I'LATE XXXni. 



Fig. 32. — A skeleton spiculum of the normal form 

 and of tlie largest size. X 1 2.'.] linear. 



Fig. 33. — A smaller sized skeleton spiculum, exliil>it- 

 ing one of tlie very common forms of contorsion, 

 whick prevails among tlie smaller skeleton spicula. 

 123 linear. 



Fig. 34. — Represents a small portion of the dermal 

 membrane witli its spicula in sitil witk loosely fascicu- 

 lated, minute, acuate, tension, spicula, and tlie large 

 and small bikamate, retentive spicula, irregularly 

 dispersed, x 320 linear. 



Hymeniaoidon fallax, IJoincrhnnJi. 



Vol. ii, p. 177, ' Mou. Brit. Spongiiuloj.' 



Fig, 15. — Represents tlie type specimen of tlic 

 species wliick I received from Mrs. Griffitks. Natural 

 size. 



Fig. IG. — One of tke spicula of tke dermal mem- 

 brane. X 150 linear. 



Fig. 17. — ^A skeleton spiculum. X 150 linear. 



Fig. IS. — One of tke slender, flexuous, tension spi- 

 cula of tke interstitial membranes. X 150 linear. 



Hyjieniacidon VmiDANS, J'oinrrhaiih. 

 Vol. ii, p. 178, 'Mon. Brit. SpongiadEU.' 



Fig. 19. — Represents tke type-specimen of tke 

 species in tke Cabinet of tke Rev. A. M. Norman. 

 Natural size. 



Fig. 20. — A specimen of tke same species and from 

 tke same locality, for wkick I am indebted to Mr. 

 Norman. Natural size. 



Since tke description of tke type-specimen in \o\. ii, 

 p. 178, I liave kad tke opportunity of examining 

 several otker specimens of tke species. Tkey appear 

 to vary to a very considerable extent in size, form, and 



