﻿MELVILL 
  : 
  PrKAMIDELLID^ 
  OF 
  THE 
  PERSIAN 
  GULF, 
  ETC. 
  185 
  

  

  TUKBONILLA 
  GALACTODES/ 
  n.Sp. 
  PI. 
  IV, 
  Fig. 
  14. 
  

  

  T. 
  testa 
  attemiato-couica, 
  gracili, 
  parva, 
  alba, 
  anfractibus 
  9-10, 
  

   quorum 
  apicales 
  heterostropbi, 
  planorbuli, 
  laeves, 
  cteteris 
  ad 
  suturas 
  

   impressis, 
  ventricosis, 
  rotundatis, 
  arctissime 
  costatis, 
  costis 
  incrassatis, 
  

   laevissimis, 
  nitidis, 
  ultimum 
  apud 
  anfractum 
  infra 
  peripberiam 
  ad 
  

   basim 
  evanidis, 
  interstitiis 
  omnibus 
  laevibus, 
  numero 
  costarum 
  

   ultimi 
  anfractus 
  circa 
  28, 
  apertura 
  magna, 
  ovata, 
  peristomate 
  fere 
  

   continue, 
  columella 
  simplice. 
  Long. 
  3'50, 
  lat. 
  1 
  mm. 
  

  

  Rab.—'P.G. 
  Gulf 
  of 
  Oman, 
  lat. 
  24° 
  58' 
  N., 
  long. 
  56° 
  54' 
  E., 
  

   150 
  fatboms. 
  

  

  A 
  species 
  not 
  very 
  easy 
  to 
  define 
  as 
  regards 
  its 
  precise 
  limitations. 
  

   For 
  tbe 
  type 
  we 
  take 
  a 
  sbell 
  with 
  rounded 
  whorls, 
  ornamented 
  with 
  

   thickened 
  close 
  longitudinal 
  ribs, 
  these 
  ribs 
  fairly 
  straight, 
  the 
  inter- 
  

   stices 
  being 
  smooth. 
  Some 
  specimens 
  dr-edged 
  in 
  live 
  but 
  not 
  mature 
  

   condition 
  are 
  nearly 
  allied 
  to 
  this, 
  and 
  these 
  were 
  provisionally 
  

   identified 
  as 
  T. 
  tenuicosta, 
  Issel, 
  an 
  Erythraean 
  species, 
  but 
  are 
  

   distinct. 
  They 
  came 
  from 
  lat. 
  25° 
  24' 
  N., 
  long. 
  57° 
  27' 
  E., 
  

   243 
  fathoms, 
  sand 
  and 
  mud, 
  and 
  we 
  expect, 
  though 
  the 
  ribs 
  are 
  

   slightly 
  more 
  flexuose, 
  that 
  they 
  are 
  identical 
  with 
  T. 
  galactodes. 
  

  

  TuEBONiLLA 
  Hekmia, 
  Melvill. 
  

  

  Turhonilla 
  Hermia, 
  Melvill, 
  Proc. 
  Malac. 
  Soc, 
  vol. 
  vii, 
  p. 
  74, 
  pi. 
  vii, 
  

   fig. 
  11. 
  

  

  iZr/5.— 
  P.G. 
  Gulf 
  of 
  Oman, 
  lat. 
  24° 
  58' 
  K, 
  long. 
  56° 
  54' 
  E., 
  

   156 
  fathoms. 
  

  

  Allied 
  to 
  T. 
  Ahercromhiei, 
  T. 
  Mickaelis, 
  and 
  T. 
  galactodes, 
  the 
  last 
  

   two 
  being 
  described 
  in 
  this 
  paper, 
  this 
  species 
  will 
  be 
  known 
  from 
  all 
  

   by 
  its 
  compact 
  substance 
  and 
  form, 
  the 
  very 
  fine 
  interstitial 
  striations 
  

   being 
  another 
  distinguishing 
  characteristic, 
  though 
  this 
  feature 
  is 
  

   almost, 
  if 
  not 
  quite, 
  obsolete 
  in 
  some 
  specimens. 
  It 
  is 
  locally 
  an 
  

   extremely 
  abundant 
  species, 
  very 
  closely 
  and 
  somewhat 
  flexuously 
  

   ribbed, 
  ten 
  or 
  eleven 
  whorled, 
  the 
  nuclear 
  whorls 
  planorbiform, 
  and 
  

   when 
  once 
  distinguished 
  is 
  easy 
  to 
  recognize. 
  

  

  TuEBowiLLA 
  icELA,^ 
  n.sp. 
  PI. 
  IV, 
  Fig. 
  15. 
  

  

  T. 
  testa 
  parva, 
  aciculata, 
  pergracili, 
  delicata, 
  tenui, 
  pellucente, 
  

   albo-lactea, 
  anfractibus 
  10-11, 
  quorum 
  apicales 
  pupseformes, 
  inversim 
  

   heterostropbi, 
  conspicui, 
  cseteris 
  ad 
  suturas 
  niultum 
  impressis, 
  

   ventricosis, 
  longitudinaliter 
  obliquicostatis, 
  costarum 
  numero 
  anfractus 
  

   ultimi 
  ad 
  21, 
  infra 
  peripberiam 
  ad 
  basim 
  evanidis, 
  apertura 
  ovata, 
  

   peristomate 
  fere 
  continue, 
  columella 
  simplice. 
  Long. 
  5*50, 
  lat. 
  l*20mm. 
  

  

  Ilab.—Y.G. 
  Gulf 
  of 
  Oman, 
  lat. 
  24° 
  58' 
  N., 
  long. 
  56° 
  54' 
  E., 
  

   156 
  fathoms, 
  sh 
  ell- 
  sand 
  ; 
  Bushire. 
  

  

  M.C. 
  Charbar, 
  40 
  fathoms. 
  

  

  Avery 
  abundant 
  species 
  in 
  the 
  first 
  and 
  last 
  of 
  the 
  above-mentioned 
  

   localities, 
  and 
  confounded 
  with 
  T. 
  sororia, 
  Melv., 
  from 
  Bombay 
  till 
  

   very 
  recently. 
  Its 
  graceful 
  form, 
  milky- 
  white 
  colour, 
  and 
  very 
  

  

  ^ 
  7aAaKTci5rjs, 
  milky 
  white. 
  ' 
  eif/ceAos, 
  like, 
  similar. 
  

  

  