﻿BEEP- 
  WA 
  TER 
  MOLL 
  USCA— 
  VEBBILL 
  AND 
  B 
  USE. 
  827 
  

  

  CHLAMYS 
  Bolten, 
  1798. 
  

  

  Chlamiis 
  Boltkn, 
  Mns. 
  liolt., 
  1st 
  ed., 
  p. 
  1(55, 
  1798, 
  restricted. 
  — 
  Fischer, 
  1887 
  

  

  ipara). 
  

   Pecien 
  Schumacher, 
  1817 
  (restricted). 
  — 
  Verrill, 
  Trans. 
  Conn. 
  Acad., 
  X, 
  pp. 
  58, 
  

  

  89, 
  91, 
  1897. 
  

   Pecten 
  {pars) 
  and 
  Chlami/s 
  (pars) 
  H. 
  ;ind 
  A. 
  Adams, 
  1858. 
  — 
  Cuenu, 
  1862. 
  — 
  ZiT- 
  

  

  TJ5L, 
  1881. 
  

   Pecten 
  Stoliczka, 
  1871 
  (restricted). 
  

  

  Type. 
  — 
  Ghlamys 
  islandica 
  (Miiller). 
  

  

  The 
  original 
  tyi)e 
  of 
  this 
  genus 
  is 
  identical 
  with 
  P. 
  islaudiens 
  (Miiller). 
  

   Therefore 
  this 
  should 
  be 
  adoi)ted, 
  without 
  question, 
  as 
  the 
  true 
  type, 
  as 
  

   has 
  been 
  done 
  by 
  Fisciier 
  and 
  others. 
  

  

  The 
  typical 
  si)ecies 
  of 
  Ghlamys 
  are 
  high, 
  rounded, 
  somewhat 
  oblique, 
  

   nearly 
  eijuivalve 
  shells, 
  with 
  large 
  inequilateral 
  and 
  oblique 
  auricles, 
  

   a 
  large 
  byssal 
  notch, 
  and 
  several 
  pectinidial 
  teeth. 
  The 
  surface 
  

   is 
  strongly 
  radially 
  sculptured, 
  with 
  both 
  primary 
  and 
  numerous 
  

   interpolated 
  ribs, 
  increasing 
  in 
  number 
  with 
  age. 
  The 
  ribs 
  are 
  gener- 
  

   ally 
  crossed 
  by 
  concentric 
  sculpture, 
  often 
  forming 
  rough, 
  scale-like 
  

   projections. 
  The 
  margins 
  are 
  scalloped 
  and 
  the 
  shell 
  closes 
  rather 
  

   tightly 
  except 
  at 
  the 
  byssal 
  area. 
  The 
  inner 
  surface 
  has 
  ribs 
  and 
  

   double 
  tlutings, 
  corresponding 
  to 
  the 
  external 
  grooves 
  and 
  radii. 
  The 
  

   hinge-plate 
  has 
  generally 
  two 
  slightly 
  divergent 
  ribs 
  on 
  each 
  end. 
  

  

  PALLIUM 
  Schumacher, 
  1817. 
  

  

  PalUnm 
  Schumacher, 
  1817. 
  — 
  H. 
  and 
  A. 
  Adams, 
  1858. 
  — 
  Chenu, 
  1862. 
  — 
  Stoliczka, 
  

   1871.— 
  ZiTTEL, 
  1881.— 
  Fischer, 
  1887. 
  — 
  Verrill, 
  Trans. 
  Conn. 
  Acad., 
  X, 
  pp. 
  

   59, 
  89, 
  91, 
  pi. 
  XXI, 
  fig. 
  4, 
  1897. 
  

  

  Deutipecten 
  Rippel, 
  1835. 
  

  

  Type. 
  — 
  Pallium 
  ijlica 
  (LiniuTus). 
  

  

  The 
  special 
  feature 
  of 
  this 
  very 
  distinct 
  grouii 
  is 
  the 
  dovelo]>ment 
  of 
  

   several 
  (usually 
  three) 
  well-marked, 
  nearly 
  transverse, 
  blunt 
  teeth, 
  

   alternating 
  with 
  distinct 
  pits 
  on 
  each 
  end 
  of 
  the 
  hinge-plate. 
  The 
  

   shell 
  is 
  elevated, 
  rather 
  thick, 
  with 
  external, 
  large, 
  obtuse 
  or 
  rounded 
  

   racial 
  ribs 
  or 
  corrugations, 
  and 
  with 
  internal, 
  angular, 
  double 
  or 
  bicari- 
  

   nate 
  ribs 
  opposite 
  the 
  external 
  grooves, 
  near 
  the 
  margin. 
  The 
  auricles 
  

   are 
  small, 
  but 
  high. 
  The 
  hinge-teeth 
  are 
  marked 
  with 
  distinct 
  cross 
  

   lines. 
  

  

  HINNITES 
  Defrance, 
  1821. 
  

  

  /7*w»/<fs 
  Verrill, 
  Trans. 
  Conn. 
  Acad., 
  X, 
  pp. 
  .^9, 
  89, 
  91, 
  1897. 
  

  

  Type. 
  — 
  Hinnites 
  cortessi 
  Defrance. 
  

  

  Shell 
  free 
  and 
  much 
  like 
  CJilamys, 
  when 
  young, 
  but 
  later 
  in 
  life 
  it 
  

   becomes 
  attached 
  by 
  the 
  right 
  valve 
  and 
  irregular. 
  

  

  