﻿54 
  INTRODUCTION. 
  

  

  of 
  the 
  kidney, 
  and 
  are 
  nearly 
  three 
  times 
  as 
  long 
  as 
  

   broad. 
  

  

  In 
  Alytes 
  ohstetricans 
  the 
  testes 
  are 
  subspherical 
  or 
  

   shortly 
  oval, 
  yellow, 
  usually 
  more 
  or 
  less 
  sprinkled 
  

   over 
  with 
  black 
  pigment. 
  There 
  are 
  two 
  vasa 
  effe- 
  

   rentia, 
  which 
  do 
  not 
  open 
  Id 
  to 
  the 
  kidney 
  but 
  pass 
  into 
  

   the 
  Miillerian 
  duct, 
  which 
  functions 
  as 
  a 
  seminal 
  duct 
  

   distinct 
  from 
  the 
  ureter, 
  and 
  bears, 
  as 
  a 
  diverticulum, 
  

   a 
  large 
  strongly 
  pigmented 
  vesicula 
  seminis. 
  

  

  In 
  Pehhates 
  fuscus 
  the 
  testes 
  are 
  oval, 
  flattened, 
  

   their 
  length 
  one-third 
  to 
  three-fourths 
  that 
  of 
  the 
  

   kidneys, 
  the 
  anterior 
  extremity 
  of 
  which 
  they 
  nearly 
  

   reach; 
  they 
  are 
  yellow, 
  rarely 
  feebly 
  pigmented. 
  A 
  

   vesicula 
  seminis 
  is 
  absent. 
  

  

  Felodytes 
  jpunctatus 
  agrees 
  very 
  closely 
  with 
  the 
  

   precedingc 
  The 
  testes 
  are 
  small, 
  measuring 
  only 
  one- 
  

   third 
  the 
  length 
  of 
  the 
  kidney, 
  and 
  much 
  pigmented, 
  

   nearly 
  black. 
  

  

  In 
  Bufo 
  vulgaris 
  the 
  testes 
  are 
  yellow, 
  sometimes 
  

   more 
  or 
  less 
  pigmented, 
  elongate, 
  cylindroid 
  or 
  

   flattened, 
  two 
  or 
  three 
  times 
  as 
  long 
  as 
  broad, 
  one- 
  

   half 
  to 
  three-fourths 
  the 
  length 
  of 
  the 
  kidney, 
  to 
  the 
  

   anterior 
  extremity 
  of 
  which 
  they 
  usually 
  do 
  not 
  

   extend. 
  A 
  vesicula 
  seminis 
  is 
  absent. 
  In 
  B. 
  viridis 
  

   the 
  testes 
  may 
  be 
  shorter, 
  more 
  oval, 
  or 
  cylindroid, 
  

   and 
  more 
  than 
  half 
  as 
  long 
  as 
  the 
  kidney; 
  they 
  are 
  

   more 
  or 
  less 
  strongly 
  pigmented, 
  sometimes 
  entirely 
  

   black, 
  and 
  do 
  not 
  extend 
  to 
  the 
  anterior 
  extremitv 
  

   of 
  the 
  kidney. 
  B. 
  calamita 
  has 
  the 
  testes 
  elongate, 
  

   and, 
  as 
  in 
  B. 
  viridis, 
  they 
  are 
  situated 
  opposite 
  the 
  

   middle 
  of 
  the 
  kidney; 
  they 
  are 
  so 
  strongly 
  pigmented 
  

   as 
  to 
  appear 
  entirely 
  or 
  nearly 
  entirely 
  black. 
  

  

  In 
  Ryla 
  arhorea 
  the 
  testes 
  are 
  yellow, 
  and 
  resemble 
  

   those 
  of 
  Bufo 
  vvlgaris 
  in 
  size, 
  form, 
  and 
  position. 
  A 
  

   vesicula 
  seminis 
  is 
  present. 
  

  

  In 
  Rana 
  esculenta 
  the 
  testes 
  are 
  yellow 
  or 
  orange, 
  

   short, 
  oval, 
  not 
  half 
  the 
  length 
  of 
  the 
  kidneys, 
  to 
  the 
  

   middle 
  of 
  which 
  they 
  are 
  attached 
  ; 
  the 
  vesicula 
  

   seminis 
  is 
  confounded 
  with 
  the 
  ureter, 
  which 
  is 
  of 
  

  

  