﻿only 
  a 
  subgenus 
  of 
  

   Retusa, 
  Masc.) 
  

  

  c 
  ) 
  Genus 
  Khiz 
  o 
  ru 
  s 
  M 
  o 
  nt 
  - 
  

   fort 
  1810. 
  Tc-r. 
  rhiz 
  

   a 
  root. 
  Shaped 
  like 
  

   a 
  root. 
  Masc) 
  (For- 
  

   merly 
  listed 
  as 
  Vol- 
  

   v 
  ulella 
  ITewt 
  on 
  1891 
  . 
  

   ^Lat. 
  volvere, 
  to 
  

   turn 
  aDout, 
  to 
  roll. 
  

   Volvulella 
  is 
  fern, 
  

   Conmon 
  name 
  ;T/rapper 
  

   Shells.) 
  

  

  105 
  

   j 
  Py^unculus 
  o"besiu 
  sculu 
  s 
  Brugnone 
  ( 
  r 
  a 
  t 
  he 
  r 
  

   j 
  more 
  ohese, 
  fatter, 
  J" 
  

  

  [P 
  yrunculus 
  ovatus 
  Jeffreys 
  (ovate, 
  egg- 
  

   ' 
  shaped.) 
  

  

  j 
  Rhizorus 
  ac 
  utus 
  Orhigny 
  (pointed, 
  acute; 
  

   a.i 
  shaped 
  like 
  a 
  spindle.) 
  

   J 
  Rhizorus 
  as 
  pinosus 
  Dall 
  (without 
  spine; 
  

   I 
  dome- 
  like 
  apexTl 
  

   ' 
  Rhizorus 
  "bushi 
  Sai 
  l 
  ( 
  Bu 
  sh 
  ' 
  s 
  . 
  ) 
  

   j 
  Rhizorus 
  minutus 
  Bus 
  h 
  (minute; 
  is 
  proba- 
  

   i 
  iDly 
  a 
  young 
  specimen 
  of 
  Rhizorus 
  acutus.)! 
  

  

  R 
  hizoru 
  s 
  morchi 
  Dal 
  l 
  (named 
  for 
  Otto 
  An- 
  I 
  

   drea3"L. 
  Mcrch, 
  "a 
  naturalist, 
  1828-1878 
  .)j 
  

  

  Rhizo 
  r 
  us 
  oxytatus 
  Bush 
  (Gr, 
  very 
  sharp; 
  

  

  . 
  Vv'ith 
  a 
  sharp 
  spike-like 
  apex.) 
  

  

  i 
  9. 
  Fa 
  anily 
  Scaphandrid 
  ae 
  . 
  (Gr, 
  scaphe, 
  'bov/l, 
  anything 
  hollowed, 
  dug 
  

   out 
  boat 
  -- 
  aner, 
  andr-, 
  a 
  man; 
  boatman.) 
  

  

  I 
  Scaphand 
  e 
  r 
  nobilis 
  Verrill 
  (noble 
  , 
  ) 
  

  

  I 
  Scaphander 
  punctostriatus 
  Mighe 
  ls 
  ( 
  cover 
  - 
  

  

  ' 
  ed 
  with 
  punctate 
  striae. 
  1 
  

  

  Scaphander 
  w 
  at 
  soni 
  Dall 
  (named 
  in 
  honor 
  

   of^R. 
  Eoog-Watson, 
  of 
  the 
  "Challenger" 
  

   . 
  report.) 
  

  

  Scaphander 
  bat 
  h 
  ymophilus 
  D 
  all 
  (lover 
  of 
  

   ■ 
  the 
  depths; 
  'dredged 
  from 
  294 
  to 
  1568 
  

   :_ 
  fathoms, 
  ) 
  

  

  lO. 
  Family 
  Acteocinida 
  e. 
  (Diminutive 
  of 
  Acteon, 
  Little 
  Acteons.) 
  

  

  Genus 
  Scaphand 
  e 
  r 
  

   Montfort 
  ISloTTlJIasc) 
  

  

  Kiener 
  ( 
  inf]a 
  ted; 
  shell 
  

  

  a 
  ) 
  G 
  enus 
  Acteocina 
  Gra 
  y 
  

   1847. 
  (PemT) 
  

  

  b 
  ) 
  Genus 
  Cyli 
  chna 
  Love 
  n 
  

   184_6. 
  (Gr. 
  cylichne, 
  

   a 
  sma,ll 
  cup; 
  a 
  medi- 
  

   cine-box, 
  says 
  Jef- 
  

   freys. 
  Common 
  name: 
  

   Cup 
  Shells. 
  ?em. 
  ) 
  

  

  i 
  Ac 
  t 
  eocina 
  bull 
  a 
  t: 
  

  

  i 
  cylindricalTl 
  

  

  ! 
  Acteocina 
  recta 
  Orbigny 
  (straight; 
  

  

  I 
  straight 
  line 
  Acteocina.) 
  

  

  ' 
  Acteocina 
  eburnea 
  Verrill 
  (ivory. 
  ) 
  

  

  j 
  Ac 
  teocina 
  pe 
  r 
  plicata 
  Dall 
  (much 
  plaited; 
  

  

  i_ 
  marked 
  with 
  lines 
  of 
  growth 
  and 
  spirals.) 
  

  

  i 
  Cylichi: 
  a 
  alba 
  Brow 
  n 
  (white; 
  shell 
  of 
  a 
  

  

  i 
  dull 
  white 
  color,")" 
  

  

  ' 
  Cyli 
  chna 
  alba 
  corticata 
  Beck 
  (corticated; 
  

  

  heaving 
  an 
  outer 
  covering 
  or 
  periostra- 
  

  

  cum, 
  ) 
  

   Cylich 
  na 
  e 
  burnea 
  Verr 
  ill 
  (ivory; 
  ivory- 
  

  

  v;hi 
  t 
  e7y 
  

   Cylichna 
  occulta 
  Mighels 
  (hidden; 
  spire 
  

  

  is 
  concealed,") 
  

   Cylichna 
  gou 
  ldi 
  Couthouy 
  (named 
  for 
  Au- 
  

   "gustus 
  a'T 
  Gould, 
  M.D., 
  an 
  Araerican 
  na- 
  

   turalist, 
  1805-1866.) 
  I 
  

   Cylichna 
  verri 
  ll 
  i 
  Dal 
  l 
  (named 
  for 
  Profes-j 
  

  

  sor 
  Addison 
  E. 
  Verrill 
  of 
  Yale 
  Univer- 
  ; 
  

  

  sity, 
  1839-1927.) 
  

   Cy 
  lichna 
  v 
  ortex 
  Dall 
  (gulf, 
  abyss,; 
  apical 
  

  

  \7horl 
  sunk 
  in 
  a 
  shallow 
  pit 
  formed 
  by 
  

  

  the 
  two 
  successive 
  whorls,) 
  

  

  