﻿Gatly 
  Marine 
  Laboratory, 
  St. 
  Andrews. 
  107 
  

  

  and 
  there 
  is 
  less 
  regularity. 
  Tlie 
  edge 
  of 
  the 
  collar 
  thus 
  

   ditit'ei's 
  under 
  a 
  lens, 
  and 
  the 
  collar 
  is 
  often 
  shorter 
  from 
  side 
  

   to 
  side. 
  In 
  front 
  of 
  the 
  denticulated 
  collar 
  a 
  distinct 
  

   conical 
  process 
  passes 
  forward 
  to 
  the 
  space 
  between 
  the 
  

   branchiae. 
  On 
  the 
  ventral 
  surface, 
  again, 
  the 
  body-collar 
  

   has 
  not 
  the 
  prominent 
  lateral 
  edges 
  seen 
  in 
  M. 
  cristata. 
  

  

  Tlie 
  post-branchial 
  hooks 
  are 
  diagnostic, 
  and 
  their 
  position 
  

   is 
  the 
  same 
  as 
  in 
  M. 
  cristata. 
  They 
  have 
  a 
  broad, 
  almost 
  

   ovoid, 
  flattened 
  shaft, 
  the 
  base 
  of 
  which 
  is 
  often 
  oblique. 
  

   Anteriorly 
  it 
  somewhat 
  abruptly 
  narrows, 
  and 
  is 
  boldly 
  

   curved 
  forward 
  as 
  a 
  rounded, 
  tapering, 
  apparently 
  solid 
  hook 
  

   with 
  a 
  sharp 
  point. 
  The 
  broad 
  shaft 
  is 
  marked 
  by 
  fiue 
  

   longitudinal 
  lines, 
  wliicli 
  are 
  continued 
  beyond 
  the 
  curve 
  and 
  

   toward 
  the 
  tip 
  of 
  the 
  hook, 
  and 
  also 
  marked 
  by 
  slightly 
  

   curved 
  cross-strise 
  which 
  pass 
  forward 
  to 
  the 
  curve 
  or 
  neck 
  

   of 
  the 
  hook 
  and 
  then 
  cease, 
  the 
  tip 
  being 
  homogeneous 
  and 
  

   clear. 
  It 
  is 
  moved 
  by 
  powerful 
  muscles 
  attached 
  to 
  the 
  

   shaft. 
  The 
  concavity 
  of 
  the 
  hook 
  has 
  a 
  thick 
  layer 
  of 
  chitin, 
  

   but 
  no 
  canal 
  could 
  be 
  made 
  out. 
  Such 
  a 
  hook 
  differs 
  from 
  

   that 
  of 
  Melinna 
  cristata 
  in 
  outline 
  and 
  structure, 
  as 
  well 
  as 
  

   in 
  the 
  absence 
  of 
  the 
  canal 
  at 
  the 
  tip. 
  

  

  The 
  bristles 
  have 
  the 
  same 
  structure 
  as 
  in 
  M. 
  cristata, 
  viz. 
  

   translucent, 
  striated 
  shafts, 
  and 
  winged 
  tapering 
  tips, 
  and 
  

   they 
  are 
  accompanied 
  by 
  the 
  shorter 
  series 
  as 
  in 
  the 
  previous 
  

   form. 
  The 
  hooks 
  resemble 
  those 
  of 
  the 
  other 
  species, 
  but, 
  

   whilst 
  in 
  M. 
  cristata 
  they 
  often 
  show 
  five 
  teeth, 
  in 
  M. 
  elisa- 
  

   hethoi 
  four 
  is 
  the 
  usual 
  number, 
  and 
  the 
  curves 
  slightly 
  

   difl'er. 
  

  

  The 
  tube 
  of 
  this 
  form 
  consists 
  of 
  tough 
  secretion 
  coated 
  

   with 
  a 
  little 
  mud, 
  and 
  having 
  fragments 
  of 
  shell 
  attached 
  

   here 
  and 
  there 
  by 
  the 
  edges. 
  The 
  gastric 
  juice 
  of 
  the 
  fishes 
  

   does 
  not 
  seem 
  to 
  affect 
  the 
  tubes 
  much, 
  though 
  their 
  in- 
  

   habitants 
  are 
  rapidly 
  softened. 
  The 
  tubes 
  of 
  the 
  Norwegian 
  

   examples 
  are 
  of 
  tough 
  secretion 
  coated 
  with 
  fine 
  mud, 
  with 
  

   here 
  and 
  there 
  an 
  arenaceous 
  Foraminifer. 
  

  

  It 
  is 
  curious 
  that 
  this 
  species 
  has 
  never 
  been 
  tossed 
  on 
  

   shore 
  at 
  St. 
  Andrews. 
  It 
  probably 
  inhabits 
  the 
  deeper 
  

   water, 
  and 
  is 
  the 
  common 
  form 
  in 
  Norway. 
  

  

  Grube 
  describes 
  Melinna 
  palmata 
  from 
  St. 
  Malo, 
  where 
  he 
  

   obtained 
  a 
  single 
  specimen, 
  as 
  having 
  a 
  smooth 
  (entire) 
  

   margin 
  to 
  the 
  dorsal 
  collar 
  on 
  the 
  fourth 
  bristled 
  segment, 
  

   instead 
  of 
  the 
  fimbriated 
  margin 
  of 
  M. 
  cristata 
  and 
  M. 
  elisa- 
  

   bcthce. 
  There 
  are 
  eight 
  branchiaj, 
  which 
  difl^er 
  at 
  their 
  base 
  

   from 
  those 
  of 
  M. 
  cristata, 
  and 
  in 
  the 
  spirit-preparation 
  the 
  

   anterior 
  and 
  the 
  inner 
  filaments 
  of 
  the 
  posterior 
  branchia 
  

   are 
  longer 
  and 
  more 
  pointed 
  than 
  the 
  rest. 
  The 
  frontal 
  

  

  