87 



PLATE XXXIV. 



HYMENIAOIDON PERLEVIS, Bowerbanfc. 



Vol. ii, p. 179, ' Mon. Brit. Spongiadse.' 



Fig. 1. Represents the specimen of the species 

 presented to me by the ]ate Mrs. Griffiths, who ob- 

 tained it from a Torbay fisherman. Natural size. 



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

 linear. 



HYMENIACIDON CRUSTULA, Bowerbank. 



Vol. ii, p. 185, ' Mon. Brit. Spongiadse.' 



Fig. 3. Represents the largest and finest specimen 

 of the species that I have seen, dredged on the 

 Diamond Ground, off Hastings. It exhibits the deep 

 depression in which numerous oscula are congregated. 

 Natural size. 



Fig. 4. One of the large fusiformi-acuate skeleton 

 spicula. X 150 linear. 



Fig. 5. A slender fusiformi-acuate, tension spiculum. 

 X 150 linear. 



Fig. 6. One of the fusiformi-acuate spicula from 

 the dermal crust of the sponge. X 150 linear. 



HYMENIACIDON AUEEA, Bowerbank. 



Vol. ii, p. 181, ' Mon. Brit. Spongiadse.' 



Fig. 7. Represents one of the specimens which I 

 obtained at Tenby, covering the greater portion of the 

 surface of the shell and its parasites. Natural size. 



