﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  573 
  

  

  behind 
  the 
  beak; 
  both 
  connected 
  ventrally 
  from 
  the 
  beak 
  by 
  a 
  

   slight 
  impression, 
  causing 
  the 
  beak 
  to 
  project 
  more 
  strongly 
  in 
  

   casts. 
  

  

  Muscle 
  impressions 
  and 
  the 
  character 
  of 
  the 
  hinge 
  have 
  not 
  

   been 
  observed. 
  

  

  Dimensions. 
  Largest 
  specimen 
  : 
  length 
  12.3 
  mm, 
  night 
  6.6 
  mm, 
  

   thickness 
  1.8 
  mm; 
  another 
  specimen 
  measured 
  respectively 
  

   8x5x1.5 
  m; 
  another 
  9x5.3x1 
  mm; 
  a 
  fourth 
  8.6x5.5x2 
  mm. 
  

  

  This 
  form, 
  which 
  belongs 
  to 
  the 
  peculiar 
  and 
  not 
  yet 
  fully 
  

   understood 
  Siluric 
  group 
  of 
  lamellibranchs, 
  for 
  which 
  S. 
  A. 
  Miller 
  

   (NortJi 
  American 
  geology 
  and 
  paleontology, 
  1889. 
  p. 
  514) 
  introduced 
  

   the 
  generic 
  name 
  Technophorus, 
  and 
  of 
  which 
  E. 
  O. 
  

   Ulrich 
  described 
  several 
  species, 
  has 
  its 
  nearest 
  relative 
  in 
  

   Technophorus 
  subacutus, 
  Ulrich 
  from 
  the 
  upper 
  part 
  

   of 
  the 
  Trenton 
  limestone 
  of 
  Minnesota, 
  which, 
  however, 
  is 
  known 
  

   only 
  in 
  casts 
  ; 
  the 
  casts 
  of 
  the 
  two 
  species 
  differ 
  materially 
  in 
  the 
  

   charater 
  of 
  the 
  beaks, 
  in 
  the 
  cardinal 
  and 
  general 
  outline. 
  Our 
  

   species 
  differs 
  from 
  all 
  other 
  congeneric 
  forms 
  whose 
  surface 
  

   sculpture 
  is 
  known, 
  by 
  its 
  cancellate 
  surface. 
  

  

  Upper 
  Utica 
  sihales 
  of 
  northern 
  Green 
  Island, 
  Albany 
  co. 
  N. 
  Y. 
  

  

  § 
  3 
  ANNELIDA 
  

  

  Certain 
  layers 
  of 
  the 
  Utica 
  graptolite 
  shales 
  of 
  the 
  Rural 
  ceme- 
  

   tery 
  near 
  Albany 
  are 
  profusely 
  covered 
  with 
  worm-shaped 
  car- 
  

   bonaceous 
  films. 
  The 
  actual 
  presence 
  of 
  organic 
  matter, 
  the 
  

   uniform 
  dimensions 
  of 
  certain 
  types 
  and 
  the 
  distinct 
  terminations 
  

   of 
  the 
  fossils 
  leave 
  no 
  doubt 
  that 
  they 
  represent 
  not 
  mere 
  tracks 
  

   but 
  actual 
  bodies 
  of 
  animals. 
  Two 
  types 
  could 
  be 
  made 
  out 
  of 
  

   sufficient 
  perfection 
  to 
  warrant 
  their 
  being 
  named 
  and 
  described. 
  

  

  Eopolychaetus 
  albaniensis 
  gen. 
  nov. 
  et 
  spec. 
  nov. 
  

   (see 
  pi. 
  1, 
  fig. 
  13) 
  

  

  Head 
  distinctly 
  separate 
  from 
  the 
  body, 
  semicircular, 
  with 
  a 
  

   median 
  oval 
  depression 
  which 
  extends 
  a 
  little 
  on 
  the 
  first 
  body 
  

   segment. 
  

  

  