﻿The 
  Fauna 
  of 
  the 
  Niagaea 
  Group. 
  191 
  

  

  Note 
  on 
  the 
  Genus 
  Dalmanites 
  and 
  Odontocephalus. 
  

  

  Cryph^eus 
  Green. 
  1837. 
  

   Odontocephalus 
  Qonrad. 
  1840. 
  

   Dalmania 
  and 
  Dalmanites 
  Emmrich. 
  1845. 
  

   Odontochile 
  Corda. 
  1847.* 
  

  

  The 
  genus 
  Dalmania 
  or 
  Dalmanites 
  of 
  Emmrich 
  has 
  been 
  

   generally 
  adopted 
  by 
  European 
  and 
  American 
  authors, 
  over- 
  

   looking 
  the 
  fact 
  that 
  Green, 
  in 
  1837, 
  proposed 
  the 
  name 
  

   Crypeleus, 
  and 
  Conrad, 
  in 
  1840, 
  proposed 
  the 
  name 
  Odon- 
  

   tocephalus 
  for 
  forms 
  now 
  included 
  under 
  Emmrich' 
  sgenus- 
  

   The 
  typical 
  _s&ssjes 
  of 
  Conrad's 
  genus 
  was 
  the 
  Asaphus 
  selen. 
  

   urus 
  of 
  Eaton, 
  described 
  in 
  1832. 
  

  

  In 
  1835, 
  Green, 
  in 
  the 
  supplement 
  to 
  his 
  Monograph 
  of 
  the 
  

   North 
  American 
  Trilobites, 
  described 
  the 
  head 
  of 
  a 
  Trilobite 
  

   under 
  the 
  name 
  of 
  Oalymene 
  odontocephala,\ 
  from 
  the 
  denti- 
  

   culate 
  character 
  of 
  the 
  anterior 
  margin 
  of 
  the 
  buckler 
  or 
  

   cephalic 
  shield. 
  This 
  species 
  of 
  Green 
  was 
  identified 
  among 
  

   the 
  collections 
  from 
  the 
  upper 
  limestones 
  of 
  the 
  Helderberg 
  

   and 
  Schoharie, 
  and 
  in 
  1840 
  Mr. 
  Conrad 
  discovered 
  an 
  entire 
  

   specimen 
  which 
  had 
  been 
  collected 
  at 
  Auburn, 
  N. 
  Y. 
  This 
  

   specimen 
  proved 
  that 
  the 
  Asaphus 
  selenurus, 
  Eaton, 
  of 
  which 
  

   only 
  the 
  caudal 
  shield 
  had 
  been 
  heretofore 
  known, 
  and 
  Oaly- 
  

   mene 
  odontocephala 
  of 
  Green, 
  described 
  from 
  the 
  head 
  alone, 
  

   were 
  one 
  and 
  the 
  same 
  species, 
  and 
  he 
  proposed 
  the 
  generic 
  

   name 
  of 
  Odontocephalus, 
  and 
  Odontoeephalus 
  selenurus 
  

   as 
  the 
  typical 
  species4 
  

  

  The 
  name 
  Odontocephalus 
  has, 
  therefore, 
  priority 
  over 
  

   Dalmania 
  by 
  five 
  years 
  in 
  time, 
  and 
  while, 
  although 
  natural- 
  

   ists 
  would 
  prefer 
  to 
  retain 
  the 
  use 
  of 
  the 
  name 
  Dalmania 
  or 
  

   Dalmanites, 
  (the 
  former 
  being 
  also 
  used 
  for 
  a 
  genus 
  of 
  dipter-v 
  

   ous 
  insects,) 
  it 
  becomes 
  a 
  question 
  whether 
  a 
  just 
  interpreta- 
  

   tion 
  of 
  the 
  rule 
  of 
  priority 
  would 
  not 
  require 
  the 
  adoption 
  of 
  

   the 
  name 
  Odontocephalus. 
  While 
  aware 
  of 
  the 
  fact 
  that 
  

   Mr. 
  Conrad 
  had 
  thus 
  described 
  the 
  Asaphus 
  selenurus 
  of 
  

   Eaton, 
  the 
  writer 
  has 
  in 
  former 
  publications 
  adopted 
  the 
  name 
  

   Dalmania 
  or 
  Dalmanites, 
  without 
  considering 
  the 
  question 
  of 
  

   dates. 
  

  

  * 
  The 
  generic 
  name 
  Cryph^eus, 
  proposed 
  by 
  Green 
  in 
  1837, 
  was 
  already 
  pre- 
  

   occupied 
  for 
  a 
  genus 
  of 
  Coleoptera 
  in 
  1833, 
  and 
  the 
  name 
  Odontochile 
  had 
  also 
  

   been 
  given 
  to 
  a 
  genus 
  of 
  Coleopterous 
  insects 
  in 
  1834. 
  

  

  + 
  Cast 
  No. 
  36 
  of 
  Green's 
  series 
  of 
  casts 
  of 
  Trilobites. 
  

  

  * 
  Third 
  An. 
  Report 
  Pal. 
  Dept. 
  N. 
  Y. 
  Geol. 
  Survey. 
  1840. 
  

  

  