﻿214 
  Prof. 
  Carl 
  Chun 
  on 
  the 
  

  

  the 
  characteristic 
  engine-turned 
  pattern 
  to 
  which 
  I 
  have 
  

   alluded, 
  and 
  that 
  any 
  horizontal 
  section 
  through 
  any 
  part 
  of 
  

   this 
  crust 
  would 
  present 
  this 
  pattern. 
  But 
  this 
  is 
  not 
  the 
  

   case, 
  inasmuch 
  as 
  the 
  thinnest 
  horizontal 
  section 
  beyond 
  the 
  

   central 
  plane 
  shows 
  that 
  horizontally 
  these 
  compressed 
  cells 
  

   are 
  not 
  only 
  very 
  variable 
  in 
  size, 
  but 
  present 
  the 
  utmost 
  

   irregularity 
  in 
  outline 
  that 
  can 
  be 
  conceived, 
  so 
  that 
  it 
  be- 
  

   comes 
  impossible 
  to 
  trace 
  any 
  direct 
  communication 
  between 
  

   any 
  of 
  them 
  and 
  those 
  of 
  the 
  central 
  plane 
  respectively 
  ; 
  while 
  

   the 
  nearer 
  the 
  columns 
  approach 
  the 
  surface 
  the 
  more 
  these 
  

   cells 
  (although 
  they 
  intercommunicate 
  with 
  each 
  other 
  

   throughout 
  by 
  the 
  " 
  minute 
  tubuli 
  " 
  to 
  which 
  I 
  have 
  alluded) 
  

   become 
  approximated, 
  till 
  at 
  last, 
  in 
  the 
  Alabama 
  species, 
  

   they 
  are 
  covered 
  in 
  by 
  the 
  smooth 
  homogeneous 
  layer 
  of 
  

   shell-substance 
  also 
  above 
  mentioned. 
  Hence, 
  like 
  most 
  of 
  

   the 
  specimens 
  of 
  Orbitolites 
  marginalia, 
  the 
  only 
  means 
  of 
  

   communication 
  externally 
  in 
  Orbitolites 
  Mantettivr&s 
  through 
  

   the 
  apertures 
  in 
  the 
  margin, 
  the 
  " 
  central 
  plane." 
  

  

  That 
  varieties 
  of 
  the 
  kind 
  typified 
  by 
  Orbitolites 
  Mantelli 
  

   will 
  be 
  hereafter 
  found 
  I 
  have 
  no 
  doubt; 
  and 
  Giimbel 
  has 
  

   already 
  added 
  two 
  under 
  his 
  subgenus 
  "Lepidocyclina" 
  viz. 
  

   U 
  L. 
  dilatata" 
  and 
  "L. 
  burdigalensis 
  " 
  {op. 
  et 
  loc. 
  cit.). 
  

  

  But 
  that 
  " 
  Orbitolites 
  " 
  of 
  Lamarck 
  should 
  be 
  used 
  as 
  the 
  

   generic 
  name 
  for 
  the 
  type 
  of 
  Morton's 
  Nummulites 
  Man- 
  

   telli 
  of 
  the 
  Claiborne 
  beds 
  in 
  Alabama 
  (as 
  I 
  first 
  proposed) 
  

   instead 
  of 
  " 
  Lepidocyclina 
  " 
  seems 
  to 
  me, 
  on 
  the 
  grounds 
  

   that 
  I 
  have 
  stated, 
  to 
  be 
  most 
  desirable; 
  while 
  as 
  regards 
  

   priority 
  in 
  nomenclature 
  we 
  find 
  that 
  as 
  far 
  back 
  as 
  1 
  799 
  

   Faujas 
  de 
  Saint-Fond 
  (in 
  his 
  Nat. 
  Hist, 
  de 
  la 
  Montague 
  

   de 
  Saint 
  Pierre 
  de 
  Maestricht) 
  stated 
  in 
  explanation 
  of 
  his 
  

   " 
  fig. 
  4 
  " 
  respecting 
  Orbitoides 
  media, 
  d'Orb., 
  that 
  " 
  Cette 
  

   numismale 
  n'etant 
  pas 
  forme"e 
  par 
  des 
  cloisons 
  transversales, 
  

   rentrerait, 
  d'apres 
  Lamarck, 
  dans 
  scs 
  Orbitolites." 
  

  

  XXIII. 
  — 
  The 
  Siphonophora 
  of 
  the 
  Canary 
  Islands. 
  

   By 
  Prof. 
  Carl 
  Chun 
  *. 
  

  

  During 
  my 
  residence 
  in 
  Orotava 
  I 
  directed 
  my 
  attention 
  

   chiefly 
  to 
  the 
  study 
  of 
  the 
  Canarian 
  Siphonophora. 
  I 
  suc- 
  

   ceeded 
  in 
  discovering, 
  besides 
  the 
  Canarian 
  forms 
  described 
  

  

  * 
  Translated 
  from 
  the 
  ' 
  Sitzungsberichte 
  der 
  konigl. 
  preuss. 
  Akademie 
  

   der 
  Wissenschaf'ten,' 
  1888, 
  no. 
  xliv. 
  pp. 
  1 
  141-1 
  17:J. 
  This 
  is 
  the 
  first 
  sec- 
  

   tion 
  of 
  a 
  " 
  Report 
  upon 
  a 
  Journey 
  to 
  the 
  Canary 
  Islands 
  performed 
  in 
  

   the 
  winter 
  of 
  1887-88," 
  and 
  is 
  preceded 
  by 
  a 
  short 
  statement 
  of 
  the 
  cir- 
  

  

  