60 PLATE XX 11 1. 



MIUROCIONA FALLAX, Bowerbank. 



Vol. ii, p. 128, ' Mon. Brit. Spongiadse.' 



Fig. 12. Represents the type-specimen from the 

 Diamond Ground, off Hastings, in the dried condition. 



Natural size. 



JV. 13. One of the long, slender, acuate, tension 

 spicula from the dermal membrane. X 250 linear. 

 L Fig. 14. A skeleton spiculum. X 250 linear. 



Fig 15 The basal portion of one of the skeleton 

 spicula. X 320 linear, to exhibit the minuteness of 

 the spinatioii. 



Fig. 16. One of the internal, defensive spicula. 



X 250 linear. 



MICEOOIONA ARMATA, Bowerban&. 



Vol. ii, p. 129, ' Mon. Brit. Spongiadse.' 



Fig. 17. Represents the type-specimen from 

 Strangford Lough, by Dr. Dickie, in the dried condi- 

 tion and of the natural size. 



Fio*. 18. A specimen of If. armata., surrounding a 

 Caryophyllia Smithii from Guernsey, by the Rev. A. 

 M. Norman. In the dried condition aod of the 



natural size. 



Fio-. 19. An attenuato-acuate, tension spiculum 

 from the dermal membrane. X 123 linear. 



pity. 20. One of the anguloid, tricurvato-acerate, 

 retentive spicula from the dermal membrane. X 

 250 linear. 



Fig. 21. A dentate-palmate, equi-anchorate, reten- 

 tive spiculum from the dermal membrane. X 1000 

 linear. 



Fig. 22. A bidentate, equi-anchorate, retentive 

 spiculum from the dermal membrane. X 1000 linear. 



Fig. 23. An attenuato-acuate, basally-spined, skele- 

 ton spiculum. X 123 linear. 



Fig. 24. An attenuato-acuate, entirely spined, 

 internal, defensive spiculum. X 123 linear. 



