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  PROC'EEDiyCH 
  OF 
  THE 
  XATIOXAL 
  MUSEUM. 
  vol.44. 
  

  

  Selenka, 
  E. 
  Die 
  Sipunculiden-Gattung 
  Phymosoma. 
  'Zool. 
  Anz., 
  vol. 
  20, 
  No. 
  546, 
  

  

  p. 
  460, 
  1897. 
  

   Sluiteh, 
  C. 
  Ph. 
  G6phyriens 
  (Sipunculides 
  et 
  Echiurides) 
  provenant 
  des 
  campagncs 
  

  

  de 
  VHirondelle 
  et 
  de 
  la 
  Princesse 
  Alice, 
  1886-1897. 
  Resultats 
  des 
  Campagnea 
  

  

  Scientifiques 
  par 
  Albert 
  ler. 
  Prince 
  de 
  Monaco. 
  Fascicule 
  XTV, 
  pp. 
  1-29, 
  3 
  pis. 
  

  

  Monaco, 
  1900. 
  

   Spengel, 
  J. 
  W. 
  Einige 
  Organisationsverhultnisse 
  von 
  Sipunciilusarten 
  und 
  ihre 
  

  

  Bedeutung 
  fiir 
  die 
  Systematik 
  dieser 
  Tiere. 
  Verb. 
  d. 
  Deutsch. 
  Zool. 
  Gesellsch- 
  

  

  22sten 
  Jahresversammlung 
  zu 
  Halle, 
  1912, 
  pp. 
  261-272. 
  

   Theel, 
  Hj. 
  Recherches 
  sur 
  le 
  Phascolion 
  strombi 
  Mont. 
  Kongl. 
  Svenska 
  Vet. 
  Akad. 
  

  

  Handl., 
  vol. 
  14, 
  No. 
  2. 
  Stockholm, 
  1875. 
  

   Northern 
  and 
  Arctic 
  Invertebrates 
  in 
  the 
  Swedish 
  State 
  Museum 
  (Riks, 
  

  

  museum). 
  I. 
  Sipunculids. 
  Kongl. 
  Svenska 
  Vet. 
  Akad. 
  Handl., 
  vol. 
  39, 
  No. 
  1. 
  

  

  pp. 
  1-102, 
  15 
  pis. 
  Uppsala, 
  1905. 
  

   Verrill, 
  a. 
  E. 
  Results 
  of 
  recent 
  Dredging 
  Expeditions 
  on 
  the 
  Coast 
  of 
  New 
  England. 
  

  

  Amer. 
  Jour. 
  Sci. 
  and 
  Arts, 
  ser. 
  3, 
  vol. 
  5, 
  1873, 
  p. 
  99. 
  

   ■ 
  Report 
  upon 
  the 
  Invertebrate 
  Animals 
  of 
  Vineyard 
  Sound 
  and 
  Adjacent 
  

  

  Waters. 
  Rept. 
  U. 
  S. 
  Comm. 
  Fish 
  and 
  Fisheries, 
  pt. 
  1, 
  1871-72, 
  pp. 
  295-778, 
  

  

  pis. 
  1-38. 
  Washington, 
  1873. 
  

  

  Explorations 
  of 
  Casco 
  Bay 
  by 
  the 
  U. 
  S. 
  F. 
  C. 
  in 
  1873. 
  Proc. 
  Amer. 
  Ass. 
  

  

  Adv. 
  Sci., 
  Salem, 
  1874, 
  pp. 
  340-395, 
  pis. 
  1-6. 
  

   Results 
  of 
  the 
  Explorations 
  made 
  by 
  the 
  Steamer 
  Albatross, 
  off 
  the 
  northern 
  

  

  coast 
  of 
  the 
  United 
  States 
  in 
  1883. 
  Rept. 
  U. 
  S. 
  Comm. 
  Fish 
  and 
  Fisheries, 
  pt.ll, 
  

   pp. 
  503-727, 
  pis. 
  1-44. 
  Washington, 
  1885. 
  

  

  EXPLANATION 
  OF 
  PLATES. 
  

   Plate 
  58. 
  

  

  Fig. 
  1. 
  Phascolosoma 
  margaritaceum 
  (Sars). 
  x 
  2. 
  

  

  2. 
  Phascolosoma 
  cijlindratujnKeieistem. 
  x 
  2. 
  

  

  3. 
  Phascolosoma 
  proccrum 
  Mcebius. 
  Nat. 
  size. 
  

  

  4. 
  Phascolosoma 
  crcmila 
  (Sars). 
  x 
  6. 
  . 
  

  

  5. 
  Phascolosoma 
  verrillii 
  Gerould. 
  x 
  2f 
  . 
  

  

  Plate 
  59. 
  

  

  Fig. 
  6. 
  Phascolosoma 
  cinctum, 
  new 
  species, 
  x 
  13J. 
  

  

  7. 
  Phascolosoma 
  verrillii 
  Gerould. 
  x 
  24^. 
  Drawn 
  from 
  a 
  live 
  young 
  specimen, 
  

  

  showing 
  the 
  peculiar 
  characteristic 
  of 
  the 
  species 
  under 
  adverse 
  conditions 
  

   of 
  partially 
  sloughing 
  the 
  cuticula 
  at 
  the 
  extremity 
  of 
  the 
  introvert. 
  

   Length 
  of 
  the 
  individual 
  expanded, 
  7-8 
  mm.; 
  and 
  5 
  mm. 
  in 
  ordinary 
  

   contraction. 
  Color, 
  light 
  brown 
  ; 
  ccelomic 
  corpuscles 
  purple 
  by 
  transmitted 
  

   light; 
  oc, 
  pigmented 
  eye. 
  

  

  8. 
  Dissection 
  of 
  P/jflscoZosoOTa 
  proccruwi 
  Mcebius. 
  x 
  2. 
  ^o, 
  reproductive 
  organs; 
  

  

  ncph., 
  nephridium; 
  n. 
  v., 
  ventral 
  nerve 
  cord; 
  oe., 
  esophagus; 
  tb., 
  Pol., 
  

   Polian 
  tube. 
  

  

  9. 
  Dendrosloma 
  alutaceum 
  Grube. 
  x 
  3. 
  

  

  Plate 
  60. 
  

  

  Fig. 
  10. 
  Tube 
  inhabited 
  by 
  Phascolion 
  strombi 
  (Montagu), 
  x 
  2. 
  From 
  station 
  

   210, 
  off 
  Cape 
  Ann. 
  

  

  11. 
  Papilla 
  from 
  base 
  of 
  introvert 
  of 
  Phascolion 
  strombi. 
  x 
  385. 
  

  

  12. 
  Head 
  and 
  tentacles 
  of 
  Phascolion 
  strombi. 
  x 
  3O3. 
  

  

  13. 
  Surface 
  view 
  of 
  Phascolion 
  strombi 
  var. 
  lasvis. 
  x 
  8. 
  

  

  14. 
  Siphonosoma 
  cumanense 
  (Keferstein), 
  from 
  Florida. 
  Nat. 
  size. 
  

  

  