﻿mklvill: 
  pyeamidellid^ 
  of 
  the 
  peesian 
  gulf, 
  etc. 
  '20S 
  

  

  Sab. 
  — 
  P.G. 
  Bushire 
  ; 
  Mussandam. 
  

  

  I. 
  Bombay. 
  

  

  Allied 
  to, 
  if 
  indeed 
  it 
  be 
  not 
  an 
  extreme 
  variety 
  of, 
  F. 
  pyrgomella, 
  

   but 
  the 
  much 
  larger 
  number 
  of 
  lightly 
  impressed 
  longitudinal 
  ribs, 
  

   spirally 
  gemmulate 
  below 
  the 
  sutures, 
  the 
  smaller 
  size, 
  and 
  straighter 
  

   body-whorl 
  serve 
  to 
  distinguish 
  it. 
  Singly, 
  it 
  has 
  occurred 
  in 
  shell- 
  

   sand 
  at 
  Bombay, 
  whence 
  comes 
  the 
  type 
  figured, 
  and 
  at 
  two 
  places 
  in 
  

   the 
  Persian 
  Gulf. 
  

  

  Pyegitlina 
  teneeeima 
  (Melvill). 
  

   Odostomia 
  {Pyrgulina) 
  tenerrima, 
  Melvill, 
  Proc. 
  Malac. 
  Soc, 
  vol. 
  vii, 
  

   p. 
  74, 
  pi. 
  vii, 
  fig. 
  13. 
  

   Sah.—T.G. 
  Gulf 
  of 
  Oman, 
  lat. 
  24° 
  58' 
  N., 
  long. 
  56° 
  54' 
  E., 
  

   156 
  fathoms, 
  shell-sand. 
  

  

  Paucicostate, 
  with 
  gradate 
  whorls, 
  the 
  broad 
  intercostal 
  spaces 
  

   finely 
  striate. 
  It 
  occurred 
  very 
  rarely, 
  but 
  could 
  easily 
  be 
  overlooked, 
  

   as 
  it 
  is 
  one 
  of 
  the 
  minutest 
  species 
  known. 
  An 
  error 
  occurs 
  in 
  the 
  

   original 
  description, 
  the 
  interstices 
  being 
  given 
  as 
  smooth. 
  

  

  Ptegtjlina 
  thelxinoa 
  (Melvill). 
  

   Odostomia 
  [Pyrgulina) 
  thelxinoa, 
  Proc. 
  Malac. 
  Soc, 
  vol. 
  vii, 
  p. 
  75, 
  

   pi. 
  vii, 
  fig. 
  14. 
  

   Hub. 
  — 
  P.G. 
  Gulf 
  of 
  Oman, 
  with 
  P. 
  tenerrima, 
  at 
  156 
  fathoms. 
  

   This 
  minute 
  shell 
  is 
  near 
  P. 
  Syhesii, 
  Dautz. 
  & 
  Fischer, 
  but 
  with 
  

   more 
  frequent 
  ribs, 
  and 
  the 
  intercostal 
  spaces 
  not, 
  therefore, 
  so 
  broad. 
  

   The 
  form 
  is 
  precisely 
  similar, 
  and 
  measurements 
  likewise. 
  

  

  Pyegxjlina 
  zidoea, 
  n.sp. 
  PL 
  VI, 
  Pig. 
  12. 
  

  

  P. 
  testa 
  conico-fusiformi, 
  rimata, 
  solidula, 
  sordide 
  alba, 
  anfractibus 
  

   ad 
  7, 
  quorum 
  apicales 
  heterostrophi, 
  parvi, 
  cseteris 
  5 
  longitudinaliter 
  

   arete 
  recticostatis, 
  ad 
  suturas 
  multum 
  impressis, 
  interstitiis 
  Isevibus, 
  

   ultimo 
  usque 
  ad 
  basim 
  ipsam 
  seque 
  et 
  regulariter 
  costulato, 
  apertura 
  

   ovata, 
  labro 
  paullum 
  effuso, 
  margine 
  columellari 
  incrassato, 
  fortissimo 
  

   uniplicato. 
  Long. 
  4-50, 
  lat. 
  2 
  mm. 
  

  

  Hal. 
  — 
  P.G. 
  Mussandam, 
  50 
  fathoms, 
  April, 
  1910. 
  

  

  An 
  interesting 
  species, 
  with 
  some 
  leaning 
  towards 
  the 
  typical 
  section 
  

   of 
  the 
  order, 
  and 
  we 
  only 
  describe 
  it 
  tentatively 
  as 
  a 
  Pyrgulina, 
  since 
  

   at 
  present 
  it 
  appears 
  to 
  come 
  nearest 
  to 
  our 
  P. 
  epentromidea, 
  the 
  chief 
  

   points 
  of 
  difference 
  being 
  in 
  the 
  much 
  closer 
  and 
  more 
  incrassate 
  

   character 
  of 
  the 
  ribs, 
  and 
  especially 
  their 
  continuance 
  over 
  the 
  whole 
  

   of 
  the 
  body- 
  whorl, 
  not 
  being 
  evanescent 
  below 
  the 
  periphery, 
  as 
  in 
  

   the 
  case 
  with 
  the 
  lighter 
  and 
  more 
  superficial 
  costce 
  of 
  the 
  older 
  species. 
  

   The 
  columellar 
  plait 
  is 
  in 
  both 
  species 
  very 
  strongly 
  pronounced. 
  

  

  Odostomia 
  anabathmis,^ 
  n.sp. 
  PI. 
  VI, 
  Fig. 
  13. 
  

   0. 
  testa 
  perparva, 
  albo-lactea, 
  ovato 
  oblonga, 
  laevigata, 
  nitida, 
  

   anfractibus 
  6, 
  quorum 
  duo 
  apicales 
  heterostrophi, 
  cseteris 
  gradatis, 
  

  

  ' 
  avdfiaOfiis, 
  a 
  stair, 
  from 
  the 
  gradate 
  whorls. 
  

  

  