U2 PLATE XLV. 



figured are neither the largest nor smallest of their 

 kind, but those sizes, and the intervening ones, which 

 appear to be the most numerous in the sponge. 



Halichondeia scandens, Boiverbanh. 



Vol. ii, p. 259, ' Mon. Brit. Spougiadas.' 



Fig. 14. — Represents the type-specimen of the 

 species, in the cabinet of the Rev. A. M. Norman. 

 Natural size. 



Fig. 15. — One of the large, fusiformi-cylindrical, 

 tension spicula, from the dermal membrane. X 250 

 linear. 



Fig. 16. — A simple, bipociUated, anchorate spiculum, 

 from the dermal membrane. X 530 linear. 



Fig. 17. — One of the dentato-palmate, inequi-an- 

 chorate, retentive spicula, from the dermal membrane. 

 X 530 Unear. 



Fig. 18. — A bidentate, inequi-anchorate, retentive 

 spiculum, from the dermal membrane. X 530 linear. 



Fig. 19. — A skeleton spiculum, basally and apically 

 spined. X 250 linear. 



Fig. 20. — One of the short, stout, entirely -spined, 

 internal, defensive spicula. X 250 linear. 



Halichondria albula, Boiverhanlc. 



Vol. ii, p. 268, ' Mon. Brit. Spongiadte.' 



Fig. 21. — Represents the type-specimen which I 

 received from my late friend, Mr. Barlee. Natural 

 size. The sponge occupies the light portion of the 

 shell at a. 



Fig. 22. — One of the large, acuate, entirely and 

 profusely spined spicula, from the dermal membrane. 

 X 530 linear. 



Fig. 23. — A skeleton spiculum. X 530 linear. 

 Many of these spicula are more or less flcxuous. 



