﻿28 
  Mr. 
  R. 
  Guiney 
  on 
  smie 
  Freshwater 
  

  

  circle 
  of 
  reticulations 
  which 
  do 
  not 
  extend 
  over 
  the 
  egg- 
  

   space 
  itself 
  (PI. 
  II. 
  fig. 
  1). 
  The 
  male 
  resembles 
  that 
  of 
  

   M. 
  rectirostris 
  in 
  shape 
  and 
  in 
  the 
  form 
  of 
  the 
  first 
  leg 
  and 
  

   first 
  antenna, 
  but 
  differs 
  from 
  it 
  in 
  having 
  only 
  three 
  hooks 
  

   at 
  the 
  end 
  of 
  the 
  first 
  antenna 
  (fig. 
  2). 
  The 
  number 
  of 
  

   these 
  hooks 
  does 
  not 
  appear 
  to 
  be 
  quite 
  so 
  constant 
  a 
  

   character 
  as 
  has 
  been 
  supposed, 
  as 
  I 
  have 
  shown 
  (1909) 
  that 
  

   a 
  form 
  of 
  M. 
  rectirostris 
  occurs 
  in 
  Tunisia 
  in 
  which 
  the 
  male 
  

   has 
  only 
  four 
  hooks 
  in 
  place 
  of 
  five. 
  It 
  appears, 
  therefore, 
  

   that 
  the 
  differences 
  between 
  the 
  species 
  in 
  question 
  and 
  

   Moina 
  rectirostris 
  are 
  : 
  — 
  

  

  (1) 
  Its 
  small 
  size. 
  

  

  (2) 
  Small 
  number 
  of 
  teeth 
  on 
  the 
  postabdomen. 
  

  

  (3) 
  Less 
  pronounced 
  comb 
  on 
  the 
  postabdominal 
  claws. 
  

  

  The 
  presence 
  or 
  absence 
  of 
  transversely 
  arranged 
  

   cilia 
  on 
  the 
  postabdomen 
  has 
  been 
  shown 
  by 
  Ekman 
  

   not 
  to 
  be 
  distinctive. 
  

  

  (4) 
  There 
  is 
  a 
  slight 
  difference 
  between 
  the 
  proportions 
  in 
  

  

  the 
  two 
  species 
  between 
  the 
  prseanal 
  and 
  postanal 
  

  

  parts 
  of 
  the 
  postabdomen. 
  

   The 
  first 
  three 
  of 
  these 
  differences 
  seem 
  to 
  me 
  to 
  be 
  

   probably 
  accountable 
  by 
  the 
  limnetic 
  habit 
  of 
  the 
  species, 
  

   and 
  the 
  sum 
  of 
  the 
  differences 
  does 
  not 
  seem 
  to 
  amount 
  to 
  

   specific 
  distinction. 
  

  

  (13) 
  Moina 
  salinarum, 
  Gurney. 
  (PI. 
  II. 
  figs. 
  3, 
  4.) 
  

  

  In 
  the 
  plankton 
  of 
  the 
  Birket 
  el 
  Kurun 
  a 
  species 
  of 
  Moina 
  

   which 
  is 
  identical 
  with 
  that 
  recently 
  found 
  by 
  me 
  in 
  a 
  salt 
  

   lake 
  in 
  Tunisia, 
  and 
  described 
  under 
  the 
  name 
  M. 
  salinarum, 
  

   is 
  abundant. 
  There 
  is 
  no 
  perceptible 
  difference 
  between 
  the 
  

   two, 
  except 
  that 
  I 
  cannot 
  detect 
  in 
  the 
  Egyptian 
  specimens 
  

   any 
  cilia 
  on 
  the 
  first 
  pair 
  of 
  antennae. 
  I 
  give 
  a 
  figure 
  of 
  the 
  

   postabdomen 
  for 
  comparison 
  (fig. 
  3). 
  I 
  have 
  nothing 
  to 
  add 
  

   to 
  the 
  description 
  already 
  given, 
  except 
  that 
  the 
  first 
  leg 
  of 
  

   the 
  female 
  agrees 
  in 
  all 
  respects 
  with 
  that 
  of 
  M. 
  rectirostris. 
  

  

  No 
  ephippial 
  females 
  were 
  found, 
  but 
  a 
  few 
  males 
  occurred 
  

   in 
  a 
  collection 
  made 
  in 
  the 
  Lake 
  on 
  Feb. 
  20, 
  1909. 
  These 
  

   males 
  do 
  not 
  differ 
  in 
  any 
  important 
  respect 
  from 
  those 
  of 
  

   M. 
  rectirostris, 
  though 
  the 
  head 
  is 
  somewhat 
  longer 
  and 
  more 
  

   conical 
  and 
  the 
  depression 
  above 
  the 
  eye 
  is 
  very 
  slight. 
  The 
  

   form 
  of 
  the 
  first 
  leg 
  is 
  also 
  the 
  same. 
  On 
  the 
  other 
  hand, 
  

   the 
  shape 
  of 
  the 
  postabdomen 
  differs 
  in 
  the 
  same 
  way 
  as 
  does 
  

   that 
  of 
  the 
  female, 
  and 
  the 
  first 
  antennae 
  bear 
  four 
  hooks 
  

   instead 
  of 
  five. 
  In 
  one 
  male 
  a 
  distinct 
  trace 
  of 
  a 
  pigmented 
  

   ocellus 
  was 
  seen 
  (fig. 
  4). 
  

  

  