604  ME.  C.  SPENCE  BATE  ON  THE  DEVELOPMENT  OE  DECAPOD  CEHSTACEA. 
Fig.  7.  Maxilliped. 
Fig.  8.  Anterior  gnathopoda. 
Fig.  9.  Posterior  gnatho^oda.  9'.  Point  of  ditto,  to  show  the  position  of  the  cilia 
before  the  first  moult. 
Fig.  10  to  14.  Pereiopoda : — «,  Coxa ; h,  Basos ; c,  Ischium ; d,  Meros ; e,  Carpus ; /'  Pro- 
podos ; g,  Dactylus. 
Fig.  15  to  20.  Pleopoda. 
Fig.  21.  Telson.  21'.  Exhibits  the  terminal  process  as  folded  within  the  outer  case  be- 
fore the  first  moult.  21".  Ditto,  undergoing  change.  21'".  Ditto,  undergone 
change. 
S.  Secondary  appendage. 
T.  Principal  appendage. 
y.  Branchia. 
z.  Flabella. 
The  numbers  throughout  refer  to  the  same  parts  and  represent  the  homological  rela- 
tion of  each  to  the  segment  from  which  it  is  derived. 
The  small  letters  have  also  a similar  value  in  relation  to  each  individual  part. 
The  Roman  capital  letters  A,  B,  . . . K,  signify  the  stage. 
PLATE  XL. 
Illustrations  of  the  Development  of  Carcinus  Msenas. 
Fig.  A.  Larva  immediately  as  it  quits  the  ovum. 
Fig.  B.  Larva  after  first  moult. 
Fig.  B'.  Cephalic  region  seen  from  front. 
Fig.  B".  Cephalic  region  seen  from  above. 
PLATE  XLI. 
Fig.  C.  Larva  after  two  or  three  moults. 
Fig.  D.  Appendages  of  larva  a little  older. 
PLATE  XLII. 
Fig.  E.  Larva  after  several  moults,  seen  in  profile. 
Fig.  E'.  Ditto  ditto,  seen  dorsally. 
Fig.  E".  Carapax  seen  from  beneath.  It  has  one  eye,  one  anterior  and  one  posterior 
antenna  in  situ. 
