﻿Gatty 
  Marine 
  Lahoratory^ 
  St. 
  Ati'Jrews. 
  95 
  

  

  hooks 
  is 
  intimately 
  associated 
  with 
  its 
  dorsal 
  edge. 
  No 
  

   other 
  hook 
  or 
  hristle 
  is 
  connected 
  with 
  it. 
  

  

  The 
  dense 
  rows 
  of 
  hooks 
  are 
  situated 
  on 
  the 
  edge 
  of 
  the 
  

   prominent 
  laraellse. 
  Each 
  has 
  a 
  short 
  base 
  or 
  shaft 
  and 
  a 
  

   well-marked 
  rounded 
  crown, 
  with 
  a 
  smaller 
  and 
  a 
  larger 
  

   facing 
  beneath, 
  the 
  curve 
  below 
  the 
  latter 
  sloping 
  to 
  a 
  

   modified 
  tooth 
  with 
  a 
  spinous 
  edge, 
  then 
  a 
  gulf 
  below 
  and 
  

   a 
  rounded 
  prow, 
  the 
  basal 
  line 
  being 
  slightly 
  sinuous. 
  

  

  The 
  caudal 
  appendix 
  (scapha) 
  presents 
  dorsally 
  an 
  almost 
  

   evenly 
  truncated 
  edge 
  in 
  a 
  line 
  with 
  the 
  general 
  surface, 
  the 
  

   margin, 
  however, 
  being 
  minutely 
  crenulate 
  and 
  projecting 
  a 
  

   little 
  beyond 
  the 
  dorsal 
  surface 
  of 
  the 
  appendix. 
  Then 
  

   follows 
  the 
  line 
  of 
  caudal 
  hooks 
  w^hich 
  abut 
  at 
  their 
  ventral 
  

   edge 
  on 
  the 
  rounded 
  and 
  flattened 
  lamella 
  w\th 
  the 
  cirrus. 
  

   A 
  notch 
  separates 
  the 
  ventral 
  edge 
  of 
  the 
  lamella 
  from 
  a 
  

   series 
  of 
  four 
  fimbriae 
  between 
  it 
  and 
  the 
  vent, 
  the 
  lower 
  

   edge 
  of 
  which 
  is 
  crenate 
  with 
  a 
  subulate 
  median 
  cirrus. 
  

   Nilsson 
  * 
  has 
  recently 
  shown 
  the 
  structure 
  of 
  the 
  eyes 
  of 
  

   this 
  organ. 
  

  

  The 
  caudal 
  hooks 
  are 
  slightly 
  narrowed 
  at 
  the 
  base 
  of 
  the 
  

   striated 
  shaft, 
  then 
  dilate, 
  continue 
  for 
  some 
  distance 
  with 
  

   nearly 
  parallel 
  sides, 
  diminish 
  toward 
  the 
  neck, 
  and 
  end 
  in 
  

   a 
  slight 
  curvature 
  at 
  the 
  point, 
  which 
  is 
  somewhat 
  blunt, 
  

   probably 
  from 
  friction. 
  

  

  The 
  tube 
  is 
  slightly 
  curved, 
  and 
  in 
  Malmgren's 
  examples 
  

   was 
  composed 
  of 
  minute 
  shells, 
  viz. 
  Bissoa 
  striata 
  and 
  Bulla 
  

   truncata. 
  Tubes 
  from 
  the 
  coast 
  of 
  Kerry 
  are 
  composed 
  of 
  

   comparatively 
  large 
  fragments 
  of 
  shells 
  and 
  stones 
  and 
  a 
  

   minute 
  Rissoa. 
  Those 
  from 
  432 
  fathoms 
  off 
  Ireland 
  in 
  the 
  

   ' 
  Porcupine'' 
  Expedition 
  of 
  1869 
  were 
  formed 
  of 
  proportion- 
  

   ally 
  large 
  translucent 
  grains 
  of 
  quartz 
  with 
  here 
  and 
  there 
  

   a 
  yellow 
  and 
  black 
  grain 
  of 
  other 
  material. 
  One 
  fragment 
  

   is 
  composed 
  of 
  Foraminifera 
  with 
  a 
  few 
  grains 
  of 
  sand, 
  but 
  

   its 
  identity 
  is 
  uncertain. 
  A 
  tube 
  from 
  567 
  fathoms 
  in 
  the 
  

   Atlantic, 
  in 
  the 
  ' 
  Porcupine'' 
  Expedition 
  of 
  1870, 
  presents 
  

   a 
  uniform 
  series 
  of 
  dull 
  yellow 
  grains 
  throughout. 
  The 
  

   rounded 
  and 
  comparatively 
  large 
  yellow 
  stones 
  forming 
  a 
  

   tube 
  from 
  a 
  depth 
  of 
  52^ 
  fathoms 
  (log 
  33) 
  off 
  the 
  south- 
  

   west 
  of 
  Ireland 
  are 
  noteworthy. 
  

  

  Mr.Crawshay 
  thinks 
  Gemmill's 
  record 
  is 
  the 
  first 
  in 
  Britain, 
  

   but 
  such 
  is 
  not 
  the 
  case. 
  

  

  * 
  Beitriige 
  Xerveiisyst. 
  Polvcli. 
  Zool. 
  Bidiag 
  Uppsala, 
  Bd, 
  i. 
  p. 
  137 
  

   (1912). 
  

  

  