﻿G'atty 
  Marine 
  Laboratory 
  , 
  St. 
  Andrews. 
  119 
  

  

  2. 
  On 
  Nevaya* 
  wkiteavesi, 
  a 
  Form 
  with 
  certain 
  Relationships 
  

   to 
  Sclerocheilus, 
  Grub 
  e, 
  from 
  Canada. 
  

  

  Dredged 
  at 
  Station 
  52, 
  Gulf 
  of 
  St. 
  Lawrence, 
  Canada, 
  

   1873, 
  by 
  Dr. 
  Whiteaves. 
  

  

  A 
  fragment 
  of 
  the 
  anterior 
  region 
  of 
  a 
  form 
  (PI. 
  V. 
  fig. 
  1) 
  

   with 
  a 
  somewhat 
  broad 
  flattened 
  body, 
  a 
  little 
  tapered 
  toward 
  

   the 
  front 
  and 
  rapidly 
  narrowing 
  behind 
  the 
  broad 
  anterior 
  

   region. 
  The 
  feet 
  are 
  deeply 
  cut 
  and 
  have 
  conspicuous 
  

   bristles. 
  Moreover, 
  the 
  second 
  bristled 
  segment 
  has 
  specially 
  

   modified 
  powerful 
  golden 
  bristles. 
  

  

  The 
  head 
  has 
  anteriorly 
  a 
  somewhat 
  slender 
  prow 
  (PI. 
  V. 
  

   fig. 
  1 
  a), 
  slightly 
  blunt 
  at 
  the 
  tip. 
  From 
  this 
  a 
  prominent 
  

   and 
  rather 
  narrow 
  median 
  ridge 
  (flattened 
  vertically) 
  passes, 
  

   backward 
  to 
  terminate 
  in 
  a 
  small 
  tentacle 
  at 
  the 
  second 
  

   bristled 
  segment. 
  The 
  central 
  region 
  of 
  the 
  snout, 
  indeed, 
  

   is 
  somewhat 
  spindle-shaped 
  when 
  viewed 
  from 
  the 
  dorsum, 
  

   as 
  a 
  dilatation 
  occurs 
  in 
  the 
  middle, 
  folloAvedby 
  the 
  vertically 
  

   flattened 
  posterior 
  portion. 
  This 
  condition 
  recalls 
  that 
  in 
  

   Nerine, 
  especially 
  as 
  the 
  lanceolate 
  lateral 
  processes 
  resemble 
  

   the 
  branchiae 
  of 
  that 
  form. 
  Part 
  of 
  the 
  proboscis 
  is 
  extruded 
  

   as 
  a 
  frilled 
  organ. 
  On 
  each 
  side 
  of 
  the 
  median 
  ridge 
  ante- 
  

   riorly 
  is 
  an 
  acutely 
  lanceolate 
  lamella 
  (which 
  may 
  be 
  bran- 
  

   chial 
  in 
  function) 
  pointing 
  backward 
  and 
  outward, 
  whilst 
  

   from 
  its 
  inner 
  border 
  a 
  tuft 
  of 
  slender 
  glistening 
  bristles 
  

   (PI. 
  V. 
  fig. 
  1 
  d) 
  is 
  directed 
  upward, 
  thus 
  forming 
  a 
  remark- 
  

   able 
  arrangement 
  in 
  this 
  region, 
  and 
  probably 
  representing 
  

   the 
  dorsal 
  division 
  of 
  the 
  first 
  pair 
  of 
  feet. 
  Below 
  is 
  a 
  small 
  

   conical 
  lamella, 
  followed 
  ventrally 
  by 
  a 
  second 
  of 
  similar 
  

   shape, 
  a 
  tuft 
  of 
  bristles 
  projecting 
  downward, 
  outward, 
  and 
  

   forward 
  in 
  front 
  and 
  glistening 
  with 
  a 
  brilliant 
  metallic 
  

   sheen. 
  The 
  ventral 
  edge 
  of 
  this 
  foot 
  forms 
  a 
  long 
  rounded 
  

   elevation 
  directed 
  obliquely 
  outward 
  and 
  forward 
  from 
  the 
  

   median 
  line 
  and 
  apparently 
  clasping 
  the 
  buccal 
  region. 
  The 
  

   ventral 
  division 
  carries 
  a 
  series 
  of 
  rather 
  stout 
  curved 
  bristles 
  

   (PL 
  V. 
  fig. 
  1 
  b), 
  with 
  a 
  hook 
  at 
  the 
  tip 
  directed 
  backward, 
  

   but 
  considerable 
  differences 
  exist 
  amongst 
  them, 
  some 
  being- 
  

   longer 
  and 
  more 
  slender. 
  At 
  the 
  posterior 
  part 
  of 
  the 
  

   cephalic 
  median 
  ridge 
  another 
  narrow 
  lanceolate 
  lamella 
  

   projects 
  on 
  each 
  side, 
  the 
  base 
  being 
  somewhat 
  broader 
  than 
  

   that 
  in 
  front. 
  In 
  the 
  preparation 
  it 
  slopes 
  obliquely 
  back- 
  

   ward 
  and 
  outward. 
  The 
  arrangement 
  of 
  these 
  lamellae 
  

   therefore 
  recalls 
  the 
  condition 
  in 
  Spiophanes. 
  Their 
  relation- 
  

   ship 
  to 
  the 
  feet 
  may 
  not 
  be 
  quite 
  free 
  from 
  doubt. 
  The 
  next 
  

  

  * 
  Named 
  after 
  Nevay 
  Park, 
  on 
  the 
  Sidlaws, 
  Forfarshire. 
  

  

  