﻿32G 
  On 
  the 
  Osteology 
  dec. 
  of 
  the 
  Order 
  Microcypr'mi. 
  

  

  moved 
  to 
  one 
  side 
  than 
  the 
  other, 
  is 
  usually 
  somewhat 
  curved 
  

   towards 
  that 
  side, 
  and 
  is 
  otherwise 
  not 
  quite 
  symmetrical; 
  

   the 
  urogenital 
  orifice 
  of 
  the 
  female 
  appears 
  to 
  be 
  median 
  and 
  

   symmetrical. 
  

  

  6. 
  Anablepinje. 
  

  

  The 
  remarkable 
  genus 
  Anableps, 
  with 
  three 
  species 
  from 
  

   Central 
  and 
  South 
  America, 
  shows 
  relationship 
  to 
  Jenynsia 
  

   in 
  the 
  structure 
  of 
  the 
  intromittent 
  organ, 
  but 
  has 
  a 
  number 
  

   of 
  other 
  characters 
  which 
  are 
  unique 
  in 
  the 
  suborder. 
  The 
  

   eyes 
  are 
  divided 
  transversely 
  into 
  an 
  upper 
  and 
  a 
  lower 
  

   portion, 
  the 
  former 
  raised 
  above 
  the 
  surface 
  of 
  the 
  head 
  and 
  

   adapted 
  for 
  vision 
  in 
  the 
  air. 
  The 
  skull 
  is 
  flat, 
  so 
  depressed 
  

   that 
  in 
  the 
  orbital 
  region 
  the 
  broad 
  parasphenoid 
  and 
  the 
  

   frontals 
  are 
  separated 
  by 
  a 
  scarcely 
  perceptible 
  interspace 
  ; 
  

   the 
  frontals 
  are 
  raised 
  above 
  the 
  orbits 
  ; 
  there 
  are 
  no 
  post- 
  

   cleithraand 
  the 
  pelvic 
  bones 
  are 
  well 
  separated; 
  the 
  vertebra 
  

   are 
  numerous 
  (46 
  to 
  53), 
  the 
  prajeaudals 
  with 
  strong 
  para- 
  

   pophyses 
  which 
  are 
  grooved 
  superiorly 
  and 
  have 
  the 
  ribs 
  

   attached 
  near 
  their 
  distal 
  extremities. 
  

  

  Garman's 
  account 
  of 
  this 
  genus 
  (' 
  The 
  Cyprinodonts/ 
  

   pp. 
  70-79, 
  pis. 
  vi. 
  & 
  vii.) 
  is 
  of 
  considerable 
  interest; 
  he 
  has 
  

   shown 
  that 
  both 
  males 
  and 
  females 
  are 
  " 
  rights 
  and 
  lefts;" 
  

   in 
  Anableps 
  anableps 
  the 
  female 
  urogenital 
  orifice 
  is 
  covered 
  

   by 
  an 
  enlarged 
  scale, 
  unattached 
  on 
  one 
  side 
  or 
  the 
  other, 
  so 
  

   as 
  to 
  open 
  to 
  the 
  right 
  or 
  left 
  ; 
  presumably 
  dextral 
  male* 
  

   pair 
  with 
  sinistral 
  females, 
  and 
  vice 
  versa. 
  

  

  7. 
  Pcecilunm. 
  

  

  The 
  fishes 
  of 
  this 
  subfamily 
  differ 
  from 
  all 
  the 
  others 
  of 
  the 
  

   order 
  in 
  the 
  absence 
  of 
  exoccipital 
  condyles. 
  They 
  are 
  vivi- 
  

   parous, 
  and 
  in 
  the 
  males 
  the 
  anal 
  fin 
  is 
  advanced 
  and 
  modified, 
  

   some 
  of 
  the 
  anterior 
  rays 
  being 
  enlarged 
  and 
  produced. 
  

   Eigennumn 
  has 
  studied 
  the 
  structure 
  of 
  this 
  intromittent 
  

   organ 
  in 
  the 
  Pceciliids 
  of 
  the 
  La 
  Plata 
  (Froc. 
  U.S. 
  Nat. 
  Mus. 
  

   xxxii. 
  1907, 
  p. 
  -425) 
  ; 
  he 
  has 
  found 
  that 
  it 
  is 
  the 
  third, 
  

   fourth, 
  and 
  fifth 
  rays 
  which 
  are 
  prolonged 
  ; 
  these 
  rays 
  may 
  

   be 
  rolled 
  up 
  to 
  form 
  a 
  tube, 
  or 
  they 
  may 
  be 
  armed 
  with 
  

   recurved 
  hooks 
  or 
  with 
  terminal 
  finger-like 
  or 
  antler-like 
  

   processes. 
  The 
  anal 
  fin 
  of 
  the 
  male 
  is 
  supported 
  by 
  special 
  

   bony 
  stays, 
  2 
  to 
  5 
  in 
  number, 
  which 
  project 
  downwards 
  and 
  

   forwards 
  from 
  the 
  bridges 
  connecting 
  the 
  parapophyses 
  of 
  

   some 
  of 
  the 
  posterior 
  prgecaudal 
  vertebras 
  (cf. 
  Garman, 
  ' 
  The 
  

   Cyprinodonts,' 
  pi. 
  viii.). 
  

  

  The 
  osteology 
  is 
  much 
  as 
  in 
  the 
  Fundulinre, 
  except 
  for 
  

  

  