263 



PLATE LXXXII. 



ISODICTYA LURIDA, Bowerbank. 



Yol. ii, p. 336, 'Mon. Brit. SpongiadfB.' 



Fig. 1. This specimen is a very much finer and more 

 characteristic one than the type-specimen as quoted 

 above. 



DESMACIDON COPIOSA, Bowerbank. 



Fig. 2. Represents the type-specimen of the species 

 in the cabinet of the Rev. A. M. Norman. Natural 

 size. 



Fig. 3. One of the large sub-clavate, acuate skeleton 

 spicula. X 250 linear. This figure also represents 

 the spicula of the dermal network. 



Fig. 4. A tricurvate, acerate, tension spiculum from 

 the dermal membrane. X 530 linear. 



Fig. 5. One of the large contort, bihamate, retentive 

 spicula of the dermal membrane. X 530 linear. 



Fig. 6. A dendato-inequi-palmate-anchorate, reten- 

 tive spiculum from the dermal membrane. X 530 

 linear. 



Fig. 7. One of the bidentate-inequi-anchorate 

 spicula from the dermal membrane. X 530 linear. 



Fig. 8. One of the slender subclavate, fusiformi- 

 acuate tension spicula from the interstitial membranes. 

 X 250 linear. 



DESMACIDON CAVERNULA, Bowerbank. 



Fig. 9. Represents the type-specimen in the dried 

 state. Natural size. 



