﻿smith: 
  pelecypoda 
  from 
  the 
  Philippines. 
  15 
  

  

  as 
  Venus 
  tiara, 
  Dillwyn, 
  and 
  by 
  Sowerby 
  (Thes. 
  Conch,, 
  vol. 
  ii, 
  

   1853, 
  pi. 
  clviii, 
  fi<i;s. 
  125, 
  126) 
  also 
  as 
  tiara. 
  

  

  This 
  variety 
  differs 
  from 
  the 
  typical 
  form 
  of 
  the 
  species, 
  as 
  figured 
  

   by 
  Philippi, 
  in 
  having 
  the 
  concentric 
  laminae 
  more 
  prominently 
  

   foliated 
  posteriorly, 
  a 
  groove 
  down 
  the 
  dorsal 
  slope, 
  a 
  little 
  distance 
  

   from 
  the 
  margin, 
  cutting 
  through 
  the 
  lamellae 
  and 
  thus 
  forming 
  an 
  

   upper 
  or 
  marginal 
  series 
  of 
  short 
  lamellae. 
  

  

  Glycimeris 
  pectunculus 
  (Linn.), 
  var. 
  

  

  The 
  single 
  specimen 
  in 
  the 
  present 
  collection 
  is 
  flatter 
  than 
  usual, 
  

   and 
  the 
  costae 
  are 
  more 
  slender 
  than 
  in 
  normal 
  examples, 
  and 
  

   consequently 
  the 
  intervening 
  grooves 
  are 
  broader. 
  Another 
  slight 
  

   distinction 
  is 
  the 
  absence 
  of 
  brown 
  colour 
  on 
  the 
  hinge-plate, 
  

   a 
  conspicuous 
  feature 
  in 
  G. 
  pectunculus 
  and 
  G. 
  miishatensis, 
  Melvill. 
  

   The 
  latter 
  attains 
  much 
  larger 
  dimensions 
  than 
  those 
  given 
  by 
  the 
  

   author 
  of 
  his 
  type. 
  Specimens 
  in 
  the 
  Eritish 
  Museum 
  from 
  Muscat, 
  

   presented 
  by 
  Dr. 
  Jayakar, 
  are 
  41 
  mm. 
  high, 
  43 
  long, 
  and 
  27 
  in 
  

   diameter, 
  in 
  fact 
  almost 
  double 
  the 
  size 
  of 
  Mr. 
  Melvill's 
  shell. 
  

  

  Glycimeris 
  reevei 
  (Mayer), 
  Vieitelj. 
  Naturf. 
  Ges. 
  Zurich, 
  vol. 
  xiii, 
  

  

  1868, 
  p. 
  23, 
  as 
  Fectunculus. 
  

   = 
  Pectimciilus 
  angidatus, 
  lleeve 
  [non 
  Lamarck), 
  Conch. 
  Icon., 
  vol. 
  i, 
  

   fig. 
  30. 
  

   A 
  number 
  of 
  young 
  shells 
  16-19 
  mm. 
  in 
  length 
  appear 
  to 
  be 
  

   immature 
  examples 
  of 
  ttiis 
  species. 
  At 
  this 
  stage 
  of 
  growth 
  the 
  

   sculpture 
  is 
  more 
  raised, 
  the 
  radiating 
  threads 
  and 
  concentric 
  striae 
  

   which 
  cross 
  them 
  producing 
  a 
  granose 
  surface. 
  The 
  radiating 
  threads 
  

   are 
  in 
  groups 
  of 
  about 
  tour 
  or 
  five 
  on 
  the 
  middle 
  of 
  the 
  valves, 
  the 
  

   groups 
  being 
  marked 
  ofp 
  by 
  pale 
  striae. 
  At 
  the 
  sides 
  they 
  are 
  not 
  in 
  

   groups, 
  and 
  between 
  them 
  the 
  grooves 
  exhibit 
  very 
  short 
  bristles. 
  

   The 
  colour 
  is 
  variable, 
  usually 
  light 
  or 
  dark 
  brown 
  with 
  irregular 
  

   white 
  blotchings. 
  

  

  Glycimeris 
  planatus 
  (G. 
  & 
  H. 
  Nevill), 
  Journ. 
  Asiat. 
  Soc. 
  Bengal, 
  

   vol. 
  xliii, 
  pt. 
  ii, 
  1874, 
  p. 
  29, 
  pi. 
  i, 
  figs. 
  16, 
  16«, 
  as 
  Pectunculus. 
  

   This 
  Pecten-like 
  species 
  has 
  hitherto 
  been 
  known 
  only 
  from 
  the 
  

   Andaman 
  Islands. 
  The 
  colour 
  was 
  described 
  as 
  " 
  white, 
  mottled, 
  

   and 
  variegated 
  with 
  brown." 
  The 
  specimens 
  from 
  the 
  Philippine 
  

   Islands 
  are 
  white 
  spotted 
  with 
  red, 
  the 
  spots 
  being 
  only 
  on 
  the 
  

   radiating 
  ribs, 
  and 
  disposed 
  in 
  irregular 
  concentric 
  rows. 
  The 
  interior 
  

   is 
  white 
  with 
  a 
  faint 
  purplish 
  stain 
  below 
  the 
  umbones 
  down 
  the 
  middle 
  

   of 
  the 
  valves. 
  One 
  or 
  two 
  of 
  the 
  costae 
  on 
  each 
  side 
  near 
  the 
  hinge- 
  

   line 
  are 
  slender, 
  simple, 
  and 
  not 
  grooved 
  down 
  the 
  middle 
  like 
  those 
  

   on 
  the 
  rest 
  of 
  the 
  shell. 
  The 
  largest 
  specimen 
  is 
  20*5 
  mm. 
  in 
  height, 
  

   21 
  long, 
  10-5 
  in 
  diameter. 
  A 
  specimen 
  from 
  the 
  Andaman 
  Islands 
  in 
  

   the 
  British 
  Museum 
  is 
  about 
  the 
  same 
  size. 
  

  

  C. 
  DESCRIPTIONS 
  OF 
  THE 
  NEW 
  SPECIES. 
  

  

  PSAMMOBIA 
  PHILIPPINENSIS, 
  U.Sp. 
  PL 
  I, 
  FigS. 
  16-18. 
  

  

  Shell 
  transversely 
  elongate, 
  slightly 
  inequilateral, 
  anterior 
  portion 
  

   rather 
  the 
  longer, 
  sharply 
  rounded 
  at 
  both 
  ends, 
  somewhat 
  more 
  

  

  