Yol.  49.] 
FANNY  BAY,  POET  DARWIN,  AUSTRALIA. 
225 
Lithoccimjpe  fusifonnis,  n.  sp.  (PL  Y.  fig.  16.) 
Test  elongate,  fusiform,  increasing  in  breadth  to  nearly  the  last 
partition,  then  contracted.  There  are  four  nearly  horizontal,  trans¬ 
verse  partitions  ;  the  terminal  aperture  is  narrow  and  apparently 
retracted,  hut  not  closed  by  a  perforate  plate.  Length,  ’335  mm. ; 
greatest  breadth,  *10  mm.  Rare. 
Stichocajgsa  jyinguis ,  n.  sp.  (PI.  Y.  fig.  17.) 
Test  subcylindrical,  with  five  partitions,  the  first  two  segments 
small,  the  next  three  rounded  and  subequal ;  traces  of  a  perforate 
plate  below  the  last  segment.  Pores  not  shown.  Length,  -165  mm. ; 
greatest  breadth,  *075  mm.  Rare. 
S Hichocapsa  chrysalis ,  n.  sp.  (PI.  Y.  fig.  18.) 
Test  spindle-shaped,  with  four  segments  ;  the  partitions  are  nearly 
straight;  the  fourth  segment  is  the  largest,  and  below  this  a  perforate 
plate  is  faintly  shown.  Length,  *11  mm. ;  greatest  breadth,  ’055  mm. 
Rare. 
EXPLANATION  OF  PLATE  Y. 
Fig.  1.  Cenellvjpsis,  sp.  x  260. 
'  Fig.  2.  Spongodiscus,  sp.  X  200, 
Fig.  3.  Astrophacus,  sp.  b.  X  200. 
Figs.  4,  5.  Astrophacus,  sp.  a.  X  200. 
Fig.  6.  Spongodiscus  expansus ,  n.  sp.  X  200. 
Fig.  7.  Spongodiscus,  sp.  X  200. 
Fig.  8.  Lithocyclia  exilis,  n.  sp.  X  200. 
Fig.  9.  Amphibrachiwn  crassum,  n.  sp.  x  200. 
Fig.  10.  A mpJiibrachium  truncatum,  n.  sp.  X  200. 
Fig.  11.  Amphibrachium  fragile,  n.  sp.  X  200. 
Fig.  12.  Spongolena  symmetrica,  n.  sp.  X  200. 
Fig.  13.  Amphibrachium,  sp.  X  200. 
Fig.  14.  Dictyomitra  australis,  n.  sp.  X  200. 
Fig.  15.  Dictyomitra  triangularis,  n.  sp.  X  2CQ. 
Fig.  16.  Lithocampe  fusifonnis,  n.  sp.  X  200. 
Fig.  17.  Stichocapsa  pinguis,  n.  sp.  X  200. 
Fig.  18.  Stichocapsa  chrysalis,  n.  sp.  X  200. 
All  the  specimens  are  from  the  white  rock  in  the  cliff,  at  Fanny  Eay,  Port 
Darwin,  Australia. 
[ Note . — After  the  paper  had  been  set  up  in  type  I  received  a 
letter  from  P.  W.  Eassett-Smith,  Esq.,  Surgeon  R.N.,  of  H.M.S. 
‘  Penguin,5  who  assisted  in  obtaining  the  radiolarian  rock  from  Port 
Darwin,  giving  the  required  information  as  to  the  occurrence 
of  the  deposit  in  this  locality.  Mr.  Eassett-Smith  states  that  the 
white  radiolarian  rock  forms  a  very  prominent  feature  in  the  steep 
cliffs,  from  30  to  50  feet  in  height,  which  border  the  harbour  of 
Port  Darwin.  The  rock  is  exposed  for  many  miles  on  the  Fanny 
Eay  side  of  the  harbour,  and  extends  continuously  on  the  beach 
from  point  to  point  across  the  bay.  A  section  in  the  cliff  at 
Fanny  Eay  consists  at  the  base  of  mica- schists  and  quartz,  on  which 
discordantly  rests  a  narrow  band  of  soft  ochre-like  clay,  followed 
Q,.  J.  Gr.  S.  No.  194.  q 
