Yol.  49.] 
ANTHEACOPIEEA  AND  ANTHEACOMYA. 
273 
Remarks. — Blocks  of  clay-ironstone  crammed  with  shells  of  this 
species  were  sent  me  for  description  by  Mr.  C.  Boeder  of  Manchester, 
from  the  Middle  Coal  Measures  of  Prestolee.  They  agree  in  form 
with  those  figured  by  Salter  ( op .  supra  cit .),  and  I  have  come  to  the 
conclusion  that  the  more  transverse  forms  are  only  the  young  of 
these,  more  expanded  posteriorly  and  triangular.  The  specimens  1 
have  described  were  obtained  by  calcining  the  blocks  of  stone. 
Localities. — Middle  Coal  Measures,  Prestolee,  Manchester  :  Black- 
band,  Blaina,  South  Wales, 
Aniheacomya  caeinata,  sp.  nov.,  Wheelton  Hind.  (PI.  X.  figs.  16 
and  16  a.) 
Specific  Characters. — -Shell  transversely  elongate,  anterior  end 
almost  obsolete,  moderately  tumid,  pointed  bluntly  above  the  border, 
sloping  quickly  into  the  inferior  edge,  which  is  slightly  convex  in 
its  outline.  Posterior  part  of  shell  produced.  Xearly  §  of  the 
shell  with  a  strong  oblique  swelling  passing  downward  trom  the 
umbones  to  the  inferior  border,  at  the  junction  of  its  third  and 
posterior  fourth.  The  extremity  is  flattened,  and  gradually  com¬ 
pressed  into  the  border,  which  is  bluntly  rounded.  The  hinge¬ 
line  is  straight,  about  |  length  of  the  shell.  Umbones  very  anterior, 
tumid,  obtuse. 
Interior  unknown. 
Exterior. — Surface  covered  with  fine  striae  and  lines  of  growth, 
which,  starting  from  the  anterior  end,  become  curved  upwards,  as 
they  reach  the  oblique  swelling,  and  are  reflected  to  the  superior 
border.  The  greatest  dorso-ventral  measurement  is  at  the  posterior 
end  of  the  hinge-line.  Periostracum  wrinkled. 
Size. — Antero-posterior  measurement,  22  mm.  (^  inch);  dorso- 
ventral,  8  mm.  inch) ;  lateral,  8  mm.  inch). 
Remarks. — I  know  of  only  two  specimens  of  this  form,  one  from 
the  Strickland  Collection  of  the  University  of  Cambridge,  and  one 
from  the  Middle  Coal  Measures  of  Prestolee,  Manchester,  kindly 
lent  me  by  Mr,  C.  Boeder.  Its  distinctive  characteristics  are  the 
strong  oblique  swelling,  transverse  form,  short  anterior  end,  and 
rounded  posterior  extremity.  It  most  closely  resembles  Anthra- 
comya  lauceolata  (see  p.  267),  which  has  a  similar  posterior  border, 
but  does  not  possess  so  stout  an  anterior  end,  nor  so  strong  an 
oblique  tumidity. 
Localities. — Middle  Coal  Measures,  Manchester ;  South  Wales 
Coalfield,  Merthyr  Tydvil,— March  15th,  1893.] 
[Note. — I  find  that  Eichwald,  in  4  Lethaea  Bossica  ’  (Partie 
ancienne),  pp.  976-978,  and  pis.  xxxviii.-xxxix.,  describes  and 
figures  under  Modiolopsis  several  species  from  the  Coal  Measures 
of  Bussia  which  are  evidently  Anthracomya :  they  are  Mocl.  con- 
spicua ,  M.  tenerat  M.  tenuissima  (fig.  in  4  Urwelt  Busslands,’  Heft  h 
p.  100,  pi.  iv.  fig,  1),  and  M.  Pallasii.  For  the  last-named,  and 
for  M.  Teplofi,  he  quotes  De  Yerneuil,  4  Paleont.  de  la  Bussie/ 
pp.  316,  318,  pi.  xix.  figs.  16,  17.— April  19th,  1893.] 
Q.J.G.S.  Bo.  194.  t 
