﻿122 
  : 
  

  

  Family 
  Umbraculidae 
  . 
  (Lat, 
  umbraculum, 
  anything 
  that 
  furnishes 
  sha-! 
  

  

  de, 
  an 
  umbrella. 
  Umbrella- 
  shaped. 
  ) 
  \ 
  

  

  ^ 
  ) 
  Genus 
  Umbracul 
  um 
  

   S 
  c 
  hurnache 
  r 
  181 
  7 
  . 
  

   "TNeu'ter.y" 
  ~ 
  

  

  j 
  Umbracu 
  lum 
  bermudense 
  Mbrch 
  (from 
  Bermu- 
  j 
  

  

  I 
  dSTT" 
  I 
  

  

  I 
  U 
  mbraculum 
  plica 
  tu 
  lum 
  Marten 
  s 
  (folded, 
  ! 
  

   i 
  coiled; 
  plaitedTT 
  ' 
  

  

  i 
  Umbraculum 
  rushi 
  Pall 
  (named 
  for 
  Dr. 
  W. 
  

   I 
  H. 
  Rush, 
  U. 
  S. 
  Navy.) 
  

  

  Tylodina 
  ame 
  r 
  icana 
  Pall 
  ( 
  American. 
  ) 
  

  

  b 
  ) 
  Genus 
  Tylodi 
  na 
  Rafi- 
  

   nesgue 
  ,18,14 
  . 
  "Xgt 
  . 
  "~ 
  

   tylos, 
  a 
  knob, 
  cal- 
  

   lus. 
  Shell 
  with 
  a 
  

   callous 
  apex.Fem.) 
  

  

  F. 
  ORPSR 
  mJ 
  PIBR 
  AMCKIA 
  

  

  (Lat. 
  nudus, 
  naked 
  — 
  branchia, 
  gills. 
  Gills 
  are 
  mked 
  and 
  exposed.) 
  

  

  I. 
  SUP5 
  R7Alv:iLY 
  DORIDACE 
  A 
  

  

  (Named 
  after 
  Doris, 
  the 
  daughter 
  of 
  Oceanus 
  and 
  Tethys, 
  and 
  wife 
  of 
  

   Nereus, 
  a 
  sea-god.) 
  

  

  1, 
  Family 
  Pplyceridae 
  . 
  (Gr, 
  polys, 
  many 
  — 
  ceras, 
  horn; 
  with 
  many 
  lit- 
  

   tle 
  horns. 
  Appendages 
  to 
  the 
  branchiae 
  spur-like. 
  Spicules 
  on 
  the 
  

   skin. 
  ) 
  

  

  a) 
  Genus 
  Poly 
  cerella 
  

   Verrill 
  188 
  0. 
  TSarae 
  

   etymology 
  as 
  above, 
  

   Fem. 
  ) 
  

  

  Polycerella 
  dave 
  nporti 
  Balc 
  h 
  (Davenport'si 
  

   Po 
  lycerella 
  emertoni 
  Ver 
  r 
  ill 
  (named 
  for 
  

  

  J. 
  H. 
  Emerton, 
  artist 
  of 
  the 
  U. 
  S. 
  Fish 
  

  

  Commission. 
  ) 
  

  

  b 
  ) 
  Ge 
  nus 
  Is 
  sena 
  Ire 
  da- 
  ]" 
  

   le^ 
  & 
  o"''Donqghue 
  1925. 
  | 
  

  

  {Tat. 
  Issa, 
  an 
  island! 
  Isse 
  na 
  lacera 
  Ab 
  ildga 
  ard 
  (mutilated, 
  

  

  in 
  the 
  Adriatic. 
  As 
  • 
  torn 
  to 
  pieces.) 
  

  

  Issa 
  was 
  already 
  pre-' 
  Issena 
  ramosa 
  Verr 
  i 
  ll 
  & 
  Emerton 
  (ramose.) 
  

  

  occupied, 
  Iredale 
  andi 
  

  

  O'Donoghue 
  proposed 
  

  

  the 
  diminutive 
  Isse- 
  • 
  

  

  na, 
  Fem.) 
  

  

  c 
  ) 
  Genu 
  s 
  Pa 
  li 
  o 
  Gray 
  1 
  857. 
  - 
  

  

  (Lat, 
  pallium, 
  a 
  man- 
  i 
  Palio 
  lessoni 
  Or 
  bi 
  gny 
  (Lesson's.) 
  

   tie. 
  Masc.) 
  

  

  Family 
  Qn 
  c 
  hidoridid 
  ae.( 
  Gr. 
  oncos, 
  the 
  barb 
  of 
  an 
  arrow, 
  a 
  bend, 
  cur- 
  

   ve, 
  tumor; 
  tubercle 
  — 
  doris, 
  the 
  daughter 
  of 
  Oceanus 
  and 
  Tethys, 
  

   and 
  wife 
  of 
  Nereus, 
  a 
  sea-god.) 
  j 
  

  

  I 
  

   ! 
  On 
  chidoris 
  a 
  sp 
  ersa 
  Alder 
  & 
  Hanco 
  ck( 
  sprin-j 
  

   I 
  kled; 
  the 
  s'ides 
  are 
  sprinkled 
  with 
  o- 
  i 
  

   ! 
  paque 
  v/hite.) 
  

   i 
  O 
  nchidoris 
  diademata 
  Gould 
  (having 
  a 
  dia- 
  

   j 
  dera; 
  branchial 
  star 
  of 
  nine 
  plumes.) 
  

   ' 
  Onchidoris 
  d 
  iaph 
  ana 
  Alder 
  & 
  Hancock 
  (di- 
  

   ; 
  aphanous, 
  transparent, 
  ) 
  

  

  