﻿844 
  Forty- 
  seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

   Cyrtia 
  radians, 
  sp. 
  nov. 
  

  

  (Plates 
  xxxviii, 
  figs. 
  4, 
  5, 
  50, 
  52; 
  xxxix, 
  fig. 
  33.) 
  

  

  The 
  typical 
  form 
  is 
  of 
  medium 
  size, 
  with 
  high 
  area 
  incurved, 
  

   umbo 
  and 
  general 
  cyrtiniform 
  aspect. 
  Its 
  outer 
  surface 
  is 
  char- 
  

   acterized 
  by 
  an 
  absence 
  of 
  plications 
  and 
  fine 
  radial 
  striae. 
  

   Median 
  fold 
  and 
  sinus 
  well 
  developed. 
  

  

  Clinton 
  group. 
  Rochester, 
  J¥. 
  Y. 
  

  

  An 
  allied 
  but 
  larger 
  form, 
  here 
  referred 
  to 
  this 
  species, 
  occurs 
  

   in 
  the 
  Niagara 
  dolomites, 
  near 
  Milwaukee, 
  Wis. 
  

  

  Cyrtina 
  umbonata, 
  Hall, 
  var. 
  Alpenensis, 
  var. 
  nov. 
  

   (Plate 
  xxviii, 
  figs. 
  16-20.) 
  

   Cyrtina 
  umbonata, 
  Hall, 
  from 
  the 
  original 
  locality 
  in 
  Iowa, 
  is 
  

   a 
  small 
  shell, 
  often 
  obscurelv 
  plicated 
  ; 
  this 
  variety 
  possesses 
  the 
  

   contour 
  of 
  C. 
  umbonata, 
  but 
  is 
  a 
  larger 
  and 
  more 
  robust 
  shell 
  

   with 
  broad 
  and 
  well-defined 
  plications, 
  smooth 
  median 
  fold 
  and 
  

   sinus. 
  

  

  Hamilton 
  group. 
  Alpena, 
  Michigan. 
  

  

  Cyrtina 
  lachrymosa, 
  sp. 
  nov. 
  

   (Plate 
  xxviii, 
  figs. 
  36, 
  37, 
  47.) 
  

   Shells 
  small 
  ; 
  cardinal 
  area 
  high, 
  more 
  or 
  less 
  incurved. 
  Sur- 
  

   face 
  with 
  low 
  and 
  rather 
  narrow 
  median 
  fold 
  and 
  sinus 
  on 
  each 
  

   side 
  of 
  which 
  are 
  two 
  or 
  three 
  low, 
  faint 
  plications. 
  Lateral 
  mar- 
  

   gins 
  of 
  the 
  cardinal 
  area 
  broadly 
  rounded. 
  Surface 
  covered 
  with 
  

   elongate 
  pustules, 
  some 
  coarse, 
  but 
  the 
  greater 
  number 
  quite 
  fine. 
  

   Height 
  of 
  an 
  average 
  specimen, 
  5 
  mm.; 
  width 
  and 
  length, 
  6 
  mm 
  # 
  

   Waverly 
  group. 
  Richfield, 
  Ohio. 
  

  

  Syringothyris 
  Missouri, 
  sp. 
  nov. 
  

   (Plate 
  xxxix, 
  figs. 
  29-31.) 
  

  

  Shell 
  small, 
  cyrtiniform 
  ; 
  cardinal 
  area 
  high, 
  slightly 
  incurved 
  

   toward 
  the 
  apex; 
  lateral 
  cardinal 
  margin 
  broadly 
  rounded, 
  

   rendering 
  the 
  definition 
  of 
  the 
  area 
  quite 
  obscure. 
  Median 
  fold 
  

   and 
  sinus 
  neither 
  wide 
  nor 
  highly 
  developed. 
  Surface 
  of 
  both 
  

   smooth. 
  Each 
  lateral 
  slope 
  with 
  five 
  or 
  six 
  low 
  plications. 
  

  

  Interiorly 
  the 
  pedicle-valve 
  bears 
  strong 
  divergent 
  dental 
  

   lamellae 
  which 
  are 
  attached 
  to 
  the 
  surface 
  of 
  the 
  valve 
  for 
  fully 
  

   one-third 
  its 
  length. 
  There 
  is 
  no 
  median 
  septum. 
  The 
  trans- 
  

  

  