208 PLATE LXXIV. 



retentive spicula from tlie dermal membrane. X 530 

 linear. 



Fig. 13. — A dentato-palmate, inequi-anchorate spicu- 

 lum from the dermal membrane. X530 linear. 



Haliohondria ambigua, Bowerbank. 



Fig. 14. — Eepresentsthe type-specimen in the cabinet 

 of the Rev. A. M. Norman. Natural size. 



Fig. 16. — One of the acerate skeleton spicula. 

 X 123 linear. 



Hymeniacidon tbgetecula, Boiverban/c. 



Fig. 16. — Represents the type-specimen in the 

 cabinet of the Rev. A. M. Norman. Natural size. 



Fig. 17. — One of the skeleton spicula. X 250 

 linear. 



Halichondria faloula, Bowerhank. 

 Plate LXXIY. 



Sponge massive, sessile ; surface vmeven, minutely 

 spinous and reticulated. Oscula simple, dispersed. 

 Pores inconspicuous ; dermal membrane pellucid, fur- 

 nished with a stout, irregular, polyspiculous net- 

 work : pores dispersed amidst the areas. Skeleton. — 

 Rate polyspiculous, very irregular and diffused ; spicula 

 fusiformi-acuate, slender and long. Interstitial mem- 

 branes. Tension spicula same as those of the skeleton, 

 but smaller, few in number. Retentive spicula, 

 trenchant contort bihamate, stout and large, very few 

 in number. Gemmules membranous, aspiculous. 



Colour. — In the dried state, cream white. 



Habitat. — Shetland ; Rev. A. M. Norman. 



Examined. — In tho dried state. 



The general appearance of this sponge is much like 



