﻿Geology 
  and 
  Mineralogy. 
  493 
  

  

  11. 
  The 
  Ordovician 
  and 
  Silurian 
  Brachiopoda 
  of 
  the 
  Girvan 
  

   District 
  ; 
  by 
  F. 
  R. 
  C. 
  Reed. 
  Trans. 
  Royal 
  Soc. 
  Edinburgh, 
  vol. 
  

   li, 
  Pt. 
  IV, 
  1917, 
  pp. 
  795-998, 
  pis. 
  1-24.— 
  In 
  this 
  good 
  and 
  up-to- 
  

   date 
  revision 
  of 
  the 
  brachiopods 
  of 
  the 
  Girvan 
  district 
  of 
  Scotland 
  

   230 
  species 
  and 
  varieties 
  are 
  treated, 
  and 
  of 
  these 
  70 
  are 
  new. 
  

   Of 
  new 
  genera 
  there 
  are 
  the 
  orthids 
  Schizophorella, 
  Nicolella, 
  

   and 
  Harknessella 
  ; 
  of 
  strophomenids 
  Playfairia; 
  of 
  pentamerids 
  

   Metacarnarella 
  ; 
  and 
  of 
  chonetids 
  Eochonetes. 
  

  

  Even 
  though 
  the 
  species 
  are 
  predominantly 
  peculiar 
  to 
  Girvan, 
  

   the 
  brachiopod 
  development 
  of 
  the 
  Stinchar 
  (has 
  60 
  forms) 
  and 
  

   Balclatchie 
  (70) 
  divisions 
  correlates 
  best 
  with 
  that 
  of 
  the 
  Mo- 
  

   hawkian 
  series 
  of 
  the 
  Appalachian 
  Mountains. 
  No 
  significant 
  

   forms, 
  however, 
  are 
  common 
  to 
  these 
  two 
  widely 
  separated 
  areas 
  

   and 
  entire 
  groups 
  of 
  shells 
  are 
  absent 
  in 
  America. 
  The 
  White- 
  

   house 
  (34) 
  and 
  Drummuck 
  (40) 
  divisions 
  correlate 
  with 
  the 
  Rich- 
  

   mondian 
  of 
  eastern 
  North 
  America, 
  and 
  this 
  is 
  best 
  seen 
  in 
  the 
  

   introduction 
  here 
  of 
  Bhipidomella, 
  Bilobites, 
  Schuchertella 
  ; 
  

   Eochonetes, 
  Triplecia 
  insularis, 
  Dayia. 
  and 
  Atrypa. 
  There 
  is 
  

   therefore 
  in 
  the 
  Girvan 
  area, 
  as 
  elsewhere 
  in 
  Europe, 
  a 
  great 
  break 
  

   between 
  the 
  Balclatchie 
  and 
  Whitehouse 
  formations. 
  

  

  The 
  Silurian 
  in 
  the 
  Mulloch 
  Hill 
  (29) 
  and 
  Saugh 
  Hill 
  (42) 
  

   divisions 
  appears 
  to 
  correlate 
  best 
  with 
  the 
  earliest 
  American 
  

   division, 
  the 
  Medina-Cataract 
  series. 
  On 
  the 
  other 
  hand, 
  these 
  two 
  

   Girvan 
  faunas 
  have 
  of 
  American 
  Clinton 
  forms 
  Stricklandinia 
  

   lens 
  and 
  lirata, 
  Streptis, 
  JRhynchotreta 
  cuneata, 
  Atrypa 
  reticularis, 
  

   Rhynchospira&nd 
  Eichioaldia. 
  The 
  highest 
  divisions, 
  Camregan 
  

   (27) 
  and 
  Penkill 
  (25), 
  appear 
  to 
  be 
  of 
  the 
  age 
  of 
  the 
  Clinton 
  because 
  

   of 
  the 
  presence 
  of 
  Coelospira 
  hemispheriea. 
  c. 
  s. 
  

  

  12. 
  Notes 
  on 
  Cincinnatian 
  Fossils; 
  by 
  Aug. 
  F. 
  Foerste. 
  

   Bull. 
  Sci. 
  Lab. 
  Denison 
  Univ., 
  vol. 
  xviii, 
  1916, 
  pp. 
  285-355, 
  pis. 
  

   1-7. 
  — 
  Here 
  are 
  described 
  and 
  illustrated 
  the 
  type 
  specimens 
  of 
  48 
  

   species, 
  of 
  which 
  4 
  are 
  new 
  to 
  paleontology. 
  Of 
  new 
  genera 
  there 
  

   are 
  Calicidospongia, 
  Cameyella 
  and 
  Isorophus 
  ; 
  the 
  first 
  is 
  a 
  

   sponge 
  and 
  the 
  others 
  are 
  agelacrinids. 
  c. 
  s. 
  

  

  13. 
  New 
  Mineral 
  Names; 
  by 
  W. 
  E. 
  Ford 
  (communicated 
  — 
  

   continued 
  from 
  vol. 
  xlii, 
  pp. 
  504-505, 
  December, 
  1916): 
  — 
  

  

  Craildallite. 
  G. 
  F. 
  Loughlin 
  and 
  W. 
  T. 
  Schaller, 
  this 
  Jour- 
  

   nal, 
  xliii, 
  69, 
  1917. 
  — 
  In 
  compact 
  to 
  cleavable 
  masses 
  without 
  dis- 
  

   tinct 
  crystal 
  outline. 
  Microscopically 
  fibrous. 
  Apparently 
  an 
  

   alteration 
  from 
  a 
  non-fibrous 
  mineral 
  similar 
  to 
  goyazite, 
  to 
  which 
  

   the 
  platy 
  structure 
  belonged. 
  Color 
  white 
  to 
  light 
  gray 
  with 
  

   shadings 
  into 
  yellow 
  or 
  brown. 
  Luster 
  dull 
  to 
  pearly. 
  Nearly 
  

   opaque 
  in 
  hand 
  specimen 
  but 
  transparent 
  in 
  small 
  fragments. 
  

   Refractive 
  .indices 
  1*585 
  to 
  1*595. 
  Birefringence 
  from 
  to 
  0*01. 
  

   B. 
  B. 
  decrepitates 
  somewhat, 
  exfoliates 
  slightly 
  and 
  fuses 
  to 
  a 
  

   white 
  enamel. 
  In 
  C. 
  T. 
  decrepitates 
  and 
  gives 
  water. 
  Sol. 
  in 
  

   acids. 
  Comp. 
  — 
  2Ca0.4Al 
  2 
  3 
  .2P 
  2 
  O 
  s 
  . 
  10H 
  2 
  O 
  (similar 
  to 
  gorceixite). 
  

   Found 
  at 
  the 
  Brooklyn 
  mine, 
  \\ 
  miles 
  east 
  of 
  Silver 
  City, 
  Utah, 
  

   associated 
  with 
  quartz, 
  barite 
  and 
  tenorite. 
  Named 
  after 
  Mr. 
  

   M. 
  L. 
  Crandall 
  of 
  Provo, 
  Utah. 
  

  

  