﻿362 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  io3 
  

  

  toxis 
  Rafinesque 
  1819 
  over 
  Anculosa 
  Say 
  1821 
  so 
  clearly 
  that 
  Walker's 
  

   1918 
  refusal 
  to 
  follow 
  this 
  needed 
  correction 
  of 
  nomenclature 
  appears 
  

   at 
  present 
  to 
  be 
  only 
  a 
  prejudiced 
  personal 
  objection 
  to 
  the 
  change. 
  

   As 
  in 
  other 
  similar 
  cases, 
  most 
  American 
  authors, 
  especially 
  those 
  

   concerned 
  with 
  biology 
  rather 
  than 
  nomenclature, 
  from 
  1918 
  to 
  date 
  

   have 
  followed 
  Walker 
  not 
  because 
  they 
  had 
  critically 
  checked 
  the 
  

   generic 
  names 
  used 
  by 
  him, 
  but 
  simply 
  because 
  it 
  was 
  the 
  most 
  recent 
  

   comprehensive 
  classification 
  outline 
  for 
  North 
  American 
  fresh-water 
  

   shells. 
  As 
  stated 
  elsewhere, 
  this 
  incorrect 
  usage 
  following 
  Walker 
  

   dates 
  only 
  from 
  Walker, 
  and 
  has 
  only 
  33 
  years 
  standing, 
  which 
  is 
  not 
  

   enough 
  to 
  even 
  raise 
  any 
  questions 
  of 
  usage 
  over 
  priority 
  of 
  names. 
  

  

  For 
  the 
  record 
  Chenu 
  states 
  (Haldeman, 
  1847-1848, 
  p. 
  1, 
  footnote) 
  

   that 
  he 
  and 
  not 
  Haldeman 
  put 
  the 
  name 
  Leptoxis 
  of 
  Rafinesque 
  on 
  

   Haldeman's 
  pictorial 
  monograph 
  of 
  the 
  genus. 
  Thus 
  Chenu, 
  and 
  

   Pilsbry 
  by 
  formally 
  designating 
  praerosa 
  as 
  genotype 
  in 
  1917, 
  com- 
  

   pletely 
  cleared 
  up 
  all 
  doubts, 
  concerning 
  Rafinesque's 
  genus, 
  which 
  had 
  

   existed 
  prior 
  to 
  1848. 
  

  

  Genus 
  Eurycaelon 
  Lea, 
  1864 
  

  

  Eurycaelon 
  of 
  Lea 
  (1864, 
  p. 
  3) 
  has 
  as 
  genotype 
  Eurycaelon 
  anthonyi 
  

   (Redfield) 
  by 
  subsequent 
  designation 
  by 
  Walker 
  (1918, 
  p. 
  36). 
  The 
  

   two 
  known 
  species, 
  Eurycaelon 
  crassa 
  (Haldeman) 
  1841 
  and 
  E. 
  

   anthonyi 
  (Redfield) 
  1854 
  are 
  confined 
  to 
  the 
  larger 
  rivers 
  of 
  the 
  upper 
  

   Tennessee 
  drainage 
  as 
  reported 
  by 
  Goodrich 
  (1931). 
  In 
  this 
  con- 
  

   nection 
  must 
  be 
  mentioned 
  the 
  fact 
  that 
  the 
  two 
  names 
  cristata 
  

   Anthony 
  (young 
  specimens) 
  and 
  anthonyi 
  Redfield 
  (adult 
  specimens) 
  

   were 
  published 
  simultaneously 
  in 
  April 
  1854, 
  according 
  to 
  the 
  printed 
  

   signature 
  dates 
  of 
  volume 
  6 
  of 
  the 
  Annals 
  of 
  the 
  Lyceum 
  of 
  Natural 
  

   History 
  of 
  New 
  York. 
  Goodrich, 
  acting 
  as 
  first 
  reviser, 
  selected 
  

   anthonyi 
  Redfield, 
  on 
  page 
  130 
  of 
  volume 
  6 
  of 
  the 
  above 
  Annals, 
  over 
  

   the 
  name 
  cristata 
  of 
  Anthony, 
  on 
  page 
  108, 
  which 
  he 
  placed 
  in 
  syn- 
  

   onymy. 
  In 
  this 
  way 
  Goodrich 
  avoided 
  a 
  confusing 
  change 
  of 
  name 
  

   of 
  the 
  genotype. 
  

  

  Genus 
  Pleurocera 
  Rafinesque, 
  1818 
  

  

  Pleurocera 
  of 
  Rafinesque 
  became 
  monotypic 
  in 
  1820 
  with 
  the 
  valid 
  

   publication 
  by 
  Rafinesque 
  of 
  Pleurocera 
  verucosa. 
  Try 
  on 
  in 
  1864 
  and 
  

   1873 
  did 
  not 
  include 
  the 
  genotype 
  in 
  his 
  usage, 
  so 
  his 
  usage 
  was 
  bio- 
  

   logically 
  and 
  nomenclatorially 
  wrong. 
  Pilsbry 
  in 
  1896 
  questioned 
  the 
  

   genotype. 
  Hannibal 
  (1912, 
  p. 
  169) 
  formally 
  designated 
  the 
  mono- 
  

   type 
  species 
  verrucosa 
  Rafinesque 
  as 
  the 
  genotype, 
  being 
  followed 
  cor- 
  

   rectly 
  by 
  Pilsbry 
  in 
  1917. 
  

  

  Bryant 
  Walker, 
  in 
  his 
  1918 
  classification, 
  continued 
  to 
  use 
  Tryon's 
  

   incorrect 
  name 
  for 
  the 
  genus 
  when 
  he 
  used 
  only 
  the 
  second 
  available 
  

  

  