﻿108 
  Prof. 
  M'Tntosh's 
  No 
  I 
  es 
  from 
  the 
  

  

  shaft 
  is 
  finely 
  striated 
  longitudinally, 
  the 
  striae 
  converging 
  

   as 
  the 
  hook 
  narrows 
  distally 
  and 
  ceasing 
  within 
  the 
  tip. 
  

  

  The 
  ordinary 
  hooks 
  are 
  arranged 
  on 
  small 
  ridges 
  beneath 
  

   the 
  bristle-tnt'ts 
  anteriorly 
  from 
  the 
  fourth 
  segment 
  back- 
  

   ward. 
  The 
  lamellse 
  which 
  carry 
  the 
  hooks 
  are 
  at 
  first 
  small, 
  

   but 
  by 
  and 
  by 
  they 
  project 
  as 
  small 
  flaps 
  with 
  a 
  tendency 
  to 
  

   a 
  prolongation 
  ventrally. 
  The 
  hooks 
  present 
  a 
  rounded 
  

   crown 
  with 
  four 
  teeth 
  on 
  the 
  front 
  edge, 
  increasing 
  in 
  size 
  

   from 
  the 
  first 
  to 
  the 
  third, 
  the 
  fourth 
  having 
  a 
  broad 
  base, 
  

   but 
  a 
  shorter 
  fang, 
  since 
  tlie 
  gulf 
  above 
  the 
  rounded 
  prow 
  is 
  

   small. 
  The 
  posterior 
  margin 
  is 
  sinuous 
  and 
  the 
  base 
  rounded. 
  

   Behind 
  the 
  bristled 
  region 
  the 
  lamellse 
  become 
  more 
  pro- 
  

   minent, 
  and 
  have 
  a 
  small 
  papilla 
  dorsally. 
  

  

  The 
  tube 
  is 
  coated 
  with 
  greyish 
  mud 
  and 
  lined 
  with 
  tougli 
  

   secretion. 
  Attached 
  externally 
  in 
  Norwegian 
  examples 
  are 
  

   fragments 
  of 
  shells, 
  it 
  may 
  be 
  in 
  considerable 
  number, 
  and 
  

   occasionally 
  globular 
  arenaceous 
  Foraminifera 
  with 
  grains 
  of 
  

   sand 
  in 
  mud, 
  and 
  here 
  and 
  there 
  the 
  leaf 
  of 
  an 
  alga. 
  

  

  The 
  seventh 
  species 
  is 
  Melinna 
  eUsabethce, 
  M'Intosh. 
  

   The 
  specimens 
  of 
  this 
  species 
  were 
  first 
  obtained 
  in 
  Britain 
  

   by 
  my 
  mother 
  in 
  the 
  stomachs 
  of 
  haddocks, 
  and 
  consequently 
  

   the 
  external 
  configuration 
  was 
  altered. 
  The 
  presence 
  of 
  the 
  

   same 
  form 
  in 
  Norwegian 
  waters 
  (dredged 
  by 
  Dr. 
  Merle 
  

   Norman) 
  enables 
  a 
  more 
  satisfactory 
  description 
  to 
  be 
  

   made. 
  

  

  The 
  head 
  and 
  anterior 
  region, 
  while 
  formed 
  on 
  the 
  general 
  

   plan 
  of 
  M. 
  cristata, 
  have 
  proportionally 
  longer 
  branchiae 
  

   and 
  tentacles. 
  The 
  cephalic 
  border 
  anteriorly 
  has 
  a 
  slight 
  

   notch 
  and 
  two 
  lateral 
  eminences, 
  and 
  the 
  tentacular 
  plate 
  

   and 
  the 
  tentacles 
  are 
  often 
  pushed 
  beyond 
  it. 
  The 
  tentacles 
  

   are 
  remarkably 
  long, 
  and 
  the 
  mouth 
  forms 
  a 
  gaping 
  aperture 
  

   beneath 
  them 
  at 
  the 
  end 
  of 
  the 
  bluntly 
  conical 
  region. 
  

  

  The 
  branchiae 
  arise 
  from 
  two 
  basal 
  processes, 
  where 
  they 
  

   are 
  fused, 
  and 
  they 
  are 
  longer 
  and 
  more 
  distinctly 
  tapered 
  

   than 
  in 
  M. 
  cristata. 
  Moreover, 
  they 
  do 
  not 
  lend 
  themselves 
  

   to 
  a 
  transverse 
  division 
  into 
  an 
  anterior 
  and 
  a 
  posterior 
  pair 
  

   as 
  in 
  M. 
  cristata. 
  The 
  outer 
  and 
  more 
  slender 
  branchia 
  

   separates 
  readily 
  to 
  the 
  base, 
  and 
  the 
  next 
  to 
  it 
  posteriorly 
  

   nearly 
  as 
  far, 
  but 
  the 
  two 
  inner 
  (the 
  one 
  in 
  front 
  of 
  the 
  

   other) 
  are 
  united 
  for 
  a 
  considerable 
  distance 
  above 
  the 
  base. 
  

   Their 
  arrangement, 
  therefore, 
  differs 
  from 
  that 
  in 
  M. 
  cristata. 
  

   The 
  dorsal 
  collar 
  stretches 
  in 
  the 
  same 
  manner 
  as 
  in 
  the 
  

   latter, 
  but 
  the 
  free 
  edges 
  of 
  the 
  two 
  differ, 
  for, 
  instead 
  of 
  

   the 
  very 
  large, 
  regular, 
  conical 
  processes 
  of 
  M. 
  cristata, 
  this 
  

   form 
  has 
  smaller 
  conical 
  processes, 
  often 
  in 
  groups 
  of 
  three, 
  

  

  