60 I'LATIS XXIXI. 



MiCKocioNA FALLAX, Bowerhwuk. 

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



Fig. 12. — Eepresents the tjq^e-specimen from the 

 Diamond Ground, off Hastings, in tlie dried condition. 

 Natural size. 



Fig. 13. — One of the long, slender, acuate, tension 

 spicula from the dermal membrane. X 250 linear. 



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



Fig. 15. — The basal portion of one of the skeleton 

 spicula. X 320 liuear, to exhibit the minuteness of 

 the s^^ination. 



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

 X 250 linear. 



MiC'COOIONA AiaiATA, Hoirryhank. 

 Vol. ii, p. 129, ' Mon. Brit. Spongiad*.' 



Fig. 17. — Represents the type-specimen from 

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

 tion and of the natiu'al size. 



Fig. 18. — A specimen of M. armatn., surrounding a 

 C'arijophi/Ui.a Srnithii from Guernsey, b}^ the Eev. A. 

 M. Norman. In the dried condition and of the 

 natural size. 



Fig. 19. — An attenuato-acuate, tension spiculum 

 from the dermal membrane. X 123 linear. 



Fig. 20. — One of the anguloid, tricurvato-acerate, 

 retentive spicula from the dermal membrane. X 

 250 linear. 



Fig. 21. — A dentato-palmatc, equi-anchorate, reten- 

 tive spiculum from the dermal membrane. X 1000 

 linear. 



Fig. 22. — A bidcntate, equi-anchorate, retentive 

 spiculum from the dermal membrane. X 1000 liuear. 



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. 



