﻿Entomostrdca 
  from 
  Egypt 
  and 
  the 
  Soudan. 
  31 
  

  

  prominence 
  of 
  the 
  preanal 
  angle, 
  the 
  very 
  regularly 
  placed 
  

   postanal 
  denticles 
  (fig. 
  6), 
  and 
  the 
  shorter 
  and 
  broader 
  post- 
  

   abdomen. 
  The 
  latter 
  difference 
  is, 
  perhaps, 
  attributable 
  to 
  

   immaturity, 
  but 
  the 
  remains 
  are 
  too 
  incomplete 
  for 
  satis- 
  

   factory 
  identification. 
  

  

  COPEPOPA. 
  

  

  (23) 
  Diaptomus 
  galebi, 
  Barrois. 
  

  

  In 
  pools 
  in 
  the 
  Zoological 
  Gardens 
  at 
  Cairo, 
  at 
  Lecht, 
  and 
  

   by 
  the 
  Pyramids 
  ; 
  abundant. 
  Also 
  found 
  in 
  the 
  Blue 
  and 
  

   the 
  White 
  Nile. 
  

  

  (24) 
  Diaptomus 
  alluaudi, 
  De 
  Guerne 
  & 
  Richard. 
  

  

  Pools 
  by 
  the 
  road 
  to 
  the 
  Pyramids, 
  Sakkara, 
  Lecht, 
  

   Dahchour 
  ; 
  a 
  common 
  species. 
  A 
  few 
  specimens 
  were 
  also 
  

   found 
  in 
  the 
  Birket 
  el 
  Kurun, 
  but 
  it 
  is 
  evidently 
  not 
  common 
  

   there. 
  

  

  (25) 
  Diaptomus 
  salinus, 
  Daday. 
  

  

  Only 
  found 
  in 
  the 
  Birket 
  el 
  Kurun, 
  where, 
  with 
  Moina 
  

   salinarum, 
  it 
  forms 
  the 
  bulk 
  of 
  the 
  plankton. 
  

  

  My 
  specimens 
  agree 
  in 
  almost 
  all 
  respects 
  with 
  the 
  

   descriptions 
  of 
  Schmeil 
  and 
  others 
  and 
  with 
  specimens 
  from 
  

   Algeria, 
  but 
  they 
  differ 
  in 
  the 
  shape 
  of 
  the 
  last 
  thoracic 
  

   segment 
  and 
  the 
  first 
  abdominal 
  segment 
  of 
  the 
  female. 
  

   The 
  last 
  thoracic 
  segment 
  is 
  scarcely 
  at 
  all 
  produced 
  into 
  

   " 
  wings, 
  " 
  being 
  simply 
  rounded 
  behind 
  on 
  the 
  left 
  side 
  and 
  

   armed 
  with 
  two 
  small 
  spines, 
  while 
  on 
  the 
  right 
  side 
  it 
  is 
  

   produced 
  into 
  a 
  short 
  outwardly 
  directed 
  point. 
  The 
  first 
  

   abdominal 
  segment 
  is 
  very 
  short 
  and 
  slightly 
  asymmetrical, 
  

   the 
  spine 
  on 
  the 
  left 
  side 
  being 
  larger 
  than 
  that 
  on 
  the 
  

   right. 
  The 
  proportional 
  lengths 
  of 
  the 
  furca 
  and 
  the 
  abdo- 
  

   minal 
  segments 
  are, 
  on 
  an 
  average, 
  as 
  follows 
  : 
  — 
  

  

  Abdominal 
  segments. 
  

  

  ( 
  ' 
  v 
  ^ 
  Furca. 
  

  

  1. 
  2. 
  3. 
  

  

  Leneth 
  13 
  5 
  8 
  11 
  

  

  (2G) 
  Cyclops 
  leuckarti, 
  Clau*. 
  

  

  Abydos, 
  near 
  the 
  Pyramids, 
  Sakkara, 
  White 
  Nile, 
  and 
  

   Blue 
  Nile. 
  

  

  