﻿22 
  Dr. 
  L. 
  Plate 
  on 
  Noctiluca 
  miliaria, 
  Sur. 
  

  

  in 
  intermedia 
  or 
  gladiator, 
  and 
  if 
  fractured 
  near 
  the 
  base 
  we 
  

   should 
  get 
  the 
  short 
  thick 
  rostrum 
  characteristic 
  of 
  brevi- 
  

   rostris. 
  

  

  However, 
  I 
  by 
  no 
  means 
  wish 
  it 
  to 
  be 
  understood 
  that 
  I 
  

   bind 
  myself 
  to 
  the 
  theory 
  here 
  propounded; 
  for 
  when 
  

   attempting 
  to 
  estimate 
  the 
  probabilities 
  of 
  the 
  truth 
  or 
  falsity 
  

   of 
  it 
  I 
  am 
  compelled 
  to 
  admit 
  that 
  there 
  are 
  many 
  difficulties 
  

   in 
  the 
  way 
  of 
  its 
  adoption, 
  and 
  that 
  the 
  facts 
  of 
  the 
  case, 
  so 
  

   far 
  as 
  they 
  are 
  known, 
  are 
  rather 
  in 
  favour 
  of 
  the 
  view 
  of 
  the 
  

   distinctness 
  of 
  the 
  species 
  named. 
  This 
  view 
  I 
  have 
  conse- 
  

   quently 
  chosen, 
  and 
  have 
  put 
  forward 
  the 
  other 
  hypothesis 
  

   as 
  a 
  possibly 
  plausible 
  explanation 
  of 
  the 
  phenomena 
  

   presented 
  with 
  the 
  full 
  knowledge 
  that 
  it 
  can 
  only 
  be 
  satis- 
  

   factorily 
  tested 
  by 
  the 
  careful 
  examination 
  of 
  far 
  more 
  

   material 
  than 
  is 
  contained 
  in 
  the 
  present 
  collection. 
  

  

  EXPLANATION 
  OF 
  PLATE 
  II. 
  

  

  Fig. 
  1. 
  Front 
  of 
  Pseudotelphusa 
  tenuipes, 
  sp. 
  n. 
  (nat. 
  size, 
  small 
  speci- 
  

   men). 
  

  

  Fig. 
  1 
  a. 
  Fourth 
  pereiopod 
  of 
  Pseudotelphusa 
  tenuipes 
  (nat. 
  size, 
  small 
  

   specimen). 
  

  

  Fig. 
  2. 
  Rostrum 
  of 
  Bithynis 
  appuni 
  (v. 
  Martens), 
  nat. 
  size. 
  

  

  Fig. 
  3. 
  Atya 
  occidentalis 
  (Newp.), 
  two 
  thirds 
  nat. 
  size 
  of 
  largest 
  speci- 
  

   men. 
  

  

  Fig. 
  3 
  a. 
  Atya 
  occidentalis 
  (Newp.). 
  Third 
  pereiopod 
  of 
  half-sized, 
  

   specimen, 
  nat. 
  size. 
  

  

  Fig. 
  4. 
  Caridina 
  americana 
  (Guer.), 
  X 
  2. 
  

  

  Fig. 
  5. 
  Xiphocaris 
  brevirostris, 
  sp. 
  n., 
  nat. 
  size. 
  

  

  Fig. 
  5 
  a. 
  Xiphocaris 
  brevirostris, 
  sp. 
  n. 
  Rostrum. 
  

  

  Fig. 
  6. 
  Xiphocaris 
  gladiator, 
  sp. 
  n. 
  Rostrum. 
  

  

  Fig. 
  7. 
  Xiphocaris 
  gladiator, 
  var. 
  intermedia. 
  Rostrum. 
  

  

  Fig. 
  8. 
  Xiphocaris 
  elongata 
  (Guer. 
  ). 
  Rostrum. 
  

  

  Note. 
  — 
  In 
  the 
  figures 
  representing 
  the 
  rostra 
  of 
  the 
  several 
  species 
  of 
  

   Xiphocaris 
  the 
  ophthalmopod 
  has 
  heen 
  taken 
  as 
  of 
  the 
  same 
  length 
  in 
  

   each 
  case. 
  

  

  III. 
  — 
  Observations 
  on 
  Noctiluca 
  miliaria, 
  Suriray,and 
  the 
  

   Sea-luminosity 
  produced 
  by 
  it. 
  By 
  Dr. 
  L. 
  Plate 
  *. 
  

  

  During 
  a 
  stay 
  of 
  several 
  weeks 
  upon 
  the 
  island 
  of 
  Borkum 
  

   in 
  the 
  autumn 
  of 
  1886 
  I 
  subjected 
  Noctiluca 
  miliaris 
  to 
  a 
  

   thorough 
  investigation. 
  As, 
  however, 
  our 
  knowledge 
  of 
  this 
  

  

  * 
  ' 
  Zoologische 
  Jahrhucher,' 
  Abtheilung 
  fur 
  Anatomie 
  und 
  Ontogenie 
  

   der 
  Thiere, 
  Band 
  in. 
  pp. 
  174-180. 
  

  

  