﻿GEOLOGY. 
  277 
  

  

  The 
  Carcharodon 
  agustidens, 
  of 
  Agassiz, 
  lias 
  also 
  been 
  

   found 
  in 
  the 
  same 
  county. 
  These 
  species 
  occur 
  in 
  the 
  

   marls 
  of 
  Virginia, 
  and 
  are 
  there 
  referred 
  to 
  the 
  Miocene 
  

   period. 
  

  

  In 
  1843, 
  I 
  obtained 
  from 
  the 
  neighborhood 
  of 
  Long's 
  

   Quarry, 
  a 
  considerable 
  portion 
  of 
  the 
  remains 
  of 
  the 
  

   Basilosaurus 
  found 
  in 
  the 
  bank 
  of 
  Pearl 
  Eiver. 
  

  

  Joints 
  of 
  the 
  vertebra, 
  of 
  which 
  examples 
  may 
  be 
  

   seen 
  in 
  the 
  State 
  cabinet, 
  sometimes 
  measure 
  more 
  than 
  

   a 
  foot 
  in 
  length, 
  and 
  about 
  eight 
  inches 
  in 
  diameter, 
  

   giving 
  to 
  one 
  having 
  the 
  slightest 
  knowledge 
  of 
  compara- 
  

   tive 
  anatomy, 
  a 
  tolerable 
  conception 
  of 
  the 
  proportions 
  

   of 
  this 
  gigantic 
  animal 
  — 
  the 
  largest, 
  perhaps, 
  of 
  all 
  ani- 
  

   mals 
  whose 
  remains 
  have 
  ever 
  been 
  discovered, 
  being 
  

   from 
  eighty 
  to 
  one 
  hundred 
  feet 
  in 
  length. 
  

  

  Remains 
  of 
  this 
  animal 
  appear 
  first 
  to 
  have 
  been 
  

   noticed 
  in 
  Louisiana, 
  having 
  been 
  first 
  described 
  by 
  

   Dr. 
  Harlan 
  in 
  1835, 
  from 
  specimens 
  sent 
  him 
  by 
  Judge 
  

   Bry, 
  from 
  the 
  Washitta, 
  in 
  Louisiana. 
  

  

  Similar 
  remains 
  were 
  subsequently 
  discovered 
  in 
  

   Arkansas, 
  and 
  much 
  more 
  abundantly 
  in 
  Clark 
  County, 
  

   Alabama, 
  than 
  elsewhere. 
  

  

  A 
  skeleton, 
  ma,de 
  up 
  from 
  portions 
  obtained 
  in 
  differ- 
  

   ent 
  localities 
  in 
  Alabama, 
  was 
  taken 
  to 
  Europe 
  for 
  exhi- 
  

   bition 
  under 
  the 
  name 
  of 
  " 
  Hydrarchos 
  Sillimani" 
  — 
  a 
  

   representation 
  of 
  which, 
  after 
  being 
  reconstructed 
  on 
  

   anatomical 
  principles, 
  may 
  be 
  seen 
  in 
  the 
  IconograpMc 
  

   Encydopccdia, 
  being 
  the 
  central 
  figure 
  on 
  Plate 
  39. 
  

   The 
  peculiar 
  and 
  characteristic 
  teeth 
  are 
  also 
  shown 
  on 
  

   the 
  same 
  Plate, 
  figures 
  60 
  and 
  61. 
  

  

  Subsequently, 
  when 
  it 
  was 
  ascertained 
  to 
  be 
  more 
  

   nearly 
  allied 
  to 
  the 
  cetacean 
  than 
  to 
  the 
  reptilian 
  order 
  

   of 
  animals, 
  Dr. 
  Owen, 
  the 
  distinguished 
  comparative 
  

   anatomist 
  of 
  Great 
  Britain, 
  proposed 
  the 
  name 
  of 
  

  

  