﻿NO. 
  1139. 
  DEEP-WATER 
  MOLLUSCA—VEBBILL 
  AND 
  BUSH. 
  803 
  

  

  CUSPIDARIA 
  ARCTICA 
  (M. 
  Sars) 
  Dall. 
  

  

  (Plates 
  LXXI, 
  tig. 
  2; 
  LXXIV, 
  tig. 
  7.) 
  

  

  Nea'ra 
  arciica 
  Sars, 
  G. 
  O., 
  Mollusca 
  Eeg. 
  Arcticse 
  Norvegire, 
  p. 
  85, 
  pi. 
  6, 
  tigs. 
  5, 
  

   a-c, 
  1878. 
  — 
  Smith, 
  E. 
  A., 
  Report 
  Voy. 
  Challevyer, 
  Zool. 
  Lamellibranchiata, 
  

   XIII, 
  p. 
  35, 
  1885. 
  

  

  Cuspidaria 
  arctica 
  Dall, 
  Bull. 
  Mas. 
  Comp. 
  Zool., 
  XII, 
  p. 
  291, 
  1886. 
  

  

  Not 
  Newra 
  arciica 
  Yerrill, 
  Amer. 
  Joiini. 
  Science, 
  YI, 
  p. 
  440, 
  1873. 
  

  

  A 
  single 
  imperfect 
  valve 
  from 
  station 
  70, 
  south 
  of 
  Halifax, 
  Nova 
  

   Scotia, 
  in 
  190 
  fathoms, 
  is 
  referred 
  to 
  this 
  species. 
  Though 
  worn 
  and 
  

   slightly 
  broken, 
  it 
  agrees 
  closely 
  with 
  Sars' 
  figure, 
  but 
  it 
  cannot 
  be 
  fully 
  

   grown, 
  for 
  it 
  measures 
  but 
  14 
  mm. 
  in 
  length 
  and 
  11 
  mm. 
  in 
  height. 
  

  

  CUSPIDARIA 
  FORMOSA, 
  new 
  species. 
  

   (Plates 
  LXXIY, 
  tig. 
  6; 
  LXXIX, 
  tig. 
  9.) 
  

  

  Shell 
  short, 
  high, 
  and 
  swollen. 
  Umbos 
  prominent.; 
  beaks 
  incurved. 
  

   Anterior 
  portion 
  broadly 
  rounded, 
  a 
  little 
  produced 
  at 
  the 
  end, 
  with 
  the 
  

   dorsal 
  margin 
  convex 
  and 
  a 
  little 
  excurved; 
  the 
  ventral 
  margin 
  is 
  

   broadly 
  and 
  evenly 
  rounded; 
  the 
  rostrum 
  is 
  short, 
  broad 
  at 
  base, 
  much 
  

   tapered; 
  the 
  postero-dorsal 
  margin 
  is 
  nearly 
  straight 
  at 
  first, 
  then 
  

   slightly 
  concave 
  and 
  a 
  little 
  upturned. 
  The 
  exterior 
  is 
  covered 
  with 
  

   uneven 
  lines 
  of 
  growth 
  between 
  which 
  the 
  surface 
  is 
  microscopically 
  

   striated 
  and 
  more 
  or 
  less 
  iridescent. 
  The 
  color 
  of 
  the 
  single 
  specimen 
  

   is 
  pale 
  pink, 
  externally 
  and 
  internally. 
  The 
  right 
  valve 
  has 
  a 
  promi- 
  

   nent, 
  triangular 
  lateral 
  tooth 
  with 
  its 
  base 
  prolonged 
  parallel 
  to 
  the 
  

   margin 
  of 
  the 
  shell 
  ; 
  it 
  is 
  separated 
  by 
  a 
  decided 
  notch 
  from 
  the 
  cartilage- 
  

   plate, 
  which 
  is 
  of 
  moderate 
  size, 
  ovate, 
  somewhat 
  oblique, 
  with 
  its 
  inner 
  

   edge 
  rounded 
  and 
  prominent. 
  

  

  Length, 
  about 
  16 
  mm,; 
  height, 
  13 
  mm.; 
  breadth, 
  10 
  mm.; 
  beak 
  to 
  end 
  

   of 
  rostrum, 
  about 
  9 
  mm.; 
  beak 
  to 
  anterior 
  end, 
  8 
  mm. 
  

  

  A 
  single, 
  much 
  broken, 
  specimen 
  (Xo. 
  78313), 
  station 
  2706, 
  N. 
  hit. 
  41° 
  

   28', 
  W. 
  long. 
  65° 
  35', 
  in 
  1,188 
  fathoms, 
  1886. 
  

  

  CUSPIDARIA 
  FRATERNA, 
  new 
  species. 
  

   (Plates 
  LXXI, 
  tigs. 
  7, 
  8; 
  LXXY, 
  tig. 
  6.) 
  

  

  Shell 
  similar 
  to 
  Cuspidaria 
  obesa 
  (Loven), 
  moderately 
  large, 
  consider- 
  

   ably 
  swollen, 
  rather 
  thick 
  and 
  firm 
  for 
  the 
  genus, 
  with 
  a 
  moderately 
  

   long, 
  tapered 
  rostrum. 
  The 
  umbos 
  are 
  rather 
  prominent 
  and 
  swollen, 
  

   with 
  the 
  strongly 
  incurved 
  beaks 
  nearly 
  in 
  contact. 
  The 
  anterior 
  end 
  

   is 
  broadly 
  rounded 
  with 
  a 
  regularly 
  curved, 
  convex 
  dorsal 
  edge 
  which 
  

   rises 
  nearly 
  to 
  the 
  height 
  of 
  the 
  umbos; 
  the 
  ventral 
  margin 
  is 
  a 
  little 
  

   protuberant. 
  The 
  postero-dorsal 
  line 
  slopes 
  with 
  a 
  slightly 
  concave 
  

   outline 
  to 
  the 
  end 
  of 
  the 
  rostrum 
  ; 
  on 
  the 
  ventral 
  margin 
  there 
  is 
  a 
  dis- 
  

   tinct 
  incurvature 
  corresj)onding 
  to 
  a 
  wave-like 
  depression 
  on 
  the 
  surface, 
  

  

  