﻿76 
  

  

  INTRODUCTION. 
  

  

  tail 
  is 
  about 
  equally 
  long, 
  and 
  provided 
  with 
  an 
  ex- 
  

   tremely 
  delicate, 
  wavy, 
  vibratile, 
  hyaline 
  membrane 
  

   or 
  crest. 
  As 
  in 
  the 
  newfcs, 
  they 
  are 
  collected 
  together 
  

   in 
  bundles, 
  although 
  devoid 
  of 
  a 
  spermatophore. 
  

  

  Fig. 
  29. 
  

  

  A 
  B 
  c 
  D 
  E 
  P 
  

  

  Spermatozoa 
  of 
  Bafcracliians. 
  A. 
  Bomhinator 
  pachypus. 
  B. 
  Pelo- 
  

   hates 
  fuscus. 
  c. 
  Bufo 
  vulgaris, 
  d. 
  Hyla 
  arhorea. 
  E. 
  Rana 
  

   esculenta'. 
  F. 
  Bana 
  temjporaria. 
  (After 
  La 
  Yalette 
  St. 
  George 
  

   and 
  Leydig.) 
  

  

  In 
  Bomhinator 
  a 
  crest 
  is 
  present 
  along 
  the 
  side 
  of 
  

   the 
  spindle-shaped 
  head, 
  and 
  the 
  tail 
  is 
  moderately 
  

   long, 
  filiform, 
  and 
  devoid 
  of 
  a 
  crest. 
  The 
  crest 
  may 
  

   be 
  partially 
  detached 
  from 
  the 
  head, 
  and 
  has 
  been 
  

   taken 
  to 
  belong 
  to 
  the 
  tail. 
  

  

  In 
  Alytes 
  and 
  Bufo 
  the 
  head 
  is 
  staff-shaped, 
  pointed 
  

   in 
  front 
  ; 
  the 
  tail 
  is 
  about 
  twice 
  as 
  long, 
  with 
  a 
  deli- 
  

   cate 
  crest. 
  

  

  In 
  Pelohates 
  the 
  head 
  is 
  long 
  and 
  thin, 
  with 
  strong 
  

   spiral 
  windings, 
  corkscrew-shaped, 
  passing 
  gradually 
  

   into 
  the 
  extremely 
  long, 
  delicate, 
  filiform 
  tail. 
  

  

  The 
  spermatozoa 
  of 
  Pelodytes 
  bear 
  much 
  resem- 
  

   blance 
  to 
  the 
  preceding, 
  but 
  the 
  head 
  is 
  less 
  twisted 
  ; 
  

   the 
  tail 
  is 
  also 
  extremely 
  long 
  and 
  filiform. 
  

  

  