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PLATE LXXXIII. 



MICEOCIONA JECUSCULUM, Bowerbank. 



Figs. 1 and 2. Represent the type-specimens from 

 the Island of Harris, in the dried state. Natural 

 size. 



Fig. 3. One of the slender acuate spicula from the 

 dermal membrane. X 250 linear. This figure will 

 also represent the external defensive spicula. 



Fig. 4. One of the stout angulated, equi-anchorate, 

 retentive spicula from the dermal membrane. X 530 

 linear. 



Fig. 5. An attenuato-acuate basally spined skeleton 

 spiculum. X 250 linear. 



Fig. 6. An attenuato-acuate, entirely spined, in- 

 ternal defensive spiculum. X 250 linear. 



MIOEOCIONA FEAUDATOE, Bowerbank. 



Fig. 7. Represents the type-specimen in the dried 

 state. Natural size. 



Fig. 8. One of the skeleton spicula. X 250 

 linear. This figure will also represent the tension 

 spicula of the dermal membrane. 



Fig. 9. An attenuato-acuate, internal defensive 

 spiculum. X 250 linear. 



Figs. 10 and 11. Two of the bidentate, equi-an- 

 chorate, retentive spicula from the dermal membrane. 

 X 530 linear. 



CHALINA INOENATA, 'Bowerbank. 



Fig. 12. Represents the type-specimen in the dried 

 state. Natural size, 



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