﻿new 
  Leech, 
  from 
  Egypt. 
  

  

  389 
  

  

  Crop 
  witli 
  seven 
  pairs 
  of 
  caeca. 
  

  

  Anus 
  situated 
  between 
  the 
  two 
  rings 
  of 
  somite 
  xxvii. 
  and 
  

   separated 
  by 
  one 
  ring 
  from 
  the 
  posterior 
  sucker. 
  

  

  Size 
  of 
  the 
  largest 
  example, 
  in 
  a 
  medium 
  state 
  of 
  contrac- 
  

   tion, 
  14*5 
  mm. 
  long 
  and 
  5 
  mm. 
  wide. 
  

  

  Plucohdella 
  cegyptiaca, 
  sp. 
  n. 
  

  

  Diagram 
  showing 
  dorsal 
  surface, 
  part 
  of 
  anterior 
  ventral 
  surface, 
  annula- 
  

   tion, 
  digestive 
  tract, 
  &c. 
  Somites 
  indicated 
  in 
  Roman 
  figures, 
  rings 
  

   numbered 
  in 
  italics, 
  mth., 
  mouth 
  ; 
  pb.s., 
  proboscis-sheath 
  ; 
  cr., 
  

   crop 
  ; 
  st., 
  stomach 
  ; 
  int., 
  intestine 
  ; 
  an., 
  anus. 
  

  

  The 
  nearly 
  terminal 
  mouth, 
  the 
  seven 
  pairs 
  of 
  crop-cgeca, 
  

   and 
  the 
  fact 
  that 
  its 
  host 
  is 
  a 
  tortoise 
  place 
  this 
  leech 
  beyond 
  

   doubt 
  in 
  the 
  Glossosiphonid 
  genus 
  Placobdella 
  (R. 
  Blanchard, 
  

   1893). 
  Another 
  small 
  species 
  of 
  Placobdella 
  closely 
  re- 
  

   sembling 
  the 
  one 
  under 
  consideration, 
  recently 
  sent 
  to 
  me 
  

   from 
  India 
  for 
  identification 
  and 
  not 
  yet 
  described, 
  preys 
  

   upon 
  Trionyx 
  gangeticus. 
  

  

  