  of 
  larger 
  

   individuals 
  of 
  the 
  same 
  species 
  are 
  found 
  in 
  bed 
  No. 
  5. 
  

  

  Collections. 
  — 
  Earl 
  of 
  Ducie; 
  Mus. 
  Royal 
  School 
  of 
  Mines; 
  Geol. 
  Soc. 
  

  

  2. 
  Cidaris 
  Scilla, 
  "Wright. 
  

  

  Echinus, 
  Scilla, 
  Corp. 
  Mar. 
  tab. 
  xxiii. 
  xxiv. 
  1747. 
  

  

  Form 
  of 
  the 
  test 
  unknown 
  ; 
  ambulacral 
  areas 
  sinuous, 
  narrow, 
  

   with 
  four 
  rows 
  of 
  small 
  granules 
  ; 
  poriferous 
  zones 
  narrow, 
  holes 
  

   small, 
  interambulacral 
  areas 
  wide, 
  plates 
  large 
  ; 
  areolas 
  wide, 
  flat, 
  

   and 
  superficial 
  ; 
  mammary 
  summit 
  smooth, 
  and 
  without 
  crenulations 
  ; 
  

   tubercle 
  large, 
  with 
  a 
  small 
  perforation 
  ; 
  median 
  intertubercular 
  

   space 
  wide, 
  filled 
  with 
  fine 
  small 
  tubercles. 
  

  

  This 
  Cidaris 
  appears 
  to 
  be 
  the 
  species 
  figured 
  by 
  Scilla. 
  Dr. 
  

   Adams 
  has 
  collected 
  only 
  a 
  fragment 
  of 
  the 
  test, 
  consisting 
  merely 
  of 
  

   portions 
  of 
  the 
  areas 
  and 
  zones, 
  and 
  the 
  median 
  intertubercular 
  

   space. 
  It 
  must 
  have 
  attained 
  a 
  large 
  size, 
  was 
  very 
  distinct 
  from 
  

   Cidaris 
  Melitensis, 
  and 
  equally 
  remote 
  from 
  Cidaris 
  Adamsii, 
  Wr. 
  

  

  Stratigraphical 
  position. 
  — 
  Found 
  in 
  bed 
  No. 
  4 
  at 
  Malta. 
  I 
  have 
  

   no 
  notes 
  of 
  the 
  distribution 
  of 
  this 
  species 
  beyond 
  the 
  figures 
  on 
  the 
  

   fragment. 
  

  

  3. 
  Cidaris 
  Adamsi, 
  Wright, 
  spec. 
  nov. 
  PI. 
  XXI. 
  fig. 
  5. 
  

  

  Test 
  large, 
  form 
  unknown 
  ; 
  ambulacra! 
  areas 
  narrow, 
  with 
  two 
  

   marginal 
  rows 
  of 
  small 
  tubercles 
  and 
  four 
  minor 
  rows 
  of 
  small 
  

   granules 
  ; 
  poriferous 
  zones 
  narrow 
  and 
  depressed 
  in 
  a 
  groove 
  ; 
  fifteen 
  

   pairs 
  of 
  holes 
  opposite 
  one 
  of 
  the 
  large 
  interambulacral 
  plates 
  ; 
  

   a 
  fine 
  ridge 
  divides 
  each 
  pair 
  of 
  holes 
  ; 
  interambulacral 
  areas 
  wide 
  ; 
  

   each 
  column 
  of 
  plates 
  forms 
  a 
  convex 
  prominence, 
  occasioned 
  by 
  the 
  

  

  