﻿Entomostraca 
  from 
  Egypt 
  and 
  the 
  Suudan. 
  29 
  

  

  The 
  occurrence 
  of 
  this 
  species 
  in 
  the 
  Birket 
  el 
  Kurun 
  

   seems 
  further 
  to 
  justify 
  the 
  specific 
  name, 
  as 
  it 
  appears 
  to 
  be 
  

   a 
  species 
  characteristic 
  of 
  water 
  of 
  a 
  high 
  salinity. 
  

  

  (14) 
  Ilyocryptus 
  sordidus, 
  Lievin. 
  

  

  Four 
  rather 
  immature 
  specimens 
  occurred 
  in 
  a 
  collection 
  

   made 
  in 
  a 
  canal 
  at 
  Lecht 
  which 
  runs 
  from 
  the 
  Nile 
  near 
  

   El-Wasta 
  northwards 
  as 
  far 
  as 
  the 
  barrage 
  below 
  Cairo. 
  

  

  A 
  much 
  mutilated 
  specimen 
  of 
  a 
  species 
  of 
  Ilyocryptus 
  

   was 
  found 
  in 
  the 
  Blue 
  Nile, 
  but 
  I 
  am 
  unable 
  to 
  identity 
  it 
  

   with 
  certainty. 
  In 
  the 
  form 
  of 
  the 
  postabdomen 
  it 
  agrees 
  

   most 
  closely 
  with 
  /. 
  longiremis, 
  Sars. 
  

  

  (15) 
  Camptocercus 
  australis, 
  Sars. 
  

  

  Found 
  in 
  the 
  sweet-water 
  canal 
  at 
  Port 
  Said 
  and 
  in 
  pools 
  

   in 
  the 
  Zoological 
  Gardens 
  at 
  Cairo. 
  Hitherto 
  the 
  species 
  

   has 
  been 
  recorded 
  only 
  from 
  the 
  Oriental 
  and 
  Neotropical 
  

   regions. 
  

  

  (16) 
  Alona 
  affinis, 
  Ley 
  dig. 
  

  

  Two 
  rather 
  decayed 
  specimens 
  were 
  found 
  in 
  the 
  Nile 
  

   near 
  Luxor. 
  

  

  I 
  cannot 
  agree 
  with 
  Keilhack 
  (1909) 
  in 
  regardiug 
  this 
  

   species 
  as 
  a 
  variety 
  only 
  of 
  Alona 
  quadrangular 
  is. 
  The 
  two 
  

   species 
  differ, 
  in 
  my 
  experience, 
  not 
  only 
  in 
  habit, 
  but 
  in 
  

   quite 
  constant 
  structural 
  features. 
  

  

  (17) 
  Alona 
  rectangula, 
  Sars. 
  (PI. 
  II. 
  fig. 
  5.) 
  

  

  In 
  pools 
  by 
  the 
  road 
  to 
  the 
  Pyramids 
  and 
  at 
  Dahchour. 
  

   Ekman 
  describes 
  specimens 
  from 
  Gizeh 
  and 
  the 
  White 
  Nile 
  

   which 
  he 
  refers 
  to 
  Alona 
  bukobensis, 
  Weltner, 
  but 
  it 
  seems 
  

   to 
  me 
  that 
  Daday 
  (1907) 
  is 
  right 
  in 
  considering 
  A. 
  buko- 
  

   bensis 
  as 
  a 
  synonym 
  of 
  A. 
  rectangula. 
  The 
  form 
  of 
  the 
  

   postabdomen 
  in 
  both 
  is 
  extremely 
  variable 
  and 
  the 
  variations 
  

   in 
  form 
  and 
  arrangement 
  of 
  the 
  denticles 
  evidently 
  overlap 
  

   each 
  other. 
  My 
  own 
  specimens 
  are 
  very 
  few 
  and 
  do 
  not 
  

   show 
  much 
  variation; 
  the 
  postabdomen 
  closely 
  resembles 
  

   that 
  of 
  the 
  typical 
  European 
  form 
  of 
  the 
  species 
  (fig. 
  5). 
  

  

  (18) 
  Leydigia 
  quadrangularis 
  , 
  Leydig. 
  

  

  Two 
  specimens 
  only 
  were 
  found 
  in 
  a 
  pool 
  in 
  the 
  Zoolo- 
  

   gical 
  Gardens 
  at 
  Cairo. 
  

  

  