75 



PLATE XXX. 



HYMENIACIDON THOMASII, Boiverlank. 



Vol. ii, p. 155, ' Mon. Brit. Spongiadse.' 



Fig. 1. Represents the type- specimen of the sponge 

 in the dried state. Natural size. 



Fig. 2. One of the skeleton spicula. X 150 linear. 



Fig. 3. One of the slender acerate spicula of the 

 interstitial membranes. X 150 linear. 



HYMENIACIDON COCCINEA, Bowerbank* 



Vol. ii. p. 156, ' Mou. Brit. Spongiadse.' 



Fig. 4. Represents the type-specimen of the species 

 from Salcombe Bay, Devonshire, in the dried state. 

 Natural size. 



Fig. 5. A larger specimen of the species from 

 Jersey ; in the cabinet of the Rev. A. M. Norman. In 

 the dried state. Natural size. 



Fig. 6. One of the subfusiformi-acerate spicula of 

 the skeleton. X 150 linear. 



HYMENIACIDON BRETTII, Bowerbank. 



Vol. ii, p. 158, ' Mon. Brit. Spongiadse.' 



Fig. 7. The type-specimen of the species figured 

 from the dried sponge. Natural size. 



Fig. 8. One of the fusiformi-acerate, skeleton 

 spicula. X 150 linear. 



Fig. 9. A slender acerate spiculum of the dermal 

 membrane. X 150 linear. 



Since the description of the type-specimen I have 



