330 
DE.  J.  S.  BOWEEBA^sK  ON  THE  ANATOMY 
PLATE  XXVI. 
Fig.  1.  Spinulo-teipuecated  hexeadiate  stellate,  hom  Dactylocalyx  jpumicea,  Stutch- 
BUEY,  a perfect  spiculum,  xl060  linear:  page  311. 
Fig.  2.  Spinulo-quadeifuecate  hexeadiate  stellate,  from  a species  of  Dactylocalyx. 
Stutchbuey,  in  the  Cabinet  of  Mr.  TnoiiAS  Ixgall,  x1060  linear:  page  312. 
Fig.  3.  Floeicomo-hexeadiate,  from  Euplectella  aspergillum^  Oytex,  in  the  Cabinet  of 
Mr.  Hugh  Cumixg,  showing  four  out  of  the  six  primary  radii,  and  the  mode 
of  the  attachment  of  the  secondary  ones  to  their  distal  terminations,  X 660 
linear:  page  312. 
Fig.  4.  Floeicomo-hexeadiate,  from  the  same  sponge  as  fig.  3,  exhibiting  a front  \iew 
of  the  congregated  expanded  apices  of  one  of  the  groups  of  the  secondary 
radii,  and  the  contour  of  a perfect  spiculum,  x 660  linear : page  312. 
Fig.  5.  CoEONATO-HEXEADiATE  STELLATE,  from  a species  of  Euplectella  in  the  Museum  of 
the  Jardin  des  Plantes,  Paris,  xl060  linear:  page  312. 
Fig.  6.  PociLLATED  HEXEADIATE  STELLATE.  Sponge  Unknown,  xl060  linear-:  page  313. 
Fig.  7.  Attenuato-eectangulated  teieadiate,  apically  spixed,  from  Euplectella  asper- 
gillum, X 90  linear:  page  313. 
Figs.  8 and  9.  Spiculated  biteenate,  from  a siliceo-fihrous  sponge  hr  the  possession  of 
Dr.  A.  Faeee.  Fig.  8 x90  linear;  fig.  9 xl30  linear:  page  313. 
Fig.  10.  Multiangulated  cylindeical,  from  Qeodia  carinata,  Boweebaxk,  MS.,  x 660 
linear:  page  314. 
Spicula  of  the  Gemmules. 
Fig.  11.  Aceeate,  from  Spongilla  Carteri,  Boweebaxk,  MS.,  xl30  linear:  page  315. 
Fig.  12.  Aceeate,  from  Spongilla  Brownii,  Boweebaxk,  MS.,  xl30  lirrear:  page  315. 
Fig.  13.  SuBAECUATE  ACEEATE,  from  Spougilla  lacustris,  Johnstox,  x 660  linear:  page 
315. 
Fig.  14.  Fusipoemi-aceeate,  entirely  spined,  spines  cylindrical,  from  Spongilla  Batei, 
Boweebaxk,  ms.,  x660  linear:  page  315. 
Fig.  15.  Aceeate,  extieely  spined,  spines  conical,  from  Spongilla  cinerea,  Caeteb, 
X 660  linear:  page  315. 
Fig.  16.  Cylindeical,  incipiently  spined,  from  Spongilla  gregarea,  Boweebaxk,  MS.. 
x400  linear:  page  316. 
Fig.  17.  Cylindeical,  entieely  and  eecuevedly  spinous:  spines  of  the  middle  cylin- 
drical, those  of  the  terminations  conical  and  recurved,  from  Spongilla  cinerea, 
Caetee,  x400  linear:  page  316. 
Fig.  18.  First  stage  of  development  of  a birotulate  spiculum  from  the  gemmule  of 
Spongilla plumosa,  Caetee,  x660  linear:  page  317. 
Fig.  19.  Second  stage  of  development  of  a birotulate  spiculum  from  the  gemmule  of 
Spongilla plumosa,  Caetee,  x660  linear:  page  317. 
