ins.  HANCOCK  ON  THE  OEG-ANIZATION  OF  THE  BEACHIOPODA.  8G5 
Fig.  9.  A fibre  and  a few  of  the  fibrillse  of  the  same,  greatly  magnified : — a,  fibre ; 
fibrillae. 
Fig.  10.  Transverse  section  of  peduncle  of  lAngiila  anatina : — a,  central  channel ; h,  mus- 
cular cylinder,  exhibiting  radiating  divisions ; c,  external  horny  sheath. 
Fig.  11.  (Esophageal  ganglia  of  IF!  : — «,  central  or  anterior  ganglion;  lateral 
or  posterior  ganglia ; c,  labial  ditto ; d,  commissure  completing  oesophageal 
collar ; e,  a pair  of  minute  ganglia  giving  filaments  apparently  to  oesophagus ; 
f,  dorsal  pallial  nerve ; g,  g,  g,  nerves  supplying  anterior  wall  of  perivisceral 
chamber ; h,  two  nerves  supplying  dorsal  adjustor  muscles ; i,  i,  ventral  pallial 
nerves ; i'  branches  of  ditto ; j,  peduncular  ditto ; Ic,  brachial  nerves. 
Fig.  12.  (Esophageal  ganglia  of  W.  cranium,  seen  from  above;  the  letters  correspond  to 
those  of  fig.  11 : — I,  bundle  of  muscular  fibres.  The  brachial  nerves  are  not 
displayed. 
Fig.  13.  View  of  the  under  side  of  the  same  ganglia:  letters  as  in  fig.  11. 
Fig.  14.  View  of  the  loop  of  the  dorsal  pallial  nerve: — «,  anterior  occlusor ; h,  posterior- 
ditto  ; c,  pallial  nerve ; d,  loop  of  ditto ; e,  e,  branches  supplying  muscles ; 
f,  f,  ditto  supplying  pallial  lobe. 
Fig.  15.  The  same,  more  enlarged: — a,  posterior  occlusor ; h,  loop ; c,  c,  c,  c,  nerves  sup- 
plying muscle ; d,  pallial  nerve. 
PLATE  LXIII. 
Fig.  1 . Diagram  exhibiting  central  portion  of  vascular  system  of  W.  australis : — a,  por- 
tion of  dorsal  pallial  lobe ; b,  ventral  ditto  ; c,  c,  anterior  wall  of  perivisceral 
chamber;  d,  d,  areas  of  attachment  of  anterior  and  posterior  occlusors; 
e,  ditto,  of  ventral  extremities  of  ditto ; f,  f,  ditto  of  divaricators ; g,  g,  ditto 
of  ventral  adjustors;  7i,  A,  ditto  of  accessory  divaricators;  ^,  7,  peduncular 
muscle ; j,  peduncular  capsule ; Jc,  peduncle ; I,  alimentary  tube ; m,  m,  gastro- 
parietal  bands ; n,  n,  ilio-parietal  bands ; o,  orifice  leading  into  oviduct ; 
p,  heart ; q,  branchio-systemic  vein ; r,  aorta ; s,  s,  dorsal  pallial  or  genital 
arteries ; f,  t,  ventral  ditto ; u,  u,  u,  u,  accessory  pulsatile  vesicles. 
Fig.  2.  Diagram  of  the  nervous  system  of  the  same ; the  letters  up  to  k correspond  to 
those  of  fig.  1 : — I,  I,  I,  genitalia ; m,  root  of  oesophagus ; n,  anterior  or  central 
oesophageal  ganglion ; o,  o,  posterior  or  lateral  ganglia ; p,  collar ; q,  q,  labial 
ganglia ; r,  r,  dorsal  pallial  nerves ; s,  s,  s,  branches  of  ditto  to  pallial  lobe ; 
t,  loop  of  pallial  neiwe,  giving  off  numerous  minute  twigs  to  occlusor  muscles ; 
u,  u,  u,  ventral  pallial  nerves ; v,  v,  posterior  or  peduncular  nerves ; w,  pedun- 
cular branches  of  ditto ; a,  capsular  branches  of  ditto ; g,  parietal  branch  of 
ditto ; z,  nerves  to  anterior  wall  of  perivisceral  chamber ; z',  z\  two  nerves  to 
dorsal  adjustor  muscles. 
5 u 2 
