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PLATE XXXII. 



Hymeniacidon caetjncula, Bowerbank. 



Vol. ii, p. 166, ' Mon. Brit. Spongiadai.' 



Fig. 1. — An average-sized specimen of tlie species 

 from St. Kafcherine's Cave, Tenby, from a dried 

 specimen. Of the natural size. 



Fig. 2. — One of tlie slender acuate spicula, from 

 tlie dermal membrane. X 250 linear. 



Fig. 3. — A large-sized skeleton spiculum. X 250 

 linear. 



Fig. 4. — A small-sized skeleton spiculum. X 250 

 linear. The greater portion of the skeleton spicula 

 are intermediate in size between fipfures 3 and 4. 



Hymeniacidon sanguinea, Boivcrbavh. 



Vol. ii, p. 168, ' Mon. Brit. SpongiadEe.' 



Fig. 5. — Represents a specimen of the species from 

 the Island of Bofl&n, Connemara, sent to me by the 

 Rev. Robert Hudson. It is of about the average size 

 and in the dried condition. Natural size. 



Fig. 6. — One of the slender, acuate spicula, from 

 the dermal membrane. X 250 linear. 



Figs. 7 and 8. — Two of the skeleton spicula. X 250 

 linear. The spicula vary in size in every degree 

 between the two figured ones. 



I have also received a small specimen of this species 

 from my friend Mr. 0. W. Peach, who found it in 

 Fowey Harbour in 1847. 



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