Yol.  49.] 
OSTRACODA  FROM  WESTMORELAND. 
291 
§  5.  Description  of  the  Species  and  Varieties. 
I.  Genus  Primitia,  Jones  &  Holl,  1865. 
1.  Primitia  centralis,  Ulrich.  (PI.  XII.  figs.  1  a ,  b ,  c.) 
Size. — Length  *64  millim.,  height  *36  millim.,  thickness  •2millime> 
This  neat  little  ovate-oblong  Primitia ,  from  Pusgill,  is  gently 
and  evenly  convex,  with  a  faint  central  pit  and  a  punctate  surface. 
It  resembles  the  narrow  variety  of  Ulrich’s  P.  centralis  (Journ. 
Cincinn.  Soc.  Nat.  Hist.  vol.  xiii.  pt.  i.  1890,  p.  130,  pi.  x.  fig.  2) 
more  nearly  than  any  other  published  form.  The  American  speci¬ 
mens  are  from  the  Utica  Shales  in  the  Ohio  River,  near  Cincinnati. 
Locality. — “  Pusgill.” 
2.  Primitia  mtjndtjla,1  Jones.  (PI.  XII.  figs.  2  &  3.) 
[See  Ann.  Mag.  Nat.  Hist.  ser.  6,  vol.  iii.  1889,  pp.  373-383, 
pi.  xvi.,  for  synonyms  and  varieties.] 
Size. — Pig.  2 :  Length  *72  millim.,  height  *48  millim. 
Pig.  3:  Length  *64  millim.,  height  *52  millim. 
These  subquadrate  casts,  one  of  which  (fig.  3)  is  obliquely  dis¬ 
torted,  have  resemblances  to  some  published  forms,  especially  fig.  5 
of  pi.  xvi.  referred  to  above,  but  have  a  rather  stronger  sulcus.  They 
are  proportionally  shorter  than  Primitia  Barrcindiana ,2  Jones,  and 
they  have  too  straight  a  hinge-line  for  P.  pusilla,3  Jones  and  Holl. 
They  are  somewhat  like  P.  (Halliella)  seminulum ,4  Jones,  especially 
in  the  strong  furrow,  but  they  want  the  ornament  and  border.  The 
most  approximate  form  is  shown  by  Krause’s  illustration  of  P. 
munclula .’ 
This  species  has  a  long  range  in  time  and  a  wide  distribution. 
Localities. — Pig.  2  :  “  Pusgill.”  Pig.  3  :  In  a  greenish-grey  schis¬ 
tose  mudstone,  from  the  StauroceplialusAimestorie  at  Billy  Beck. 
3.  Primitia  mundula,  Jones,  var.  longa,  nov.  (PI.  XII.  figs.  4  «,  b.) 
Size. — Length  1  millim.,  height  '52  millim.,  thickness  *32  millim. 
This  differs  from  the  foregoing  (fig.  3)  only  by  its  greater  length 
and  sub-oblong  outline. 
Locality. — “  Pusgill.” 
4.  Primitia  mundijla,  Jones,  var.  producta,  nov.  (PI.  XII. 
figs.  5  a,  b,  '&  6  a,  b.) 
Size. — Pig.  5  :  Length  1*68  millim.,  height  *64  millim.,  thickness 
*48  millim. 
Pig.  6  :  Length  le16  millim.,  height  *52  millim.,  thickness 
*4  millim. 
1  There  are  some  curious  imitations  of  suboval  Primitice,  with  the  dorsal 
notch  varying  in  size  and  position,  among  Barrande’s  figures  of  Piscina  dubia 
in  his  ‘  Syst.  Silur.  Boheme,’  vol.  v.  pi.  xcviii.  divn.  iii.  figs.  3,  5,  6. 
2  ‘Monogr.  Grirvan  Fossils,’  vol.  i.  1880,  p.  220,  pi.  xv.  figs.  11  b  &  11  f. 
3  Ann.  Mag.  Nat.  Hist.  ser.  3,  vol.  xvi.  1865,  p.  424,  pi.  xiii.  fig.  11. 
4  Ibid.  ser.  2,  vol.  xvi.  1855,  p.  173,  pi.  vi.  fig.  24,  et  ppstea.  Beferred 
provisionally  to  Halliella  by  Ulrich,  1891. 
5  Zeitschr.  Deutsch.  geol.  Gesellsch.  vol.  xliii.  1891,  p.  495,  pi.  xxx.  fig.  5. 
