92 PLATE XXXVI. 



an elongated pedestal and has apparently been sepa- 

 rated from its basal attachment while alive. Natural 

 size. 



Fig. 8. — One of the long slender skeleton spicula. 

 X 150 linear. 



Fig. 9. — One of the small slender spinnlate spicula 

 of the interstitial membranes. X 160 linear. 



Hymexiacidon picos, Bowerhojik. 



Vol. ii, 15. 20ti, ' Mon. Brit. Spongiadas.' 



Fig. 10. — A very fine mature specimen of the species 

 on the outer surface of half of an old bivalve shell. 

 I dredged it in Gilter Sound, near Tenby ; it is of a 

 compressed form like that of a dried fig, not ex- 

 ceeding about five eighths of an inch in thickness. 

 Natural size. 



Fig. 11. — A small specimen which has apparently 

 been based on a univalve shell which it has entirely 

 enveloped from the Island of Harris, Hebrides, by 

 Captain Thomas, R.N. Natural size. 



Fig. 12. — A specimen entirely enveloping a small 

 univalve shell from the coast of Scotlaud hj Mr. C. 

 W. Peach. Natural size. 



Fig. 13. — A spinulate, skeleton spicuhnn. X 150 

 linear. 



Fig. 14. — An acuate, skeleton spiculum. X 1 50 

 linear. 



Fig. 15. — A sub-attenuato, acuate, slender spiculum 

 of the interstitial membi-anes. X 150 linear. 



Fig. 16. — One of the minute inflato-cylindrical 

 spicula of the dermal membrane. X 150 linear. To 

 give an idea of the relative size of these spicula as 

 compared with those of the skeleton. X 150 linear. 



Fig. 17.^The same spiculum. X 530 hnear. 



