326 
DE.  J.  S.  BOWEEBAjVK  OX  THE  AXATOiJT 
Fig.  13.  Fusiformi-eecurvo-teenate,  an  adult  spiculum  from  tlie  same  sponge  as  the 
spiculum  represented  by  fig.  12,  x260  linear:  page  295. 
P'ig.  14.  Spiculated  equiangulated  trieadiate,  from  Gh'antia  nivea^  Johxstox,  x 45 
linear:  page  295. 
Fig.  15.  Ensiform  spiculated  equiaj^gulated  trieadiate,  from  Grantia  ensata,  Bottee- 
BANK,  MS.,  xl30  linear:  page  296. 
Fig.  16.  Ensiform  spiculated  equiangulated  trieadiate,  from  Grantia  tessellata, 
Bowerbank,  ms.,  x130  linear:  page  296. 
Fig.  17.  Equiangulated  spiculated  tripod  ate,  from  Grantia  nivea,  John’ston,  x 660 
linear:  page  296. 
Fig.  18.  Equiangulated  teiradiated,  uniradiallt  spined,  from  an  undescribed  sponge. 
X 130  linear:  page  296. 
Fig.  19.  Attenuato-clavate,  incipiently  spined,  from  Hymeniaddon  davigera,  Bomee- 
BANK,  MS.,  xl30  linear:  page  296. 
Fig.  20.  Equiangulated  trieadiate,  verticillatelt  spined.  Sponge  unknown,  x 400 
linear:  page  296. 
Spicula  of  the  Membranes. — Tension  Gpicida. 
Fig.  21.  Fusiformi-acerate,  entirely  spined,  from  Johnston,  x660 
linear:  page  297. 
Fig.  22.  Fusiformi-acerate,  truncatedly  spined,  from  Spongilla  alha,  Carter.  x660 
linear : page  297. 
Fig.  23.  Mucronato-cylindrical,  from  Halichondria  incrustans,  Johnston,  x 400  Imear : 
page  297. 
Fig.  24.  Tuberculated  fusiformi-cylindrical,  from  Pachymatisma  Johnstonia,  Bower- 
bank,  X 660  linear:  page  298. 
Fig.  25.  Inflato-cylindrical,  from  Halichondria  Jicus,  Johnston,  x660  lineai-:  page 
298. 
Figs.  26,  27,  28.  Tricurvo-acerate,  from  an  undescribed  sponge  in  the  cabinet  of 
Mr.  Thomas  Ingall,  x260  linear:  page  298. 
Fig.  29.  Unicurvo-ceuciform,  from  Grantia  nivea,  Johnston,  x130  linear:  page  298. 
Fig.  30.  Falcato-acerate,  from  an  undescribed  species  of  Grantia  on  sevei'a!  species  of 
Pud  brought  from  Australia  by  Dr.  Haryey,  x130  linear-:  page  298. 
Fig.  31.  Bicurvo-acerate,  from  a small  undescribed  species  of  Grantia  fr-om  Algoa  Bay. 
X260  linear:  page  298. 
Fig.  32.  Foliato-peltate,  first  stage  of  development,  exhibiting  rudimentary  simple 
triradiate  canals,  x 260  linear:  page  299. 
Fig.  33.  Foliato-peltate,  second  stage  of  development,  x 160  linear : page  299. 
Fig.  34.  Foliato-peltate,  third  stage  of  development,  xl60  linear:  page  299. 
Fig.  35.  Foliato-peltate,  fourth  stage  of  development,  xl60  linear-:  page  299. 
Fig.  36.  Foliato-peltate,  an  adult  spiculum  fully  developed,  xl30  linearj  page  299. 
