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SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
free  part  is  a  deep  marginal  notch.  In  some  specimens  there  projects 
from  this  notch  a  long  sclerotic  process  with  a  terminal  hook  and  a 
membranous  base  (B,  IPhm).  This  process  is  called  the  "  penis  "  by 
Chopard  (1920)  ;  it  is  the  "  titillator  "  of  Wille  (1920),  the  "left 
Fig.  16. — Blattoidea:  male  genitalia  of  Blattella  gennanica  (Linnaeus). 
A,  internal  reproductive  organs,  dorsal  view.  B,  phallic  gland.  C,  ejaculatory 
duct  and  associated  structures,  with  most  of  smaller  accessory  gland  tubules 
removed  to  expose  the  seminal  vesicles.  D,  end  of  abdomen  with  penis  projected, 
ventral  view.  E,  external  genitalia  and  endophallic  pouch  in  retracted  position, 
dorsal  view. 
AcGlds,  accessory  glands;  Ape,  endophallic  apodeme;  c,  smaller  tubules  of 
accessory  glands;  d,  long  white  tubules  of  accessory  glands;  Dcj,  ductus  ejacu- 
latorius ;  Enpli,  endophallus ;  /.  sclerotic  fold  of  wall  of  right  phallic  pouch ; 
IPhm,  left  phallomere ;  mcls,  muscles  of  endophallic  apodeme ;  p,  apodeme  of 
right  phallomere ;  Pen,  penis ;  Phtr,  phallotreme ;  rPhm,  right  phallotreme ; 
SP,  pouch  of  ejaculatory  duct;  Tes,  testis;  Vd,  vas  deferens;  Vir,  virga;  Vsm, 
vesiculae  seminales ;  x-x  cut  edge  of  anterior  wall  of  genital  chamber ;  y,  right 
phallic  pouch;  z,  left  phallic  pouch. 
paramere  "  of  Walker  (1922),  or  the  left  phallomere  according  to 
the  nomenclature  here  used.  In  other  specimens,  again,  there  is  some- 
times seen  a  conical  or  slender  membranous  organ  terminating  in  a 
spine  projecting  from  the  right  above  the  genital  sternum  (fig.  16  D, 
Pen).  This  is  the  penis,  which  is  more  usually  concealed  within  the 
genital  chamber. 
