﻿338 
  v 
  Scientific 
  Intelligence. 
  

  

  terina, 
  Klasmura, 
  and 
  Argentinaster; 
  Serpulites 
  is 
  shown 
  to 
  be 
  

   related 
  to 
  Conularia 
  and 
  both, 
  along 
  with 
  /Sphenothallus, 
  Knchos- 
  

   toma 
  and 
  Torrellella, 
  are 
  thought 
  to 
  be 
  tube-inhabiting 
  anne- 
  

   lids 
  ; 
  Spathiocaris 
  and 
  the 
  Discinocarina 
  are 
  probably 
  aptychi 
  ; 
  the 
  

   new 
  species, 
  Pseudoniscus 
  clarkei, 
  is 
  described 
  ; 
  there 
  is 
  a 
  note 
  

   on 
  the 
  habitat 
  of 
  eurypterids 
  and 
  a 
  very 
  valuable 
  description 
  of 
  

   median 
  eyes 
  in 
  trilobites 
  ; 
  and 
  finally 
  we 
  learn 
  that 
  Trinucleus 
  

   has 
  free 
  cheeks 
  and 
  is 
  therefore 
  an 
  opisthoparian. 
  c. 
  s. 
  

  

  8. 
  The 
  Great 
  Eruption 
  of 
  Sakura-jima 
  in 
  1914 
  / 
  by 
  B. 
  Koto. 
  

   Jour. 
  Coll. 
  Sci. 
  Imp. 
  Univ. 
  Tokyo, 
  vol. 
  xxxviii, 
  1916. 
  Art. 
  3, 
  

   pp. 
  1-237, 
  pis. 
  i- 
  xxiii, 
  and 
  map. 
  — 
  This 
  account 
  gives 
  an 
  excellent 
  

   description 
  of 
  this 
  great 
  eruption, 
  which 
  was 
  unusual, 
  not 
  only 
  

   by 
  reason 
  of 
  its 
  magnitude, 
  but 
  from 
  the 
  lateral 
  eruptions 
  accom- 
  

   panying 
  it, 
  which 
  poured 
  large 
  volumes 
  of 
  lava 
  into 
  the 
  sea. 
  

   The 
  various 
  stages 
  of 
  the 
  eruption 
  and 
  its 
  features 
  are 
  pictured 
  

   with 
  considerable 
  detail 
  and 
  illustrated 
  by 
  many 
  fine 
  half-tone 
  

   plates 
  and 
  figures 
  in 
  the 
  text. 
  Professor 
  Koto 
  believes 
  that 
  the 
  

   disturbance 
  was 
  a 
  normal 
  one 
  for 
  the 
  volcano 
  according 
  to 
  the 
  

   periodic 
  recurrence 
  of 
  activity 
  in 
  Japanese 
  volcanoes 
  of 
  about 
  

   120-130 
  years 
  ; 
  following 
  Jensen, 
  he 
  thinks 
  individual 
  volcanoes, 
  

   like 
  Asama, 
  may 
  have 
  a 
  60-year 
  period, 
  but 
  that 
  the 
  regional 
  

   activity 
  of 
  deep 
  origin 
  revives 
  after 
  the 
  double 
  length 
  of 
  the 
  

   60-year 
  cycle, 
  and 
  quotes 
  cases 
  to 
  illustrate 
  this. 
  The 
  bilateral 
  

   eruptions 
  he 
  suggests 
  may 
  have 
  been 
  caused 
  by 
  horizontal 
  ejec- 
  

   tions 
  of 
  considerable 
  magnitude 
  into 
  the 
  flanks 
  of 
  the 
  volcano, 
  

   and 
  that 
  relief 
  from 
  pressure 
  in 
  these 
  satellitic 
  injection 
  cham- 
  

   bers 
  took 
  place 
  directly 
  upward, 
  giving 
  rise 
  to 
  subordinate 
  vents. 
  

  

  The 
  petrography 
  of 
  the 
  ejected 
  material 
  is 
  fully 
  given, 
  with 
  a 
  

   number 
  of 
  chemical 
  analyses. 
  

  

  The 
  work 
  is 
  an 
  important 
  contribution 
  to 
  vulcanology, 
  

   especially 
  in 
  respect 
  to 
  the 
  manifestations 
  of 
  volcanic 
  phe- 
  

   nomena 
  in 
  the 
  Japanese 
  islands. 
  l. 
  v. 
  p. 
  

  

  9. 
  On 
  Synantectic 
  Minerals 
  and 
  Related 
  Phenomena; 
  by 
  

   J. 
  J. 
  Sederholm. 
  Bull, 
  de 
  la 
  Comm. 
  Geol. 
  de 
  Finlande, 
  No. 
  

   48. 
  Pp. 
  148, 
  pis. 
  viii, 
  1916. 
  — 
  This 
  work 
  deals 
  with 
  certain 
  min- 
  

   eral 
  structures 
  found 
  in 
  igneous 
  and 
  other 
  rocks, 
  known 
  as 
  reac- 
  

   tion 
  rims, 
  corona 
  minerals, 
  kelyphite, 
  myrmekite, 
  etc. 
  It 
  may 
  be 
  

   recalled 
  that 
  in 
  1897 
  in 
  certain 
  rocks 
  in 
  Finland 
  the 
  author 
  pro- 
  

   posed 
  the 
  name 
  of 
  myrmekite 
  for 
  certain 
  micropegmatitic 
  inter- 
  

   growths, 
  which, 
  however, 
  were 
  not 
  composed 
  of 
  orthoclase 
  and 
  

   quartz, 
  but 
  of 
  plagioclase 
  and 
  quartz 
  ; 
  this 
  occurs 
  as 
  masses 
  with 
  

   convex 
  outline 
  projecting 
  into 
  potash 
  feldspar. 
  The 
  study 
  of 
  

   this 
  has 
  led 
  him 
  to 
  consider 
  other 
  cases, 
  where 
  it 
  is 
  characteristic 
  

   of 
  certain 
  mineral 
  groupings 
  in 
  igneous 
  rocks, 
  that 
  they 
  occur 
  

   only 
  where 
  two 
  definite 
  minerals 
  meet. 
  The 
  coronas 
  around 
  

   olivine 
  in 
  gabbros 
  are 
  an 
  example. 
  Minerals 
  in 
  such 
  associations 
  

   he 
  designates 
  as 
  synantectic 
  (from 
  the 
  Greek, 
  meaning 
  to 
  meet). 
  

   They 
  are 
  found 
  in 
  a 
  great 
  variety 
  of 
  rocks, 
  and 
  some 
  penologists 
  

   have 
  been 
  inclined 
  to 
  consider 
  them 
  as 
  a 
  structure 
  produced 
  in 
  

   the 
  original 
  consolidation 
  of 
  the 
  magma, 
  whereas 
  others 
  have 
  

  

  