Vol.  49.]  FROM  THE  DISTRICT  OF  GIRVAN,  AYRSHIRE.  305 
satisfactory  enough  for  safe  definition.  It  may,  however,  he  a 
broadty-margined  Sulcuna ;  and  fig.  10  may  once  have  been  margined. 
Fig.  10  is  in  no.  116,  and  fig.  11  in  no.  115,  both  grey  shale. 
These  occurrences  of  an  Upper-Palaeozoic  genus  in  Lower- 
Palaeozoic  strata  are  of  sufficient  interest  to  lead  us  to  make  the  most 
we  can  of  the  evidences  before  us. 
There  seems  to  be  some  approach  to  the  characteristic  notch  of 
Sulcuna  in  Primitia  Ulrichiana ,  PI.  XIV.  fig.  1. 
VI.  Genus  Cypridina,1  Milne  Edwards,  1837. 
1.  Cypridina  Grayh:,  sp.  nov.  (PI.  XIV.  fig.  12.) 
Size. — Length  1*08,  height  *76  millim. 
The  specimen  here  shown  is  a  rough  cast,  evidently  of  such  a 
Cypridina  as  is  often  found  fossil  and  known  under  this  general 
term,  for  want  of  knowledge  of  the  differential  soft  parts  of  the 
animals.  The  shape  of  the  valve  is  nearly  that  of  C.  Youngiana , 
Jones  &  Eirkby,2  though  boldly  rounded  in  the  front  moiety. 
This  affords  another  example  (besides  the  Sulcunce )  of  the  pre- 
currence  of  Carboniferous  forms  in  the  Lower-Silurian  strata  ;  and 
we  may  well  name  it  after  its  discoverer,  Mrs.  Gray. 
It  occurs  in  no.  118,  grey  shale. 
Another  Silurian  Cypridina  ( C .  Raisinice)  has  of  late  been  dis¬ 
covered  by  Miss  Daisin  in  Xorth  Wales  (see  Quart.  Journ.  Geol.  Soc. 
vol.  xlix.  1893,  p.  164) ;  and  another  Lower-Palseozoic  Cypridina 
had  been  figured  and  described  in  the  Geol.  Mag.  dec.  2,  vol.  viii. 
1881,  pp.  337,  347,  pi.  ix.  fig.  7. 
§  3.  List  of  the  Fossil  Entohostraca  froh  the  Girvan  District. 
(a)  Species  mentioned  in  the  4  Monograph  of  the  Silurian  Fossils 
of  the  Girvan  District  in  Ayrshire/  vol.  i.  1878-80. 
P.  227.  Penkill.  Deferred  to  the  low7er  part  of  the  Upper  Silurian, 
or  the  Upper-Llandovery  Beds,  or  Mayhill  Sandstone. 
1.  44  Peltocaris  ?  ”  (p.  212)  ;  this  is  a  Dipterocaris,  a  genus  rare 
in  Britain,  but  well  known  from  the  Devonian  of  Xew-York 
State  (J.  M.  Clarke). 
P.  22 7.  Balcletchie.  Deferred  to  the  Caradoc  Beds  with  doubt. 
2.  Pinnocaris  Lapvjorthi ,  Etheridge  Jun.  (p.  210).  A  similar 
form  occurs  in  the  Upper  Silurian  of  Kendal. 
Note. — The  Solenocaris  referred  to  this  locality  (Monogr.  Girvan, 
p.  207)  has  proved  to  belong  to  a  Chitonous  family  (Geol.  Mag., 
August  1885,  p.  356,  Nelminthochiton). 
P.  232.  Thrave  Glen.  Deferred  to  the  Llandovery  Beds  with  doubt. 
3.  Beyrichia  [ Primitia  ?]  comma,  Jones  (p.  219). 
1  Among  the  figures  of  Silurina  in  Barrande's  ‘  Syst.  Silur.  Boheme/  vol.  vi. 
pi.  xlvi.  etc.,  some  have  nearly  the  outline  of  Cypridina,  but  the  superficial  lines 
of  growth  and  of  ornament  sufficiently  distinguish  them  ;  thus  the  outline  of 
Silurina  complanata  closely  resembles  that  of  a  subglobose  Cypridina. 
2  Monogr.  Carbonif.  Cypridin.,  Pal.  Soc.,  pt.  i.  1874,  p.  17,  pi.  ii.  fig.  11. 
