﻿214 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  reticulated 
  striae. 
  Near 
  the 
  apex 
  the 
  shell 
  is 
  furnished 
  with 
  a 
  trans- 
  

   verse 
  septum. 
  

  

  Conularia 
  niagarensis 
  Hall 
  (Fig. 
  145) 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:294, 
  

   pl- 
  65) 
  

  

  Distinguishing 
  characters. 
  Broad, 
  pyramidal, 
  tapering 
  abruptly; 
  

   deep 
  abrupt 
  channels 
  of 
  the 
  angles; 
  shallow, 
  scarcely 
  defined 
  de- 
  

   pression 
  of 
  centers 
  of 
  faces; 
  fine 
  and 
  closely 
  arranged 
  transverse 
  

   striae, 
  which 
  extend 
  from 
  the 
  angles 
  obliquely 
  to 
  the 
  center, 
  and 
  

  

  Fig. 
  145 
  Conularia 
  niagarensis 
  with 
  several 
  striae 
  enlarged 
  

  

  bend 
  more 
  abruptly 
  in 
  crossing 
  the 
  central 
  depression; 
  granulate 
  

   character 
  of 
  striae; 
  intermediate 
  spaces 
  with 
  longitudinal 
  striae. 
  

  

  Found 
  in 
  the 
  Rochester 
  shale 
  at 
  Lockport 
  (Hall). 
  Probably 
  

   occurs 
  also 
  at 
  Niagara. 
  

  

  Class 
  CEPHALOPODA 
  Cuvier 
  

  

  The 
  cephalopods 
  are 
  the 
  most 
  highly 
  developed 
  mollusks, 
  possess- 
  

   ing 
  a 
  distinct, 
  well 
  defined 
  head, 
  a 
  circle 
  of 
  eight 
  or 
  more 
  arms 
  sur- 
  

   rounding 
  the 
  mouth 
  and 
  generally 
  furnished 
  with 
  suckers 
  or 
  hooks, 
  

   a 
  funnel-like 
  hyponome, 
  or 
  swimming 
  organ, 
  and 
  a 
  highly 
  developed 
  

   nervous 
  system. 
  The 
  majority 
  of 
  modern 
  genera 
  are 
  naked, 
  or 
  with 
  

   only 
  a 
  rudimentary 
  internal 
  shell 
  (squids, 
  cuttlefish, 
  etc.). 
  N 
  a 
  u 
  t 
  i 
  - 
  

   1 
  u 
  s 
  is 
  the 
  only 
  modern 
  genus 
  with 
  a 
  typical 
  external 
  shell. 
  

  

  The 
  shells 
  of 
  cephalopods 
  are 
  chambered, 
  i. 
  e. 
  divided, 
  by 
  a 
  series 
  

   of 
  transverse 
  floors 
  or 
  septa, 
  into 
  air 
  chambers. 
  The 
  last 
  or 
  living 
  

  

  