﻿No.nSQ. 
  DEEP-WATEE 
  MOLLUSCA—VERBILL 
  AND 
  BUSH. 
  799 
  

  

  CUSPIDARIA 
  LAMELLOSA 
  (M. 
  Sars) 
  Ball. 
  

   (Plate 
  LXXIV, 
  fig. 
  10.) 
  

  

  Newra 
  lamellosa 
  Verrill, 
  Trans. 
  Conn. 
  Acad., 
  Y, 
  p. 
  561, 
  1882; 
  VI, 
  p. 
  277, 
  pi. 
  xxx, 
  

   fig. 
  3, 
  1884; 
  Expl. 
  Albatross, 
  Report 
  U. 
  S. 
  Com. 
  Fish 
  and 
  Fisheries 
  lor 
  1883, 
  

   p. 
  574, 
  1885. 
  

  

  Ciispidaria 
  lamellosa 
  Dall, 
  Bull. 
  Mns. 
  Comp. 
  ZoiJl., 
  XII, 
  p. 
  294, 
  1886; 
  Bull. 
  U.S. 
  

   Nat. 
  Mus., 
  No. 
  37, 
  p. 
  66, 
  pi. 
  xlv, 
  fig. 
  3, 
  1889. 
  

  

  • 
  

  

  Comparatively 
  few 
  specimens, 
  at 
  twelve 
  stations, 
  between 
  N. 
  lat. 
  40^ 
  

   2' 
  49", 
  W. 
  long. 
  Q^^ 
  49', 
  and 
  N. 
  lat. 
  37° 
  59' 
  30", 
  W. 
  long. 
  73° 
  48' 
  40", 
  

   in 
  319 
  to 
  555 
  fathoms, 
  1880-1886. 
  

  

  A 
  few 
  specimens 
  occurred 
  which 
  differ 
  from 
  the 
  typical 
  form 
  in 
  hav- 
  

   ing 
  but 
  five 
  or 
  six 
  concentric 
  lamelhe 
  visible 
  on 
  the 
  antero-ventral 
  

   portion 
  of 
  each 
  valve 
  and 
  only 
  cousj)icuous 
  unequal 
  lines 
  of 
  growth 
  on 
  

   the 
  rest 
  of 
  the 
  surface. 
  

  

  CUSPIDARIA 
  TURGIDA, 
  new 
  species. 
  

   (Plates 
  LXXII, 
  fig. 
  7; 
  LXXVII, 
  fig. 
  4.) 
  

  

  Shell 
  rather 
  large, 
  thin, 
  delicate, 
  translucent, 
  of 
  a 
  pinkish 
  white 
  

   color 
  within, 
  long-oval, 
  with 
  prominent, 
  posteriorly 
  directed 
  umbos, 
  and 
  

   narrow, 
  rather 
  long 
  posterior 
  rostrum. 
  The 
  beaks 
  are 
  central, 
  rather 
  

   acute 
  and 
  turned 
  distinctly 
  forward. 
  The 
  antero-dorsal 
  margin 
  is 
  

   slightly 
  convex, 
  forming 
  a 
  broad 
  curve; 
  the 
  anterior 
  end 
  is 
  a 
  little 
  

   prolonged 
  in 
  the 
  middle 
  but 
  otherwise 
  pretty 
  evenly 
  rounded; 
  the 
  

   ventral 
  margin 
  forms 
  a 
  regular, 
  broad 
  curve 
  becoming 
  strongly 
  incurved 
  

   at 
  the 
  base 
  of 
  the 
  rostrum; 
  the 
  posterodorsal 
  margin 
  is 
  straight 
  at 
  

   first, 
  but 
  slightly 
  concave 
  along 
  the 
  rostrum. 
  The 
  cartilage-plate 
  is 
  

   small 
  and 
  very 
  oblique, 
  and 
  in 
  the 
  right 
  valve, 
  is 
  separated 
  by 
  a 
  dis- 
  

   tinct 
  notch 
  from 
  the 
  lateral 
  tooth, 
  which 
  is 
  long 
  and 
  low, 
  with 
  a 
  

   rounded 
  summit 
  and 
  a 
  long, 
  gradual, 
  posterior 
  slope; 
  there 
  is 
  no 
  trace 
  

   of 
  buttress 
  or 
  clavicle. 
  In 
  the 
  left 
  valve 
  the 
  hinge-margin 
  is 
  thin, 
  and 
  

   nearly 
  simple 
  both 
  anteriorly 
  and 
  posteriorly. 
  The 
  exterior 
  surfiice 
  is 
  

   covered 
  with 
  a 
  thin, 
  yellowish 
  gray 
  epidermis 
  and 
  is 
  marked 
  with 
  

   irregular, 
  rather 
  conspicuous 
  lines 
  of 
  growth 
  ; 
  on 
  the 
  rostrum 
  there 
  is 
  a 
  

   distinct 
  diagonal 
  ridge 
  running 
  from 
  the 
  beaks 
  to 
  the 
  lower 
  margin. 
  

  

  Length, 
  22 
  mm.; 
  height, 
  12 
  mm.; 
  breadth, 
  11 
  mm.; 
  distance 
  from 
  cen- 
  

   ter 
  of 
  beak 
  to 
  end 
  of 
  rostrum, 
  12 
  mm. 
  ; 
  to 
  extreme 
  anterior 
  end, 
  12 
  mm. 
  

  

  In 
  form, 
  general 
  appearance, 
  and 
  length 
  of 
  rostrum, 
  this 
  species 
  is 
  

   intermediate 
  between 
  C. 
  glacialis 
  and 
  C. 
  rostrata, 
  but 
  the 
  umbos 
  are 
  

   more 
  oblique 
  and 
  there 
  are 
  obvious 
  differences 
  in 
  the 
  hinge. 
  

  

  One 
  live 
  specimen 
  {^o. 
  78789), 
  station 
  2714, 
  N. 
  lat. 
  38° 
  22', 
  W. 
  long. 
  

   70° 
  17' 
  30", 
  in 
  1,825 
  fathoms, 
  1886. 
  

  

  