﻿ART. 
  25 
  GENERA 
  SIPHOGENERINA 
  AND 
  PAVONINA 
  CUSHMAN 
  9 
  

  

  1,618 
  fathoms, 
  and 
  from 
  nine 
  stations 
  in 
  the 
  Philippine 
  region, 
  rang- 
  

   ing 
  in 
  depths 
  from 
  78 
  to 
  554 
  fathoms. 
  

  

  Heron-Allen 
  and 
  Earland 
  record 
  the 
  species 
  from 
  the 
  Kerimba 
  

   Archipelago 
  10 
  as 
  follows: 
  

  

  At 
  Stn. 
  10 
  the 
  specimens 
  are 
  of 
  a 
  regular 
  type, 
  cylindrical 
  in 
  section, 
  similar 
  to 
  

   Brady's 
  figures. 
  At 
  Stn. 
  1 
  1 
  the 
  specimens 
  are 
  large, 
  oval 
  in 
  section, 
  and 
  character- 
  

   ized 
  by 
  a 
  bifarine 
  arrangement 
  of 
  the 
  middle 
  chambers, 
  the 
  septa, 
  which 
  are 
  

   limbate, 
  running 
  in 
  a 
  zigzag 
  direction. 
  The 
  shells 
  thus 
  appear 
  to 
  present 
  a 
  

   transition 
  type 
  between 
  S. 
  striata 
  and 
  S. 
  bifrons 
  Brady. 
  

  

  The 
  figured 
  specimens 
  from 
  the 
  Kerimba 
  region 
  show 
  specimens 
  

   which 
  seem 
  to 
  belong 
  to 
  Bolivina 
  or 
  Bifarina 
  and 
  not 
  to 
  Siphogen- 
  

   erina, 
  nor 
  do 
  they 
  suggest 
  S. 
  bifrons, 
  which 
  is 
  a 
  very 
  well 
  character- 
  

   ized 
  species, 
  even 
  though 
  it 
  has 
  a 
  striate 
  variety. 
  The 
  ornamenta- 
  

   tion 
  of 
  the 
  figured 
  specimens 
  suggests 
  Bolivina 
  rather 
  than 
  Siphogen- 
  

   erina. 
  

  

  SIPHOGENERINA 
  IRREGULARIS 
  (Bagg) 
  

  

  Plate 
  1, 
  figs. 
  11, 
  12 
  

  

  Sagrina 
  irregularis 
  Bagg, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  34, 
  1908, 
  p. 
  152, 
  pi. 
  5, 
  

  

  figs. 
  8-10. 
  

   Siphogenerina 
  irregularis 
  Cushman, 
  Bull. 
  71, 
  U. 
  S. 
  Nat. 
  Mus., 
  pt. 
  3, 
  1913, 
  

  

  p. 
  109, 
  pi. 
  47, 
  figs. 
  6, 
  7. 
  

  

  Description. 
  — 
  Test 
  elongate, 
  subcylindrical; 
  chambers 
  somewhat 
  

   irregular, 
  but 
  becoming 
  uniserial 
  in 
  the 
  last-formed 
  portion; 
  sutures 
  

   distinct, 
  depressed; 
  wall 
  thin, 
  translucent, 
  surface 
  with 
  numerous, 
  

   slightly 
  raised, 
  longitudinal 
  costae; 
  apertural 
  end 
  of 
  the 
  chamber 
  

   depressed, 
  the 
  aperture 
  with 
  a 
  long 
  slender 
  cylindrical 
  neck 
  and 
  

   slightly 
  flaring 
  lip. 
  

  

  Length, 
  0.75-1.50 
  mm. 
  

  

  Distribution. 
  — 
  Nothing 
  is 
  known 
  of 
  this 
  species 
  outside 
  the 
  region 
  

   of 
  the 
  Hawaiian 
  Islands. 
  Bagg 
  originally 
  described 
  it 
  from 
  Albatross 
  

   collections 
  off 
  the 
  Hawaiian 
  Islands 
  in 
  275-384 
  fathoms. 
  I 
  later 
  had 
  

   it 
  from 
  Albatross 
  and 
  Nero 
  stations 
  in 
  the 
  same 
  region, 
  in 
  268-392 
  

   fathoms. 
  

  

  The 
  distinguishing 
  characters 
  of 
  the 
  species 
  are 
  the 
  thin 
  wall, 
  

   numerous 
  longitudinal 
  costae, 
  and 
  especially 
  the 
  peculiar 
  way 
  in 
  

   which 
  the 
  apertural 
  neck 
  is 
  set 
  down 
  into 
  a 
  depression 
  of 
  the 
  last- 
  

   formed 
  chamber. 
  

  

  Young 
  specimens 
  which 
  have 
  not 
  yet 
  developed 
  the 
  uniserial 
  char- 
  

   acter 
  very 
  strongly 
  resemble 
  Uvigerina 
  nitidula 
  Schwager. 
  11 
  I 
  have 
  

   recorded 
  it 
  from 
  the 
  Lower 
  Oligocene 
  (Prof. 
  Pap. 
  133, 
  U. 
  S. 
  Geol. 
  

   Surv., 
  1923, 
  p. 
  35) 
  but 
  these 
  specimens 
  probably 
  belong 
  elsewhere. 
  

  

  io 
  Trans. 
  Zool. 
  8oc. 
  London, 
  vol. 
  20, 
  1915, 
  p. 
  677. 
  

  

  » 
  Novara-Exped., 
  Qeol. 
  Theil., 
  vol. 
  2, 
  1867, 
  pi. 
  7, 
  flg. 
  S3. 
  

  

  53650— 
  26f 
  2 
  

  

  