﻿506 
  A. 
  W. 
  WATEKS 
  ON 
  CHILOSTOMATOUS 
  BRYOZOA 
  

  

  9. 
  Steganoporella 
  magnilabris, 
  Busk. 
  Plate 
  XXII. 
  figs. 
  7, 
  7a. 
  

  

  Lepraliafirma, 
  Reuss, 
  "Die 
  foss. 
  Anth.d. 
  Schichtenvon 
  Castelgom- 
  

   berto,'' 
  Denkschr. 
  Ak. 
  Wien, 
  vol. 
  xxviii. 
  p. 
  52, 
  pi. 
  xv. 
  fig. 
  11. 
  

  

  Membranipora 
  magnilabris, 
  Busk, 
  Mar. 
  Poly. 
  p. 
  62, 
  pi. 
  lxv. 
  fig. 
  4. 
  

  

  Steganoporella 
  elegans, 
  Smitt 
  (d'Orb.?), 
  Floridan 
  Bry. 
  pt. 
  ii. 
  p. 
  15, 
  

   pi. 
  iv. 
  figs. 
  96-101. 
  

  

  Biflustra 
  crassa, 
  Haswell, 
  "On 
  some 
  Polyzoa 
  from 
  the 
  Queens- 
  

   land 
  Coast," 
  Proc. 
  Linn. 
  Soc. 
  X. 
  S. 
  Wales, 
  vol. 
  v. 
  pt. 
  1, 
  p. 
  38, 
  pi. 
  i. 
  

   fig. 
  8. 
  

  

  Vincularia 
  neozelanua, 
  Busk, 
  Q. 
  J. 
  M. 
  S. 
  new 
  ser. 
  vol. 
  i. 
  1861, 
  

   p. 
  155, 
  pi. 
  xxxiv. 
  figs. 
  5, 
  5a. 
  

  

  Steganoporella 
  magnilabris, 
  Hincks, 
  Anu. 
  & 
  Mag. 
  Nat. 
  Hist. 
  

   ser. 
  5, 
  vol. 
  viii. 
  p. 
  7. 
  

  

  Steganoporella 
  magnilabris, 
  MacGillivray, 
  Zool. 
  of 
  Victoria, 
  dec. 
  

   vi. 
  1881, 
  p. 
  43, 
  pi. 
  lx. 
  fig. 
  1. 
  

  

  The 
  Bairnsdale 
  specimens 
  are 
  in 
  the 
  Eschara 
  -form. 
  ; 
  the 
  badly 
  

   preserved 
  fragment 
  from 
  Mount 
  Gambier 
  is 
  apparently 
  in 
  the 
  Lepra- 
  

   lia-ioYva. 
  In 
  the 
  Bairnsdale 
  fossil 
  there 
  are 
  two 
  small 
  denticles 
  a 
  

   small 
  distance 
  down 
  the 
  oral 
  tube, 
  evidently 
  showing 
  the 
  position 
  of 
  

   the 
  diaphragm, 
  which 
  shuts 
  off 
  the 
  lower 
  portion 
  of 
  the 
  cavity. 
  

  

  Mr. 
  Hincks, 
  in 
  a 
  valuable 
  description 
  of 
  Steganoporella 
  neozelanica, 
  

   Busk 
  (Ann. 
  & 
  Mag. 
  Xat. 
  Hist. 
  ser. 
  5, 
  vol. 
  ix. 
  Feb. 
  1882, 
  p. 
  119, 
  

   pi. 
  v. 
  fig. 
  9.), 
  points 
  out 
  the 
  resemblance 
  of 
  S. 
  magnilabris 
  and 
  S. 
  

   neozelanica 
  ; 
  but, 
  from 
  the 
  examination 
  of 
  specimens 
  in 
  my 
  collection, 
  

   I 
  am 
  quite 
  unable 
  to 
  understand 
  why 
  Mr. 
  Hincks 
  does 
  not 
  unite 
  

   them. 
  The 
  width 
  of 
  the 
  aperture 
  in 
  recent 
  and 
  fossil 
  specimens 
  is 
  

   about 
  0*38 
  millim. 
  Mr. 
  Hincks 
  calls 
  attention 
  to 
  this 
  species 
  having 
  

   being 
  found 
  with 
  various 
  habits 
  of 
  growth 
  in 
  Australia 
  ; 
  and 
  the 
  

   same 
  thing 
  is 
  the 
  case 
  in 
  Florida, 
  and 
  we 
  now 
  also 
  find 
  it 
  to 
  be 
  

   the 
  case 
  with 
  fossils. 
  I 
  do 
  not 
  change 
  the 
  name 
  to 
  S. 
  firma, 
  as 
  I 
  

   have 
  not 
  had 
  the 
  opportunity 
  of 
  examining 
  any 
  specimen 
  from 
  Mt. 
  

   Castelgomberto, 
  and 
  the 
  description 
  is 
  not 
  very 
  full. 
  

  

  The 
  lip 
  at 
  the 
  base 
  of 
  the 
  aperture 
  has 
  been 
  called 
  a 
  denticle 
  ; 
  

   but 
  it 
  seems 
  unadvisable 
  to 
  retain 
  this 
  designation, 
  as 
  the 
  term 
  is 
  so 
  

   frequently 
  used 
  for 
  much 
  smaller 
  structures 
  occurring 
  in 
  the 
  aperture 
  

   and 
  in 
  pores 
  &c. 
  of 
  the 
  Bryozoa. 
  

  

  Loc. 
  Fossil: 
  Miocene, 
  Castelgomberto 
  (as 
  L. 
  firvna), 
  Mouille 
  

   Mougnon 
  (Ste. 
  Croix, 
  Cant. 
  Yaud*), 
  Mt. 
  Gambier, 
  S.W. 
  Victoria. 
  

   Living: 
  Abrolhos 
  Islet 
  and 
  Algoa 
  Bay 
  (B.\ 
  as 
  8. 
  neozelanica, 
  B., 
  

   Florida, 
  15-37 
  fathoms 
  (Sm.), 
  Holborn 
  Island 
  {Haswell 
  and 
  my 
  

   coll.), 
  Bass's 
  Straits 
  (Hincks), 
  Queenscliff 
  (MacG.). 
  

  

  Mr. 
  Hincks 
  has 
  given 
  a 
  list 
  of 
  recent 
  8teganoporellce 
  and 
  Micro- 
  

   porce 
  ; 
  and 
  as 
  fossil 
  we 
  may 
  add 
  Membranipora 
  holostoma, 
  S. 
  Woods, 
  

  

  * 
  These 
  beds 
  are 
  called 
  Miocene 
  in 
  the 
  Swiss 
  maps 
  ; 
  but, 
  so 
  far 
  as 
  I 
  am 
  aware, 
  

   no 
  fossils 
  have 
  yet 
  been 
  described 
  from 
  them. 
  Besides 
  S. 
  magnilabris 
  (in 
  Eschara- 
  

   form), 
  there 
  is 
  a 
  somewhat 
  similar 
  Steganoporella, 
  but 
  with 
  much 
  smaller 
  cells 
  

   and 
  in 
  Vincularia-form 
  ; 
  also 
  Myriozoum 
  truncatum, 
  Pall., 
  Porella 
  (Eschara) 
  

   cervicomis, 
  M.-Ed. 
  (non 
  Busk), 
  a 
  Schizoporella 
  which 
  is 
  common 
  in 
  the 
  Pliocene 
  

   of 
  Italy, 
  and 
  which 
  may 
  be 
  Eschara 
  incrassata, 
  M.-Ed. 
  (non 
  Hincks), 
  and, 
  fur- 
  

   ther, 
  Echinocyamus 
  ptisillus. 
  From 
  these 
  few 
  fossils 
  the 
  age 
  might 
  be 
  Miocene 
  

   or 
  Pliocene. 
  These 
  beds 
  are 
  close 
  upon 
  4000 
  feet 
  above 
  the 
  sea-level. 
  

  

  