332 
ON  THE  ANATOaiT  AND  PHYSIOLOGY  OF  THE  SPONGIADH:. 
Fig.  40.  Unihamate  attenuato-clavate,  from  the  gemmule  of  Tethea  craniura,  Joha'STOX, 
x260  linear:  page  320. 
Fig.  41.  A bihamate  variety  of  a recurvo-ternate  spiculum  from  Tethea  similiinus, 
Boweebank,  ms.,  x660  linear:  page  320. 
Fig.  42.  Attenuato-recuevo-ternate,  from  Tethea  similimus.  BoTVERBA^*E;.  MS.,  x660 
linear:  page  320. 
Fig.  43.  Attenuato-poreecto-ternate,  from  the  gemmule  of  Tethea  cranium,  Joh^stox, 
Xl30  linear:  page  320. 
Spicula,  the  position  of  which  are  unknown. 
Fig.  44.  Birecurvo-quaterxate,  medially  spixed.  Sponge  unknown,  x660  linear: 
page  321. 
Fig.  46.  Tuberculated  fusiformi-cylixdrical.  Sponge  unknown,  x 150  linear-:  page 
321. 
Fig.  46.  Tuberculated  spiculum.  Sponge  unknorvn,  x260  hnear:  page  321. 
Fig.  47.  Tuberculated  spiculum.  Sponge  unknown,  x260  linear:  page  321. 
Fig.  48.  Acerate,  veeticillately  spixed,  from  a parasitical  sponge  from  Western 
Australia,  xl30  linear:  page  321. 
Fig.  49.  Spixulato-exsiform,  from  a parasitical  sponge  from  Western  Australia,  xl30 
linear:  page  322. 
Fig.  50.  Acuate,  basally  eectaxgulated.  Sponge  unknown,  xl50  linear:  page  322. 
Fig.  51.  SuBSPixuLATO-ARCUATE.  Sponge  unknown,  x260  linear:  page  322. 
